SEPA
EPA/600/R-10/170
November 2010
Background Information for the Leaching Environmental
Assessment Framework (LEAF) Test Methods
Leaching Environmental Assessment Framework
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EPA-600/R-10/170
November 2010
Background Information for the Leaching Environmental
Assessment Framework (LEAF) Test Methods
Andrew C. Garrabrants1, David S. Kosson1, Hans A. van der Sloot2,
Florence Sanchez1, Ole Hjelmar3
1 Vanderbilt University
Department of Civil and Environmental Engineering
Nashville, TN
2 Energy Research Centre of the Netherlands
Environmental Risk Assessment Group
Petten, the Netherlands
and
Van der Sloot Consultancy
Langedijk, the Netherlands
3DHI
Horsholm, Denmark
Category III /Applied Research
Contract No. EP-C-09-027
Work Assignment No. 1-7
Prepared for:
Susan A. Thorneloe
U.S. Environmental Protection Agency
Office of Research and Development
National Risk Management Research Laboratory
Air Pollution Prevention and Control Division
Research Triangle Park, NC 27711
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Foreword
The U.S. Environmental Protection Agency (EPA) is charged by Congress with protecting
the Nation's land, air, and water resources. Under a mandate of national environmental laws,
the Agency strives to formulate and implement actions leading to a compatible balance
between human activities and the ability of natural systems to support and nurture life. To
meet this mandate, EPA's research program is providing data and technical support for
solving environmental problems today and building a science knowledge base necessary to
manage our ecological resources wisely, understand how pollutants affect our health, and
prevent or reduce environmental risks in the future.
The National Risk Management Research Laboratory (NRMRL) is the Agency's center for
investigation of technological and management approaches for preventing and reducing risks
from pollution that threaten human health and the environment. The focus of the
Laboratory's research program is on methods and their cost-effectiveness for prevention and
control of pollution to air, land, water, and subsurface resources; protection of water quality
in public water systems; remediation of contaminated sites, sediments, and ground water;
prevention and control of indoor air pollution; and restoration of ecosystems. NRMRL
collaborates with both public and private sector partners to foster technologies that reduce the
cost of compliance and to anticipate emerging problems. NRMRL's research provides
solutions to environmental problems by: developing and promoting technologies that protect
and improve the environment; advancing scientific and engineering information to support
regulatory and policy decisions; and providing the technical support and information transfer
to ensure implementation of environmental regulations and strategies at the national, state,
and community levels.
This publication has been produced as part of the Laboratory's strategic long-term research
plan. It is published and made available by EPA's Office of Research and Development to
assist the user community and to link researchers with their clients.
Sally Gutierrez, Director
National Risk Management Research Laboratory
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ACKNOWLEDGEMENTS
The information presented in this document is based on the collaborative research of
Vanderbilt University, the Energy Research Centre of the Netherlands, DHI (Demark), U.S.
EPA's Office of Research and Development and Office of Resource Conservation and
Recovery with additional support provided by ARCADIS-US. The authors thank P. Kariher,
R. Delapp, L.H. Turner and P. Seignette for analytical and data management support, and M.
Baldwin, G. Helms, and S. Thorneloe for guidance and significant contributions to the
research reported in this documented.
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ABSTRACT
The U.S. Environmental Protection Agency Office of Resource Conservation and Recovery
has initiated the review and validation process for four leaching tests under consideration for
inclusion into SW-846:
Method 1313 "Liquid-Solid Partitioning as a Function of Extract pH for Constituents in
Solid Materials using a Parallel Batch Extraction Procedure"
Method 1314 "Liquid-Solid Partitioning as a Function of Li quid-Solid Ratio for
Constituents in Solid Materials using an Up-flow Percolation Column Procedure"
Method 1315 "Mass Transfer Rates of Constituents in Monolithic or Compacted
Granular Materials using a Semi-dynamic Tank Leaching Procedure"
Method 1316 "Liquid-Solid Partitioning as a Function of Li quid-Solid Ratio for
Constituents in Solid Materials using a Parallel Batch Extraction Procedure"
Method identification numbers are subject to change.
These protocols are derived from published leaching methods contained in the Leaching
Environmental Assessment Framework (LEAF), an integrated set of testing methods, data
management tools, and report support utilities that can be used to support a wide range of
environmental management decisions. The methods comprise a suite of available leaching
tests, including batch, column and tank tests, which may be interpreted individually or
integrated to provide characteristic leaching behavior of a solid material over a range of
potential release scenarios. LEAF also includes tools for visualizing leaching data and
significantly facilitating data management through the LeachXS Lite™ expert leaching
system software program.
LEAF represents a considerable shift in leaching assessment methodology from current
approaches which are typically based on single-point pH tests and not necessarily reflective
of management conditions. Thus, this document provides the required background necessary
to understand the development, application, and use of these four test methods. The
document includes sections on an overview of the leaching process, selection of test
parameters, and estimates of the time, material and costs required.
Subsequent reports in this series will focus on (i) the inter-laboratory validation of the LEAF
test methods, (ii) the relationship between LEAF testing results and field leaching
observations, and (iii) applications of the LEAF testing approach for evaluating use and
disposal options of coal combustion residues.
in
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ABBREVIATIONS
CEN European Committee for Standardization
COPC Constituent of Potential Concern
DOC Dissolve Organic Carbon
EC Electrical Conductivity [mS/cm]
ECN Energy research Centre of the Netherlands
EPA United States Environmental Protection Agency
FNU Formazin Nephelometric Unit
ISO International Standardization Organization
LEAF Leaching Environmental Assessment Framework
L/S Liquid-to-Solid Ratio [mL/g, dry mass basis]
L/A Liquid-to-Surface Area Ratio [mL/cm2, geometric surface area basis]
LSP Liquid-Solid Partitioning
MC Moisture Content [g water/g wet mass basis]
ORP Oxidation/Reduction Potential [mV]
PAH Polycyclic Aromatic Hydrocarbon
pD Diffusivity [m2/s] in terms of the negative logarithm (-Iog[m2/s])
POM Particulate Organic Matter
PTFE Polytetrafloroethylene
RCF Relative Centrifugal Force
SAB Science Advisory Board
SC Solids Content
TCLP Toxicity Characteristic Leaching Procedure
TOC Total Organic Carbon
IV
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TABLE OF CONTENTS
Acknowledgements ii
Abstract iii
Abbreviations iv
Table of Contents v
List of Figures viii
List of Tables ix
1 Introduction 1
2 Leaching overview 2
3 Leaching Assessment Framework 5
3.1 Leaching Tests 6
3.1.1 Influence of pH on Equilibrium 7
3.1.2 Influence of Liquid-to-Solid Ratio on Equilibrium 7
3.1.3 Influence of Mass Transfer Rates 8
4 Method Summaries and Justification of Test Parameters 8
4.1 Preliminary Version of Method 1313 9
4.1.1 Method Summary 9
4.1.2 Constituents of Potential Concern 10
4.1.3 Target pH Values 10
4.1.4 Eluent Composition 11
4.1.5 Minimum Dry Mass Equivalent 12
4.1.6 Particle Size, Li quid-To-Solid Ratio and Contact Time 13
4.1.7 Temperature 18
4.1.8 Agitation 18
4.1.9 Filtration 18
4.2 Preliminary Version of Method 1314 19
4.2.1 Method Summary 19
4.2.2 Particle Size 19
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4.2.3 Constituents of Potential Concern 20
4.2.4 Eluent Composition 21
4.2.5 Minimum Column Dimensions 21
4.2.6 Solids Packing 21
4.2.7 Sand Layers 21
4.2.8 Pre-Equilibration 22
4.2.9 Flow Rate 22
4.2.10 Temperature 23
4.2.11 Filtration and Centrifugation 23
4.2.12 Eluate Collection and Compositing for Analytical Samples 23
4.3 Preliminary Version of Method 1315 25
4.3.1 Method Summary 25
4.3.2 Constituents of Potential Concern 25
4.3.3 Sample Preparation and Geometry 26
4.3.4 Eluent Composition 27
4.3.5 Liquid-To-Surface Area Ratio 28
4.3.6 Tank-Sample Geometry 28
4.3.7 Temperature 29
4.3.8 Eluent Exchange Sequence 29
4.3.9 Filtration 32
4.4 Preliminary Version of Method 1316 33
4.4.1 Method Summary 33
4.4.2 Constituents of Potential Concern 33
4.4.3 Eluent Composition 33
4.4.4 Minimum Dry Mass Equivalent 34
4.4.5 Specified Liquid-To-Solid Ratios 35
4.4.6 Particle Size, Li quid-To-Solid Ratio, and Contact Time 35
4.4.7 Temperature 41
4.4.8 Agitation 41
4.4.9 Filtration 41
VI
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5 Estimates of Laboratory Processing Time, Material Requirements and
Supply/Equipment Costs 44
5.1 Labor/Processing Time 44
5.2 Material Requirements 52
5.3 Supplies and Equipment 52
6 References 54
Appendix A. Preliminary Version of Method 1313
Appendix B. Preliminary Version of Method 1314
Appendix C. Preliminary Version of Method 1315
Appendix D. Preliminary Version of Method 1316
Appendix E. Details of Time, Materials, and Cost Estimates by Method
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LIST OF FIGURES
Figure 1. Internal and external factors influencing the leaching process (modified from
Garrabrants andKosson, 2005) 4
Figure 2. Contact time required for a species with an observed diffusivity of 10"13 m2/s to
reach 90% of equilibrium (Mt/M_ =0.9) based on mass transport as functions of particle
diameter and fractional solubility (M_/MO )• Figure modified from Garrabrants, 1997 16
Figure 3. Contact time required for a particle of 0.3 mm diameter to reach 90% of
equilibrium (MJM^ =0.9) as function of diffusivity and fractional solubility (M^/M,, ).
Figure modified from Garrabrants, 1997 17
Figure 4. Evaluation of depth of depletion C(x,t)/C0=0.8 as a function of diffusion
coefficient (pD is the negative logarithm of the diffusion coefficient) 27
Figure 5. Hypothetical internal mass flux assuming the exchange intervals in the tank leach
test were long enough to results in equilibrium between solid and bulk liquid phases: (a)
common test methods and (b) Method 1315 31
Figure 6. Contact time required for a species with an observed diffusivity of 10"13 m2/s to
reach 90% of equilibrium (Mt/Mx =0.9) based on mass transport as functions of particle
diameter and fractional solubility (M^/M,, ). Figure modified from Garrabrants, 1997 39
Figure 7. Contact time required for a particle of 0.3 mm diameter to reach 90% of
equilibrium (MJM^ =0.9) as function of diffusivity and fractional solubility (M^/M,, ).
Figure modified from Garrabrants, 1997 40
Figure 8. Gantt Style Chart of A Typical Method 1313 Processing Schedule 46
Figure 9. Gantt Style Chart of a Typical Method 1314 Processing Schedule 48
Figure 10. Gantt Style Chart of a Typical Method 1315 Processing Schedule 49
Figure 11. Gantt Style Chart of a Typical Method 1316 Processing Schedule 51
Vlll
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LIST OF TABLES
Table 1. Rationale for Method 1313 Final pH Targets 10
Table 2. Extraction parameters as function of maximum particle size 17
Table 3. Suggested Solid Amounts for Method 1316 35
Table 4. Extraction Parameters as Function of Maximum Particle Size 41
Table 5. Comparison of Test Specifications for Preliminary Versions of Methods 1313,
1314, 1315, and 1316 42
Table 6. Summary of Estimates for Labor Time and Total Processing Time 44
Table 7. Summary of Solid Materials Required for Test Methods 52
Table 8. Summary of Estimated Supply and Equipment Costs (as of July 2010) 53
IX
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1 INTRODUCTION
The U.S. Environmental Protection Agency (U.S. EPA) Office of Resource Conservation and
Recovery has initiated the review and validation process for four leaching tests under
consideration for inclusion in its analytical chemistry guidance, SW-846.1 These protocols
are derived from published leaching methods (Kosson et al. 2002) and international standards
in various states of development and validation on wastes (CEN/TS 14405 2004; CEN/TS
14429 2005; CEN/TS 14997 2005; CEN/TS 15863 2009), construction products (CEN/TS-2
2009; CEN/TS-3 2009), and soils (ISO/TS 21268-3 2007; ISO/TS 21268-4 2007; ISO/DIS
12782 parts 1-5 2010) with further collaborative development between Vanderbilt
University, the Energy research Centre of the Netherlands (ECN) and DHI in Denmark.
The four test methods supported in this document provide the required materials leaching
information for the Leaching Environmental Assessment Framework (LEAF). These
methods have been used as the basis for evaluation of process variables in the leaching of
coal combustion residues (Sanchez et al. 2006; Sanchez et al. 2008; Kosson et al. 2009;
Thorneloe et al. 2010); however, broader application of these test methods can be used to
estimate constituent leaching from a wide range of solid materials in the context of disposal,
beneficial use in construction applications, and evaluation of treatment effectiveness.
LEAF is an integrated set of testing methods, data management and visualization tools, and
report support utilities that can be used to support a wide range of environmental
management decisions. Within the framework, testing characterizes the leaching behavior of
a material under equilibrium and dynamic conditions through the use of a suite of four broad-
based test methods including batch, column and tank tests. The results of these tests may be
interpreted individually or integrated to provide characteristic leaching behavior of a solid
material over a range of potential release scenarios. The methods are applicable to a wide
range of solid materials, including combustion residues, soils, sediments, construction
materials, industrial process residues, for estimation of constituent release, with a focus to
date on inorganics, in the context of disposal, beneficial use in construction applications, and
evaluation of treatment effectiveness, and remediation. Data management, comparison of
test results to previously characterized materials and report output support is greatly
facilitated by the LeachXS Lite™ expert leaching system software program.2
1 These methods have not been incorporated into, nor endorsed by, SW-846 to date but are in the review and
evaluation process.
2 The development of LeachXS™ Lite is the result of collaboration between EPA, Vanderbilt University, the
Energy research Centre of the Netherlands and DHI (Denmark). The LeachXS Lite program, LEAF test
methods and data management templates are available free of charge at www. vanderbilt. edu/leaching.
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Due to the shift in leaching assessment methodology that these methods represent, this
document is intended to provide the background necessary to understand the development
basis for the four preliminary versions of methods under consideration for adoption into SW-
846. The document includes sections on the selection of test parameters and estimates of the
time, materials and costs associated with conducting a full characterization of a solid
material.
Preliminary versions of the methods are provided in separate appendices as follows:
Appendix A -Method 1313 "Liquid-Solid Partitioning as a Function of Extract pH for
Constituents in Solid Materials using a Parallel Batch Extraction Procedure"
Appendix B -Method 1314 "Liquid-Solid Partitioning as a Function of Liquid-Solid
Ratio for Constituents in Solid Materials using an Up-flow Percolation Column
Procedure"
Appendix C -Method 1315 "Mass Transfer Rates of Constituents in Monolithic or
Compacted Granular Materials using a Semi-dynamic Tank Leaching Procedure"
Appendix D -Method 1316 "Liquid-Solid Partitioning as a Function of Liquid-Solid
Ratio for Constituents in Solid Materials using a Parallel Batch Extraction
Procedure"
* Method identification numbers are subject to change.
Each test method includes an optional Excel® template for data collection and data transfer
into LeachXS Lite.
This report is the first in a series documenting the development, validation and
implementation of the four LEAF leaching test methods for providing a source term for the
next generation of environmental assessment methodologies. Subsequent reports will focus
on (i) the inter-laboratory validation of the LEAF test methods, (ii) the relationship between
LEAF testing results and field leaching observations, and (iii) applications of the LEAF
testing approach for evaluating use and disposal options of coal combustion residues.
2 LEACHING OVERVIEW
Leaching in an environmental context is the process of constituent transfer from a solid
material to a contacting liquid or aqueous phase. The release of constituents is governed by a
combination of chemical processes and mass transfer mechanisms based on the chemical
composition and physical properties of the solid material along with the pH, redox and
composition (i.e., dissolved constituents) of the contacting liquid. Constituents of potential
concern (COPCs) may include major mineral components, highly soluble salts, and
environmental contaminants. In general, the term "teachability" is used to describe either the
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extent of leaching or time-dependence of release. In environmental applications, leaching
represents the source term for release of potentially hazardous substances. Additionally,
teachability also can provide an indication of material durability based on the dissolution and
transport of the constituents that comprise the solid matrix.
Figure 1 shows the internal and external factors that influence the extent and rate of leaching
in a generic release scenario (Garrabrants and Kosson 2005). Transport of constituents
within the material is controlled by physical parameters such as porosity and permeability as
well as the mass transport characteristics and equilibrium between the pore solution and solid
mineral phases. Although Figure 1 depicts the influences on the leaching behavior of a
monolithic product, the same basic principles apply to finer-grained materials in which
groundwater contact and leaching occur according to a percolation model.
Equilibrium in the pore solution is determined by the pH of the pore water (primarily for
inorganic species), the available content of the constituent in the material, and a series of
chemical reactions (e.g., sorption/desorption, precipitation/dissolution, complexation) that are
also influenced by redox potential and ionic strength. For many cases, the kinetics of these
chemical processes are fast relative to the rate of mass transport (Dijkstra et al. 2006).
Therefore, the assumption of local equilibrium is a reasonable approximation of leaching in
granular materials or the pore concentration within the core of a monolithic material.
Typically, equilibrium, or liquid-solid partitioning (LSP), is determined on the basis of
constituent concentrations as a function of pH or liquid-to-solid ratio; however, equilibrium
data may also be reported in terms of the mass of constituent release per unit mass of solid
material. The mass transport of species through the pore structure to the bulk solid-liquid
interface often is controlled by a combination of local equilibrium and diffusion properties.
The rate of mass transport may be reported as mass release per unit surface area of bulk
interface with respect to time. Characterization of equilibrium and mass transport properties
as leaching parameters provides a fundamental behavioral pattern of the solid material
regardless of the release scenario.
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Environmental
Attack
Moisture H2°
Transport ^.
Hydro! ogical
Conditions
I Infiltration Rate
GroundwaterFlow
Physical Parameters
Particle size
Permeability
Porosity
Geometry
Mass Transport
Diffusivity
Local Equilibrium
SurfaceArea
Temperature
Cracking
Equilibrium
• Available Content
• pH
• Liquid-to-Solid Ratio
• Redox
• Dissolution
• Complexation
• Desorption
• Biological Activity
OH-
Major Species
Trace Species
Soluble Salts
DOC
Leachant
Composition
^ Water
Acids
Chelants
DOC
Figure 1. Internal and external factors influencing the leaching process (modified from
Garrabrants and Kosson, 2005).
At the material interface, interaction of the solid materials with the surroundings can lead to
alteration of the material release behavior. In some cases, reactions with components of the
groundwater or subsurface atmosphere may increase release (e.g., through acid attack,
erosion, chelation or complexation reactions), while in other cases, release may be reduced
(e.g., via precipitates which form boundary layers with reduced transport properties). Many
of these external stresses affect both the leaching properties and durability of the material.
For example, the composition of the contacting solution, or leachant, has some influence on
leaching response. Acids and chelants can interact with the inherent chemistry of the solid
phase and alter the LSP of the resultant leachate.
In this document, "solid material" is used as a generic reference to the matrix of concern,
regardless of its nature (e.g., monolithic, granular) in the field. "Leachant" and "leachate"
are reserved to describe, respectively, the contacting liquid in the natural environment before
and after contact with the solid. The associated terms for the contacting fluids used in the
laboratory to characterize the release of constituents from solid materials are referred to as
"eluent" (before contact) and "eluate" (after contact), respectively. This distinction is made
to avoid confusion with field samples during lab-to-field comparisons. Thus, eluents are the
liquid phase specified in leaching tests (e.g., Method 1313 uses dilute acid or base as an
eluent) while the eluates that result from a leaching test are processed for chemical analysis.
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3 LEACHING ASSESSMENT FRAMEWORK
The leaching test methods presented under LEAF were developed to be part of a tiered
assessment methodology that is a more robust, yet flexible, evaluation approach for
estimating environmental release, particularly in applications where current regulatory tests
are not required (e.g., beneficial use determinations, waste delisting, treatability evaluations,
etc.). Under the current regulatory approach, environmental assessment is based on the
simulation of release in a defined "mismanagement" or near-surface disposal scenario (U.S.
EPA 1988; U.S. EPA 1999a). The source term used in this assessment is described by
release estimates for selected metals and organic compounds resulting from single-point
extraction tests which have been designed to simulate the release conditions for the
assessment scenario. However, the U.S. EPA Science Advisory Board (U.S. EPA 1991; U.S.
EPA 1999b; U.S. EPA 2003), the National Academy of Sciences (NRC 2006) and others
(Sanchez et al. 2006; Thorneloe et al. 2009) have criticized these leaching methods for a lack
of critical data collection (e.g., final pH is not recorded), overly-broad application for
materials and scenarios outside the scope of the test design, and limited mechanistic
understanding due to the single release observation provided by the test. In addition, the
results of these simulation tests are limited to the pre-determined assessment scenarios and
are unlikely to address the range of leaching conditions expected occur in actual disposal or
reuse situations.
Recognizing the importance of having a robust, mechanistic environmental assessment
methodology, U.S. EPA conducted a review of available methods, sought Science Advisory
Board input on the suitability of the available leaching test methods, and ultimately selected
the tiered assessment published in the literature (Kosson et al. 2002). The series of
recommended leaching tests published with this manuscript have become the basis for
development of the methods described in this document.
The recommended testing increases in detail and complexity depending on the overall
purpose of the leach testing, the amount of leaching mechanism detail needed, and the
scenario to be evaluated. In the proposed tiered testing approach, Tier 1 tests provide the
least amount of information used for screening purposes. Single batch extractions and
modified versions of the characterization tests shown here may be applicable for screening,
much as commonly used leach tests provide screening level data. Tier 2 consists of
equilibrium-based testing of the material in order to characterize the LSP over a broad range
of plausible management conditions as a function of principle chemical leaching factors of
pH and liquid-solid ratio (L/S). The pH- and L/S-dependent leaching tests can also be
adapted for compliance testing between batches of like materials or against the previous full
detail characterizations, or material specific quality control. Equilibrium tests applicable for
Tier 2 analysis include Methods 1313, 1314, and 1316. The addition of mass transfer rate
(monolith or compacted granular materials) testing using Method 1315 completes the
assessment approach for a third tier of testing for (a) detailed characterization, (b)
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compliance testing, and (c) quality control. The test methods and interpretation protocols
recommended in LEAF provide an integrated approach for evaluating leaching behavior of
materials using a tiered approach that considers pH, liquid-to-solid ratio (L/S), and waste
form properties across a range of plausible field conditions (Kosson et al. 2002; Thorneloe et
al. 2010).
3.1 LEACHING TESTS
Various leaching methodologies applicable to a wide variety of waste forms have been
reviewed (Garrabrants and Kosson 2005) where it was noted that release from solid materials
is most often estimated using the results of one or more extraction tests designed to measure
COPC leaching from materials. Although more than 50 leaching tests have been identified
for various purposes and materials, only a limited number address a range of test conditions.
That is, most leach tests currently being used are designed to simulate constituent release
under a single set of assumptions. Many of these tests are only loosely related to the
environmental conditions under which leaching of the tested material may actually (or
plausibly) occur. In addition, many of the tests that do cover a range of conditions differ in
only minor ways, inferring that a limited set of carefully selected tests can provide
information on constituent leaching over the expected range of possible exposure conditions
(van der Sloot et al. 1997).
In general, leaching test approaches have been designed to simulate release under a specific
set of experimental conditions (i.e., attempt to mimic field conditions). Another approach is
to challenge the waste material to a broad range of experimental conditions known to affect
constituent leaching, with the intent to derive characteristic or fundamental intrinsic
parameters that control leaching. The latter approach allows one data set to be used to
evaluate a range of management scenarios for a material, representing different
environmental conditions (e.g., disposal or beneficial use). This approach is both more
transparent and flexible for assessing the characteristic leaching behavior from granular and
monolithic materials (Kosson et al. 2002; van der Sloot 2002b; van der Sloot 2002a; van der
Sloot and Kosson 2007; van der Sloot et al. 2007).
Leaching test methods may be categorized by whether the intent of the method is to establish
equilibrium between the material and the leachant (e.g., "equilibrium-based test") or to
measure constituent mass transport as a function of leaching time (e.g., "mass transfer-based
tests"). Test procedures additionally may be designed as "batch extraction methods" during
which a solid material is challenged to one or more aliquots of a leaching solution over a
specified time or as "dynamic leaching methods" where fresh leaching solution is
continuously supplied and equilibrium between the test material and the leachant is not
intended to be achieved.
The methods supported in this document are designed to provide characterization of leaching
from a solid material under a broad range of conditions with equilibrium leaching determined
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as functions of pH and L/S in addition to mass transport determined as a function of leaching
time. Of the four methods described in this document, Methods 1313 and 1316 are batch
leaching procedures, while Method 1314 is a flow-through dynamic (column) leaching
method. The fourth procedure, Method 1315 is a hybrid of batch and dynamic styles where a
series of consecutive batch extraction steps are conducted to measure leaching as a function
of time, often referred to either as a "diffusion" or "tank leaching" method.
3.1.1 Influence of pH on Equilibrium
Many of the processes that result in leaching of inorganic constituents (e.g., mineral and
precipitate dissolution, adsorption/desorption reactions, and aqueous solubility of inorganic
species) are strongly pH-dependent. Since inorganic constituents in solid materials may be
(i) incorporated within mineral structures (e.g., strontium or barium substituting for calcium),
(ii) adsorbed to surfaces of mineral phases such as iron oxy(hydr)oxides or organic matter,
(iii) precipitated as low-solubility solids within pore spaces, or (iv) dissolved within the
liquid phase held within the pore structure (Connor 1990), pH is considered a principal
variable controlling the equilibrium between the liquid and solid phases for many inorganic
contaminants. The recommended leaching test for determining the pH-dependence on LSP is
Method 1313. In addition to pH-dependent partitioning, this method also provides an
acid/base titration curve of the material used to estimate the influence of environmental
acidity or alkalinity on changes in resulting eluate pH.
Eluate pH does not directly affect the solubility of most organic contaminants which are
primarily concentrated in isolated organic phases (e.g., tars and grease) or adsorbed to
particulate organic matter (van der Sloot 2002a; van der Sloot 2002b). However, pH does
influence the dissolution of particulate organic matter (POM; i.e., humic substances) which
may be more soluble at high pH. The measured concentrations of organic contaminants in
eluates may be greater than theoretical aqueous solubility values due to binding with
dissolved organic carbon (DOC) or colloidal organic matter. In leachates and eluates, DOC
is often measured as total organic carbon (TOC) in solution. Method 1313 is useful to assess
the effect of DOC on the eluate concentration of organic species. For example, when soil
with high organic content is solidified with Portland cement, an increase in DOC can result in
an increase in the measured leaching concentrations of some contaminants (e.g., metals,
polycyclic aromatic hydrocarbons or PAHs). Thus, pH may still be considered a significant
leaching parameter for organic species.
3.1.2 Influence of Liquid-to-Solid Ratio on Equilibrium
As water percolates through a column of granular or high permeability material, highly
soluble salts (e.g., chloride or nitrate salts of sodium or potassium) are washed out quickly
and the more soluble mineral phases are dissolved. Changes in pore water chemistry as more
soluble components are released can alter the dissolution of the more stable mineral phases
and subsequent pore solutions and leaching of COPCs, as infiltrating water continues to
7
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percolate. These effects can be examined using either batch or column tests. Column tests
allow for careful control of water contact and analysis of aqueous (local) equilibrium as a
function of the amount of fluid passing through the bed mass normalized as an L/S. At low
L/S, concentrations provide insight into the composition of the initial pore solution; while
concentrations at an L/S greater than or equal to 5 mL/g-dry indicate the effects of long-term
exposure on LSP. Method 1314, a column percolation procedure, and Method 1316, a
parallel batch procedure, may be useful in determining how the liquid-solid partitioning is
affected by changes in L/S.
3.1.3 Influence of Mass Transfer Rates
Release of constituents from larger particles of granular material or other materials of low
permeability may be controlled by mass transport of the constituents through the pore
structure to the bulk liquid solid interface. This scenario is the case when a low permeability
material is surrounded by higher permeability fill. Infiltrating water or groundwater flows
around the low permeability material and release occurs at the interface between the flowing
water and the material.
Mass transport is often characterized in terms of the mass flux (i.e., mass released across an
exposed surface unit area over a unit time, e.g., mg/m2yr) or in terms of the cumulated mass
released as a function of leaching time. Transport parameters (e.g., diffusivity) and physical
characteristics (e.g., effective surface area, tortuosity) may be estimated from leaching test
results when certain conditions or assumptions are specified. For example, the observed
diffusion coefficient of a COPC represents a simple diffusion case applicable only under the
assumption that large gradients (e.g., pH) internal to the matrix do not exist. Method 1315
includes provisions for integrating the results of the mass transport test with the results of
equilibrium-based test Method 1313 to evaluate leaching test quality control. These
provisions also help to approximate the mechanisms that control the release of COPCs from
monolithic or compacted granular materials under mass transfer conditions. Of course, these
mechanisms are in force only as long as the low permeability material maintains its physical
integrity. Equilibrium conditions become more significant as monolithic materials physically
degrade or if the material is exposed to very low or intermittent flow conditions.
4 METHOD SUMMARIES AND JUSTIFICATION OF TEST
PARAMETERS
In the following sections, each proposed method is briefly summarized followed by the
rationale supporting the selection of key test conditions specified as part of each method.
Extensive review of international assessment methodologies and leaching test parameters has
been presented elsewhere (van der Sloot et al. 2010). Specific test conditions may be
justified on the basis of the underlying fundamental phenomena, empirical observation
-------
(results of prior testing), numerical simulation, or practicality for implementation. Test
specifications for the four methods are provided at the end of Section 4 (see Table 5).
4.1 PRELIMINARY VERSION OF METHOD 1313
Method 1313 - "Liquid-Solid Partitioning as a Function of Extract pH for Constituents in
Solid Materials using a Parallel Batch Extraction Procedure" is a leaching characterization
method consisting of parallel extractions of a particle-size reduced solid material in dilute
acid or base.
4.1.1 Method Summary
Method 1313 is a batch extraction procedure with parallel extractions designed to provide
information on the partitioning of constituents between solid and liquid phases under
specified conditions. A mass of "as tested" solid material equivalent to a specified minimum
dry mass is added to nine or ten extraction vessels.3 Solutions of dilute nitric acid or sodium
hydroxide are added to each vessel according to a schedule of acid and base additions
formulated from a pre-test titration curve and designed to target specific final pH values
(eluate pH values) between 2 and 13. Extract bottles are tumbled in an end-over-end fashion
for a specified contact time that depends on the particle size of the sample. The extract liquid
is separated from the solid phase via settling or centrifugation, followed by filtration and
preservation of analytical solutions.
Recorded data includes equivalents of acid or base added, extract final pH and electrical
conductivity (EC) with an option for measuring oxidation/reduction potential (ORP) when it
is expected to influence leaching. The concentration of DOC is often measured in eluates
and the active fraction for binding of metals and organic contaminants can be determined
through fractionation of the various organic carbon phases (ISO, 2009). Extract
concentrations for the constituents of concern are measured and plotted as a function of
extract pH and compared to quality control and assessment limits. This method provides a
titration curve of the solid material and the LSP curve for constituents of concern over a
broad pH range that both represents the range of possible environmental leaching conditions,
and also illustrates any changes in leaching chemistry that may occur over this range of
conditions. LSP data as a function of eluate pH may be used with geochemical speciation
models to infer the speciation of solubility-controlling mineral phases and reactive surfaces
(e.g., metal oxides, clay and organic matter) for COPCs.
3 The method requires conducting extractions under natural conditions (i.e., no acid or base addition) as well as
at nine final target pH values. However, if the natural pH of the material falls within the acceptable tolerance of
any target pH point, the target pH extraction is not conducted.
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4.1.2 Constituents of Potential Concern
This method is applicable for inorganic species (e.g., metals, metalloids and ionic salts), non-
volatile organic compounds, and DOC. Given that radionuclides behave chemically as
inorganic species, the method is also applicable for radionuclides provided that the
appropriate modifications are taken to ensure adequate worker protection. Although the
method is capable of providing extracts for evaluation of semi-volatile organic species, the
premise that pH controls liquid-solid partitioning is not directly applicable to these
constituents; however, a secondary effect based on association of certain organic species
(e.g., PAHs) with dissolved organic carbon may be observed.
4.1.3 Target pH Values
The specific target pH values are based on environmental or operationally-defined rationale
as shown in Table 1 (also provided as Table 5 in the method text). Within LEAF, the natural
pH of the material is defined as the eluate pH of a batch extraction of a <5 mm granular
sample in regent water at an L/S of 10 mL/g-dry without addition of acid or base. Full
characterization under Method 1313 requires that a set of eluates be produced with final pH
values satisfying the nine specified pH targets shown in Table 1.
If the natural pH of the "as tested" material falls within the range of any target interval (e.g.,
a natural pH of 6.6 falls within the 7.0±0.5 pH range), there is no need to conduct both the
natural pH extraction and the targeted pH extraction. In this case, the natural pH extraction is
used to represent that pH range and a total of nine parallel extractions would be conducted
(i.e., the natural pH extraction plus eight remaining targeted pH extractions). If that natural
pH falls outside all specified target ranges (e.g., a natural pH of 6.4), the natural pH
extraction is conducted in addition to the nine specified target conditions shown in Table 1
(i.e., ten parallel extractions in total).
These target pH values were selected to standardize the data across the pH profile and to
provide input on the response of the material to environmental stresses over a broad range of
pH values. While the extremes of the specified values may not be achieved under anticipated
field conditions, these values have been selected in order (i) to estimate the fraction of the
total COPC content available for leaching (absent long-term changes in mineral form), (ii) to
represent values that may occur as a result of co-management of diverse materials, and/or
(iii) to facilitate geochemical modeling of the system.
Table 1. Rationale for Method 1313 Final pH Targets.
Value
1
2
pH
Target
2.0±0.5
4.0±0.5
Rationale
Estimates total or available content of cationic and
Lower pH limit of typical management scenario
amphoteric COPCs
10
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3 5.5±0.5 Typical lower range of industrial waste landfills
4 7.0±0.5 Neutral pH region; high release of oxyanions
5 8.0±0.5 Approximately endpoint pH of carbonated alkaline materials
6 9.0±0.5 Minimum of LSP curve for some cationic and amphoteric COPCs4
7 10.5±0.5 Minimum of LSP curve for some cationic and amphoteric COPCs4
8 12.0±0.5 Maximum in alkaline range for LSP curves of amphoteric COPCs
9 13.0±0.5 Upper bound (field conditions) for amphoteric COPCs
variable Natural pH at L/S 10 mL/g-dry (no acid/base addition)
The concentration of COPCs over this pH range defines the partitioning curve between
dissolved species and solid phases as a function of eluate pH and may be used to identify
how constituent LSP is influenced in environmental scenarios with different characteristic
pH values (e.g., co-management with other materials) or when eluate pH varies over time in
response to local environmental conditions (e.g., carbonation of alkali materials, acidification
processes through oxidation, depletion by leaching of pH controlling constituents from the
material). In reporting results, the final pH of the extract must be reported so that leachate
concentrations may be associated with the actual final pH measured in the tests, rather than at
the target pH value. Leaching at any non-measured pH value can then be estimated by
interpolation of the resultant concentration versus pH curve.
4.1.4 Eluent Composition
Method 1313 requires that the final pH of the extract is controlled by addition of dilute acid
or base. The intent is that the pH-controlling agent should be completely dissociated under
test conditions. Thus, organic acids are not recommended for lowering pH below the natural
pH value. In addition, the acid should not significantly interfere with the chemistry of the
system. Nitric acid is specified in the method because, although a mild oxidant, it is less
interfering than other inorganic acids which cause precipitation (e.g., sulfuric or phosphoric
acids) or form complexes (e.g., chloride from hydrochloric acid). While nitric acid is
oxidizing and thereby has the potential to provide a biased estimate of leaching for some
constituents expected to be disposed or utilized in a reducing system, the potential exists in
many environmental scenarios for reducing systems to become oxidized over time.6 The
4 As a whole, the LSP curves for amphoteric and cationic species tend to approach a minimum value in the pH
range between about 9 (e.g., lead) and 11 (e.g., cadmium); therefore, pH targets of 9.0±0.5 and 10.5±0.5 can be
useful for estimating the minimum of the LSP curve in most cases.
5 Natural pH has also been referred to as "own pH" in other publications, e.g., U.S. EPA, Characterization of
Coal Combustion Residues from Electric Utilities - Leaching and Characterization Data, EPA-600/R-09/151,
December 2009.
6 In order to address the reverse case where oxidized systems are exposed to reducing conditions, geochemical
modeling (e.g., using LeachXS™) may be useful.
11
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base specified in the method is sodium hydroxide; although potassium hydroxide may also be
used for cases when sodium is a COPC.
4.1.5 Minimum Dry Mass Equivalent
Minimum amounts of material are specified in order to ensure that a representative
subsample is used in the leaching test. Since heterogeneities are somewhat dependent on
particle size, the minimum sample amount required to be used varies with the particle size of
the "as tested" material. The minimum sample mass for each extracted material aliquot is
specified at 20 g-dry for material < 0.3 mm, 40 g-dry for material < 2 mm, and 80 g-dry for
material < 5 mm. These specifications are expected to result in a representative sample for
most materials provided that adequate initial sample mass is sized reduced, if necessary. The
sample amount used in testing may be increased, with corresponding scale up of leachant
volumes, if sample heterogeneity is determined to be a problem.
The L/S used in leaching tests are based on the dry mass of a solid; however, oven drying
the "as received" material to constant mass prior to testing may be impractical and sometimes
deleterious to the mineral structure. In such cases where the "as received" material must be
dried before testing, air-drying or drying over a nitrogen blanket (e.g., in the case of
oxidation or carbonation sensitive materials) to a moisture content that facilitates material
handling (e.g., less than 10% wet basis) is recommended. Since the "as tested" material is
likely to contain some level of moisture, the required mass of solid materials is specified on
basis of a "dry mass equivalent" (i.e., the mass of an "as tested" sample which, if dried to
constant mass, would result in the specified dry mass). The dry mass equivalent for a
specified value can be calculated if the solids content or moisture content (wet basis) is
known, according to the following equation:
Mtest = *L = _*L - Equation 1
SC (l-MCwet)
where: Mtest is the dry mass equivalent of "as tested" solid material [g]
M^ is the mass of dry material specified in method [g-dry]
SC is the solids content of "as tested" material [g-dry /g], and
MCwet is the moisture content (wet basis) of the "as tested" material [gmo/g]
The specification for the minimum amount of solid material is based on the homogeneity of
the sample and the particle size of the test subsample. The minimum dry mass equivalents
specifications shown in the method assume that, after particle size reduction and sieve
analysis, the solid material has undergone adequate homogenization. Materials which are
visually heterogeneous after sample processing may require more mass to achieve an
adequate representative subsample.
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4.1.6 Particle Size, Liquid-To-Solid Ratio and Contact Time
In batch testing, the time required to approach equilibrium between the liquid and solid
phases depends on a relationship that is a function of particle size, liquid-solid ratio and
contact time.7 Thus, the discussion of one parameter must be conducted in context with the
others. Since the goal of equilibrium extractions is to achieve a practical approximation of
equilibrium between the solid materials and the liquid extraction fluid, the specified contact
time should be long enough to allow for the controlling physical and chemical processes
(e.g., dissolution and diffusion into the liquid phase) to occur. To reach a practical
approximation of equilibrium, the contact time may be adjusted based on either the
maximum particle size of the solid sample or L/S.
4.1.6.1 Particle Size Reduction and Maximum Particle Size
Particle size reduction for solid matrices, especially those matrices which are naturally
monolithic in nature, is often a topic of debate. During batch testing, constituent diffusion
through larger particles may become the rate-limiting mechanism such that particle size
reduction of the material prior to testing is necessary. Decreasing the particle size decreases
the time required to approximate equilibrium by reducing the diffusional distance that a
solute must traverse to the bulk solution, and increases the surface area for interactions
between the solid phase and the bulk solution. However, the desire for a prompt response
from a leach test must be offset by practicality in terms of the effort required for particle size
reduction.
The method of particle size reduction should not alter the chemical or mineral composition of
the material. This means that size reduction operations (e.g., crushing, grind, or milling and
associated sieving) should not introduce foreign matter to the sample, cause loss of
constituents, or excessively alter the temperature of the sample. For environmental
assessment purposes, crushing is less likely to alter the LSP behavior of a material than
grinding or milling to a fine powder due, in part, to shearing stress and heat development
(van der Sloot et al. 2001). In addition, the process should be conducted in a timely manner
in order to minimize the potential for interaction with the atmosphere (e.g., oxidation or
carbonation). Alternately, particle size reduction may be conducted under a controlled
atmosphere, such as a nitrogen-purged in a glove box, but this is not always practical.
Method 1313 allows selection from three specified maximum particle sizes with associated
minimum sample sizes and minimum contact times. Unless it is impractical to do so, all "as
received" material to be tested should be size reduced to a maximum of 5 mm diameter. This
provides an "as tested" sample at the largest allowable particle size. The portion of "as
received" material that is not readily size reduced to less than 5 mm by crushing is discarded
The contact time to reach equilibrium also is a factor of temperature and the fraction of the total or available
constituent content in the solid that is soluble at equilibrium (see Contact Time).
13
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after calculating the mass fraction of the greater than 5 mm and documenting the nature (e.g.,
rocks, sticks, glass, etc.) and approximate particle size of the discarded fraction. Test results
are not corrected to account for the discarded mass.8 Batch extraction at this level of particle
size reduction requires 72 hours of contact time; however, shorter contact times may be used
when further particle size reduction to 2 mm or 0.3 mm is employed. During the particle size
reduction process, it is likely and unavoidable that a distribution of particle sizes will result
rather than a single particle size. Thus, the recommended contact time to be used in Method
1313 should correspond to the particle size for which 85 wt% of the "as tested" sample
passes the specified sieve size (see Contact Time).
4.1.6.2 Liquid-To-Solid Ratio
L/S is defined as the volume of extracting fluid relative to the mass of solid. For batch tests
designed to approximate equilibrium, lower values of L/S reduce the amount of constituent
mass that is required to saturate the liquid phase and, thus, decreases the time required to
reach equilibrium. Although the L/S for fully saturated porous field material (e.g., soils,
wastes, cementitious materials) can be significantly less than 1.0 mL/g-dry, it is not practical
to routinely work in the laboratory setting with solid slurries which result from batch
extraction at very low L/S. At high L/S, differences in eluate concentrations from a similar
method at a standard L/S of 10 mL/g-dry and a modified L/S of 100 mL/g-dry were
explained based on either availability or solubility controlled release (Dijkstra et al. 2008).9
In order to provide a standardized L/S value for batch testing, Method 1313 specifies an L/S
of 10 mL/g-dry which provides balance between practicality10 and time required to approach
equilibrium. In addition, an L/S of 10 mL/g-dry is a reasonable value for extended leaching
interval in the field, such that observed released masses of COPCs from leaching tests can be
used to estimate field behavior.
8 By excluding the mass fraction with particle size greater than 5 mm, some bias may be introduced. However,
irreducible particles are often not the driver for environmental assessment. In addition, particle size reduction is
considered to correlate, to some degree, with durability in use. Therefore, it is unlikely that application
conditions would result in significant particle size reduction to < 5 mm for materials an irreducible mass
fraction of greater than 20%. For these materials, other leaching tests (e.g., Method 1314 in a large diameter
column or Method 1315) may be a more appropriate approach to leaching characterization.
9 In this context, "availability-controlled" release means that the release is limited to the total amount of a
constituent in the solid phase that is available for release under the specified conditions. "Solubility-controlled"
release refers to situations where the release of a constituent is consistent with the solubility as a function of pH
under the specified conditions. For each constituent, the resultant extract concentration under availability-
controlled release is higher than or equal to the solubility-controlled release concentration.
10
Within the context of L/S ratio, "practicality" refers to reasonable expectations of handling solid-liquid
slurries such that a minimum amount of eluate can be expected after filtration.
14
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4.1.6.3 Contact Time
In equilibrium-based leaching tests, the duration of the extraction is set such that the mass
transfer rate does not limit release into the liquid phase. The minimum contact time for batch
testing of particle size reduced material is based on the minimum mass transport time to
reach a fractional equilibrium concentration in a bath of fixed volume surrounding a
spherical particle of a particular diameter (Garrabrants 1997). The numerical solution for
diffusion of a constituent through a spherical particle of diameter 2a into a finite bath as
(Crank 1975):
Mt ^6
— - = 1 - > - - - - — v „ ° ' - ' Equation 2
where Mt is the mass release from a sphere at time t [mg]
M^ is the mass release at infinite time (i.e., equilibrium condition) [mg]
D is the observed diffusion coefficient [m2/s]
a is the spherical radius [m]
qn is the non-zero roots of the relation;
tan (qn )= - ^-r- Equation 3
3 + aqn
where a is the ratio of the volumes of the solution and the sphere [-].
The factional solubility (i.e., the fraction of the available mass that is soluble at equilibrium)
can be expressed as a function of the parameter a as:
M 1
—— = Equation 4
M0 l + l/a
where M0 is the initial available constituent mass in the sphere [mg].
Figure 2 shows a nomagraph of the contact time required to establish 90% of the equilibrium
(vertical axis) in the fixed bath as functions of particle diameter (horizontal axis) and
fractional solubility (diagonal axis, not shown). The fractional solubility is defined as the
fraction of the available content that is soluble at equilibrium. In the figure, the observed
diffusivity of the transporting species is constant at 10"13 m2/s, which is a relatively slow rate
of diffusion based on past observations (sodium free diffusion in water is on the order of 10"9
m2/s while diffusion through concrete may be on the order of 10"12 m2/s).
15
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I
100 q
= 0.9 0.5 0.2 0.1 0.05 0.03
0.02
10 :
1
0.1 1 10
Particle Diameter (2a) [mm]
Figure 2. Contact time required for a species with an observed diffusivity of 10"" mz/s to
reach 90% of equilibrium (Mt/M_ =0.9) based on mass transport as functions of particle
diameter and fractional solubility (M_/MO )• Figure modified from Garrabrants, 1997.
-v-13
The red, short-dashed lines in Figure 2 indicate that spherical particles of 0.3 mm establish
90% of theoretical equilibrium in less than 24 hours regardless of the fractional solubility
value. Over a 48-hour period (green, long-dashed lines), 90% of equilibrium can be
approached for particles of 2 mm if the fractional solubility is less than 0.1 (i.e., less than
10% of the total or available content is soluble in the fixed bath at infinite time). A 72-hour
contact time (blue, dot-dash lines) would allow for particles of 5 mm diameters to approach
90% of equilibrium for fractional solubility values of less than approximately 0.4.
The above caveats with regard to fraction solubility are reasonable for most inorganic species
because the more soluble species (e.g., sodium, boron) would likely have higher observed
diffusion coefficients and, thus, would not be limited by mass transport through the particle
over the test duration.
A similar approach can be used in conjunction with Figure 3 to examine the effect of
diffusivity on the horizontal axis, in this case shown as the negative log of the diffusion
coefficient (pD), on the time required to reach 90% of equilibrium on the vertical axis as a
function of fractional solubility on the diagonal axis (not shown) for a spherical particle of
0.3 mm diameter. The 24-hour test duration specified in Method 1313 would allow 0.3 mm
diameter particles to approach 90% of equilibrium for fractional solubility less than 0.2 for
constituents with a mid-range diffusivity of 10"14 m2/s (pD=14; green, long dash line) and for
16
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fractional solubility less that only 0.01 for constituents with a very low diffusivity of 10"16
m2/s (pD=16; blue, dot-dash line).
M00/M0 = 0.9 0.5 0.2 0.1 0.05 0.03 0.02
V
g
N
14 15
Diffusivity (pD) -Iog[m2/s]
16
Figure 3. Contact time required for a particle of 0.3 mm diameter to reach 90% of
equilibrium (MJM^ =0.9) as function of diffusivity and fractional solubility (M^/MO )•
Figure modified from Garrabrants, 1997.
Based, in part, on the analysis of mass transport from a spherical particle into a bath of fixed
volume, the specifications for contact time as a function of particle size shown in
Table 2 were established.
Table 2. Extraction parameters as function of maximum particle size.
Particle Size
(85 wt% less than)
[mm]
0.3
2.0
5.0
US Sieve
Size
50
10
4
Minimum
Dry Mass
[g-dry]
20±0.02
40±0.02
80±0.02
Contact
Time
[hr]
24±2
48±2
72±2
Suggested
Vessel Size
[mL]
250
500
1000
The above time estimates are based entirely on mass transport considerations assuming that
(i) the diffusing species is readily available for mass transport (i.e., dissolution is not rate-
limiting) and (ii) the solid phase concentration of the species at the center of the particle is
constant (e.g., the species does not deplete). The latter assumption is most likely valid for
17
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most solid materials given the relatively low liquid-to-solid ratio. The former assumption
that dissolution is not kinetically controlled is not valid for all species (e.g., iron oxide
dissolution) and could result in longer required test durations (Dijkstra et al. 2006). The
resultant specifications provided in
Table 2 also consider practicality in striking that balance between test duration and
increasing effort required for further particle size reduction.
4.1.7 Temperature
All test activities are conducted at 21±2 °C which is assumed to be consistent with room
temperature in most laboratories with environmental control. Deviations in temperature of
more than approximately 5 °C may result in changes in constituent concentrations such that
comparison of test results to tests conducted within specification may be misleading.
4.1.8 Agitation
Method 1313 specifies "end-over-end" tumbling as the method of agitation. This method
provides adequate contact between solid and liquid phases as gravity maximizes dispersion
of particles. Other methods of agitation (e.g., rolling, linear or orbital shaking) allow for
settling and the formation of a consolidated slurry phase with minimum solid-liquid contact
area. The rate of agitation is selected to be 30±2 RPM in order to be consistent with
commercially available tumbling apparatuses and equipment in place for currently
standardized methods (e.g., TCLP).
4.1.9 Filtration
In order to process leaching test solid-liquid mixtures for analysis, the bulk solid and liquid
phases must be separated. Coarse separation may be accomplished with settling for 10-15
minutes or centrifugation at an average relative centrifugal force (RCF) of 1,500±100 g for
10±2 minutes. Fine separation for preparation of analytical solutions typically requires
filtration. Method 1313 specifies filtration of solutions for inorganic analysis through 0.45-
um polypropylene membranes. The pore size allows for filtration of fine suspended particles
consistent with the definition of dissolved metals (Csuros and Csuros 2002). Polypropylene
membranes are specified to minimize adsorption of inorganic species onto the filtration
membrane. The filtration step can be conducted under vacuum or pressure with an inert gas,
although pressure filtration is required if mercury is a COPC.
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4.2 PRELIMINARY VERSION OF METHOD 1314
Method 1314 - "Liquid-Solid Partitioning as a Function of Liquid-Solid Ratio for
Constituents in Solid Materials Using an Up-Flow Percolation Column Procedure" is a
leaching characterization test consisting of continuous flow of eluent through a column of
moderately packed granular material.
4.2.1 Method Summary
A solid material is packed11 into a 5 cm diameter by 30 cm long glass column fitted with
polytetrafloroethylene (PTFE) end caps. Deionized water or 1 mM calcium chloride as an
eluent is introduced in an up-flow pumping mode and a series of nine sequential eluate
samples are collected over specific L/S intervals. Up-flow pumping is used to minimize air
entrainment and flow channeling. The default eluent for most materials is reagent water;
however, a solution of 1 mM calcium chloride in reagent water is specified when testing
materials with either a high clay content or high organic matter to prevent deflocculation and
colloid formation from clay and POM aggregates from depletion of divalent cations. Method
1314 is intended to characterize the equilibrium between solid and liquid phases as soluble
species are eluted, so the eluate flow rate is maintained between 0.5-1.0 LS/day to increase
the likelihood of local equilibrium. An elution rate of 0.75 L/S per day also provides a liquid
phase mean residence time for flow through the column that is equivalent to the contact time
for batch testing (i.e., Methods 1313 and 1316). The pH and conductivity of collected eluate
fractions is recorded and analytical samples are filtered, preserved (as appropriate to specific
chemical analyses) and chemically analyzed for COPCs.
Eluate data is plotted as a function of L/S. For the purposes of chemical speciation modeling,
the entire eluent volume up to 10 mL/g dry sample (g-dry) is analyzed in nine specific
fractions. Options are included for applications where less detailed leaching information is
required (see Section 4.2.12). These options include compositing collected eluate fractions
to form a subset of analytical samples or collected of a limited subset of eluents fractions for
analysis.
4.2.2 Particle Size
Accumulated experience from multiple applications for packed bed flow systems has resulted
in the generally accepted relationship that the minimum column diameter should be at least
20 times the nominal material particle size to minimize wall effects and channeling. Using
this approximation, the calculated maximum particle size for the 4.8-cm inside diameter
column described in method is 2.4-mm. In order to provide consistency in sample
Packing should not inhibit the flow of eluent, but should allow eluent to pass through the packed material.
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preparation between the column test and mid-level particle size reduction in the batch testing,
the value can be reduced slightly to 2 mm without effecting flow properties.
Since it is unavoidable that a distribution of particle sizes will result from any particle size
reduction technique, the criteria for the particle size specification in Method 1314 is based on
at least 85 wt% of the "as tested" material passing a sieve at the specified particle size. Thus,
the particle size is specified as 85 wt% less than 2-mm diameter with a maximum particle
diameter of 5 mm (1/10 the column diameter).
As described in batch testing, all "as received" material intended for column testing should
be particle size reduced to 5 mm unless it is impractical to do so. This process provides an
"as tested" sample at the largest allowable particle size. The portion of "as received"
material that is not readily size reduced to less than 5 mm by crushing is discarded after
calculating the mass fraction of the greater than 5 mm and documenting the nature (e.g.,
rocks, sticks, glass, etc.) and approximate particle size of the discarded fraction. Test results
are not corrected to account for the discarded mass.12 The mass passing the 5 mm sieve is
further particle size reduced until at least 85 wt% is less than 2 mm to provide the final "as
tested" material sample.
The specification for particle size reduction in the Method 1314 column test is a minor
modification from the 80% less than 1/20 of column diameter suggested after ruggedness
testing of DIN 19528 column test during the Sickerwasserprognose (leachate forecast)
program conducted in Germany (Grathwohl and Susset 2009; Susset and Grathwohl 2009;
Susset et al. 2009), that allows for consistency in material preparation with the batch methods
(i.e., Method 1313 and Method 1316).
4.2.3 Constituents of Potential Concern
Method 1314 is applicable for inorganic species (e.g., metals, metalloids and ionic salts),
non-volatile organic contaminants and DOC. Given that radionuclides behave chemically as
inorganic species, the method is also applicable for radionuclides provided that the
appropriate modifications are taken to ensure adequate worker protection. Although the
method is capable of providing extracts for evaluation of semi-volatile organic species (e.g.,
PAHs), the materials of construction for the column, seals and tubing must be modified to
minimize adsorption (i.e., stainless steel and glass are preferable construction materials over
most plastics, rubber and PTFE).
12 By excluding the mass fraction with particle size greater than 5 mm, some bias may be introduced. However,
irreducible particles are often not the driver for environmental assessment. In addition, particle size reduction is
considered to correlate, to some degree, with durability in use. Therefore, it is unlikely that application
conditions would result in significant particle size reduction to < 5 mm for materials an irreducible mass
fraction of greater than 20%.
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4.2.4 Eluent Composition
In general, regent-grade water is used in all characterization tests due to minimal interference
with the chemistry of the extraction or elution. However, in cases where clayey materials or
materials with high organic content are tested, a dilute 1 mM solution of calcium chloride is
specified. Dilute calcium chloride minimizes disaggregation of clays and dissolution of
organic matter that can lead to colloid formation and either obstruction of column flow via
plugging in self-filtering materials or washout of very fine particles from the column. The
use of 1 mM calcium chloride as a leaching solution also is reasonable in the context that
infiltrating water under most field conditions is likely to contain dilute concentrations of
divalent cations (Wolt 1994).
4.2.5 Minimum Column Dimensions
The minimum column dimensions are specified as 4.8 cm in diameter and 30-cm long. The
volume contained in a column of these dimensions ensures the use of a minimum subsample
that is representative of the solid material. In addition, these dimensions and subsample
amounts provide adequate analytical sample at the lowest L/S of 0.2 mL/g-dry. This volume
of liquid collected in any fraction /' can be calculated using Equation 5.
VJLS = LSi * Mtest * SC Equation 5
where \^LS is the volume collected for fraction /' [mL],
LS; is the L/S of fraction /' [mL/g-dry],
Mtest is the mass of the "as tested" solid material in the column [g], and
SC is the solid content of the "as tested" material [g-dry/g].
4.2.6 Solids Packing
Method 1314 specifies that granular materials should be packed into the columns in
approximately 5-cm layers with light tapping or tamping for each layer. This method is
intended to minimize subsidence or excessive settling in the column while maintaining flow.
4.2.7 Sand Layers
Method 1314 specifies a 1-cm layer of clean quartz sand (20-30 mesh) placed at top and
bottom of the column packing. The top sand layer provides coarse filtration of the eluate and
the layer thickness should be maintained as specified. The thickness specification for the
bottom sand layer, which serves as bed support and an eluent distribution layer, may be
considered a minimum value and the sand layer thickness may be adjusted to modify bed
volume of the tested material as necessary. The Method 1314 sand layer thickness and grain
size specifications are approximately consistent with the German Sickerwasserprognose
21
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program which recommends a 1-cm maximum filtration bed of 1-2 mm grain size quartz
sand (Kalbe et al. 2007). The sand layers in both analyses are expected to provide bed
support and coarse filtration without significant flow restriction.
4.2.8 Pre-Equilibration
Pre-equilibration of a saturated column is required to ensure that the first eluate fraction is in
equilibrium with the solid material. Ruggedness testing of a European column test, CEN/TS
14405, indicates that the pre-equilibration of column material should be a minimum of 18
hours and up to 72 hours (van der Sloot et al. 2010). These specifications were determined
by the concentrations of constituent in the first eluate fraction with different pre-equilibration
times. Thus, pre-equilibration for overnight and weekend durations are both technically
justified and practical.
4.2.9 Flow Rate
In Method 1314, a flow rate specification of 0.75±0.25 LS/day is set such that the residence
time will be between 0.5 and 1 day in the specified column (i.e., 4.8-cm diameter x 30 cm
bed length) with a solid mass of 500-g-dry material packed at a bed porosity of 40%. An
estimate of bed porosity for packed columns may be made by weighing the entire column
apparatus before and after initial saturation with eluent and calculating the volume of water
retained in the bed as a fraction of the total bed volume.
Flow rate may be calculated using the formula:
Equation 6
MbecTTres
Where Tres is the residence time in the column [day],
8 is the bed porosity [volume of pores/volume of bed],
d is the bed or column diameter [cm]
h is the bed or column height [cm]
Mbed is the dry mass of the bed [g-dry], and
F is the flow rate [LS/day].
Assuming a final L/S of 10 mL/g-dry with eluent flowing at 0.75 L/S per day, the total test
time is approximately 14 days. Ruggedness testing for the Sickerwasserprognose program
required that eluate flow rate be calculated based on bed properties and average contact or
residence time. The mean residence time during the testing phases was 16±1 hours (Kalbe et
22
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al. 2007; Kalbe et al. 2009; Susset and Grathwohl 2009). The flow rate specification in
Method 1314 should result in a slightly longer residence time than indicated in the German
ruggedness testing in order to ensure that local equilibrium has been established. Local
equilibrium may be confirmed by comparing the concentration vs. L/S data between two
columns prepared in the same manner, but with significantly different flow rates (e.g., 0.5
and 1.0 L/S per day). An option for a faster flow rate is available if local equilibrium
conditions during the test can be demonstrated.
4.2.10 Temperature
All test activities are conducted at 21±2 °C which is assumed to be consistent with room
temperature in most laboratories with environmental control. Deviations in temperature of
more than approximately 5 °C may result in changes in constituent concentrations such that
comparison of test results to tests conducted within specification may be misleading.
4.2.11 Filtration and Centrifugation
While eluates in the column test are filtered to some degree through the sand layer at the top
of the column, analytical samples with turbidity greater than 100 Formazin Nephelometric
Units (FNUs) may result in poor analysis. Typically, solutions with high turbidity may be
clarified through a combination of filtration and centrifugation. Method 1314 specifies
filtration of solutions for inorganic analysis through 0.45-um polypropylene membranes for
all eluates, consistent with recommendations stemming from ruggedness testing of a
proposed German column test DIN 19528 (Susset and Grathwohl 2009). Polypropylene
membranes are specified m Method 1314 in order to minimize adsorption of inorganic
species onto the filtration membrane. Eluates prepared for analysis of organic compounds
should not undergo supplemental membrane filtration. The Sickerwasserprognose program
noted significant membrane filtration artifacts and recommended that solutions for organics
analysis not be filtered as there are no suitable membrane materials (Susset and Grathwohl
2009). In addition, organic solutions were found to display artifacts of centrifugation such
that centrifugation should be limited to only those cases where turbidity is greater than 100
FNUs (Susset and Grathwohl 2009). In Method 1314, centrifugation may be required to
facilitate filtration of high turbidity eluates; however, the use of calcium chloride as an eluent
is intended to reduce turbidity by minimizing colloid formation. The filtration step can be
conducted under vacuum or pressure with an inert gas, although pressure filtration is
specified if mercury is a COPC.
4.2.12 Eluate Collection and Compositing for Analytical Samples
Eluates are collected over nine fractions at pre-determined cumulative L/S of 0.2, 0.5, 1.0,
1.5, 2.0, 4.5, 5.0, 9.5, and 10 mL/g-dry. These intervals have been specified in order to allow
for three different levels of analysis: complete characterization, limited analysis and index
testing. The number of chemical analyses for the limited analysis and index testing levels is
reduced through the creation of eluate composites or combinations of eluate fractions (see
23
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Method 1314 Section 12.5 andMethod 1314, Table 1 for details on compositing).
Regardless of the level of analysis, all eluate fractions should be collected to facilitate
uniformity in sample collection and column operation for the method. Having all eluate
fractions collected also provides a source of analytical solutions should a more detailed
analytical scheme be warranted following review of limited analysis or index testing
schemes.
4.2.12.1 Complete Characterization
For purposes of developing a comprehensive characterization of the solid material, all eluate
samples should be processed for analysis. Results may be shown as a function of L/S for
eluate fraction concentrations (see Method 1314, Figure 4) or cumulative release, i.e., total
mass released up to an L/S (see Method 1314, Figure 5). No compositing of eluate fractions
is performed for complete characterization, and all eluate fractions are analyzed (see Method
1314 Table 1, Option A). Eluate concentrations from complete characterization may be used
in conjunction with information regarding environmental management scenarios to estimate
anticipated leaching concentrations, release rates, and extents of release for individual
material constituents in the management scenarios evaluated. In addition, eluate
concentrations may be used along with geochemical speciation modeling to infer the mineral
phases and partitioning processes that control the LSP in the pore structure of the solid
material (van der Sloot and Kosson 2007; van der Sloot et al. 2008).
4.2.12.2 Limited Analysis
Under a limited analysis approach, nine eluate collections and analysis of six analytical
samples are required. If evaluation is based on eluate concentrations, six discrete eluate
fractions are chemically analyzed (see Method 1314 Table 1, Option B). If evaluation is
based on cumulative release, some eluate fractions may be composited by volume-weighted
averaging to create a set of six analytical samples (see Method 1314 Table 1, Option C). The
results of Method 1314, Option C cannot be interpreted on the basis of eluate fraction
concentrations as the LS fraction structure is not preserved upon solution compositing.
4.2.12.3 Index Testing
For the determination of consistency between the subject material and previously
characterized materials, nine eluate collections and analysis of three analytical samples are
required. If consistency is to be determined by eluate concentrations, three discrete eluate
fractions are chemically analyzed (see Method 1314 Table 1, Option D). If consistency is to
be determined by cumulative release, some eluate fractions are composited by volume-
weighted averaging to create a set of three analytical samples (see Method 1314 Table 1,
Option E). The results of Method 1314, Option E cannot be interpreted on the basis of eluate
fraction concentrations as the L/S fraction structure is not preserved upon solution
compositing.
24
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4.3 PRELIMINARY VERSION OF METHOD 1315
Method 1315 - "Mass Transfer Rates of Constituents in Monolithic or Compacted Granular
Materials Using a Semi-dynamic Tank Leaching Procedure" is a leaching characterization
procedure consisting of continuous emersion of a monolithic or compacted granular material
in reagent water at a specified liquid-to-surface area ratio (L/A).
4.3.1 Method Summary
This tank leaching method provides information on the rate of mass transport of constituents
through a monolithic or compacted granular sample. Monolithic samples may be cylinders
or parallelepipeds, while granular materials are compacted into cylindrical molds at optimum
moisture content using Proctor compaction effort. The test sample is moved through a series
of nine eluent-filled tanks of fresh reagent water at L/A ratio of 9±1 mL/cm2 following a
schedule of pre-determined test intervals. For each exchange, the sample is freely drained
and the mass is recorded to monitor the amount of eluent absorbed into the solid matrix. The
eluate pH and specific conductance is measured for each time interval and analytical samples
are collected and preserved accordingly based on the subsequent analytical methods.
The outcome of Method 1315 is nine eluate solutions comprising a set of mass transfer
leaching data. Eluate pH, conductivity, and analyte concentrations are plotted as a function
of time and compared to internal and external quality control data (see Method 1315, Figure
8). Mean interval flux (see Method 1315, Figure 10) and cumulative release (see Method
1315, Figure 12) are calculated based on eluate concentrations and plotted as a function of
time. These data may be used to estimate constituent mass transfer parameters (i.e., observed
diffusivity, tortuosity).
4.3.2 Constituents of Potential Concern
This method is applicable for inorganic species (e.g., metals, metalloids and ionic salts), non-
volatile organic compounds and DOC. In that radionuclides behave chemically as inorganic
species, the method is also applicable for radionuclides given the appropriate modifications
to provide adequate worker protection. The method also is adequate for characterization of
mass transport for non-volatile organic species (e.g., dissolved organic carbon). However,
Method 1315 is not recommended for characterization of leaching for volatile and semi-
volatile species due to low aqueous solubility of organic compounds and the high probability
of volatilization losses over the extended leaching intervals. When mercury is a COPC,
Method 1315 is applicable as long as provisions are taken to ensure a sealed leaching vessel
with minimal headspace in order to minimize losses due to volatilization.
25
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4.3.3 Sample Preparation and Geometry
Monolithic samples are cut or cored from larger samples or molded to size. Compacted
granular samples are compacted at optimum moisture content using either standard or
modified Proctor compaction effort depending on the material field density and workability.
The specimen size is subject to a minimum dimension specified to ensure that depletion of
COPCs does not occur over the duration of the test. For homogenous monolithic materials
(e.g., cement mortars), a minimum specimen dimension of 4 cm is adequate; however, up to
10 or 20 cm might be required in some cases (e.g., concrete containing coarse aggregate) to
obtain a representative sample.
Depletion depth may be estimated as a function of observed diffusion coefficient by iteration
of the equation for mass transport through a semi-infinite media into an infinite bath (Crank,
1975):
C(x,t)-Cs . ( x ^ . „
v ' L = erf r-— Equation 7
c0-cs WrTtJ
where C(x,t) is the time and spatial variant mass concentration in the media [mg/L],
Cs is the constant surface mass concentration [mg/L],
C0 is the initial mass concentration in the media [mg/L],
x is the penetration depth into the sample [cm],
D is the observed diffusion coefficient of a diffusing species [m2/s], and
t is the leaching time [s].
The assumptions of the semi-infinite diffusion model are that (i) the source term is constant
(i.e., depletion does not occur), (ii) the diffusion coefficient is constant, and (iii) the
concentration in the leaching fluid is low enough that the driving force for diffusion remains
high (i.e., infinite bath). While this model has limitations on a practical basis due to the
above assumptions, it can be used to parameterize the depletion depth as a function of
diffusion coefficient.13
The left hand side of Equation 7 provides the ratio of the remaining concentration in the
media to the initial concentration when the surface concentration is zero (Cg =0). This ratio
can be set to 80% such that depletion is defined when 20% of the mass has been removed.
13 The assumption of an infinite bath results in estimated depth of depletion due to leaching that is conservative
(i.e., biased towards greater depth). The test case specified in the method has a relatively large, but finite, bath
designed to maintain a dilute, but not zero concentration, boundary condition during test conditions.
26
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Figure 4 shows the mass fraction remaining, C(x,t)/C0 as a function of depth into a semi-
infinite media at the end a leaching interval consistent with the 63-day duration of Method
1315.
Ml
.3
is
i
a
I
2
1 -
00 .
.o
Of. .
OA .
• T-
OO .
; /" '•'
|T A
'• i •
:/ / 1 .•'
; / ix
•;/ x-1
:/>" !
**
x'
s'
«
«
^~ • • ™
^^^^^^
f,^
*
pD=10
pD=ll
pD=12
pD=13
012345
Depth into Media [cm]
Figure 4. Evaluation of depth of depletion C(x,t)/C0=0.8 as a function of diffusion
coefficient (pD is the negative logarithm of the diffusion coefficient).
Four data series are shown spanning the range of diffusivity14 from very quick (pD=10)to
moderately slow (pD=13) diffusion. The range of diffusivity observed in tank leach tests of
a broad range of waste materials is 11 < pD < 15; thus pD=l 1 represents a reasonable case
for a highly mobile constituent. The red dashed line shows that the maximum depletion
depth set at C(x,t)/C0 = 0.8 is approximately 1.3 cm. Doubling this depletion depth to
account for three dimensional leaching, 2.6 cm minimum depletion distance is well within
the minimum sample dimension of 4 cm specified in Method 1315.
4.3.4 Eluent Composition
In general, regent-grade water is used in all characterization tests due to minimal interference
with the chemistry of the extraction or elution. However, in cases where clayey materials or
materials with high organic content are tested, a dilute 1 mM solution of calcium chloride is
specified. Dilute calcium chloride will minimize disaggregation of clays and dissolution of
organic matter that can lead to colloid formation. Use of 1 mM calcium chloride also is
14 In this report, diffusivities (D) are indicated in units of [m2/s], and therefore pD values have units of -
Iog[m2/s].
27
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reasonable in the context that infiltrating water under most field conditions will contain dilute
concentrations of divalent cations.
4.3.5 Liquid-To-Surface Area Ratio
This method specifies a volume of eluent for each step in the tank leaching process based on
the exposed surface area of the sample. The exposed surface area for compacted granular
materials is equal to the cross sectional area of the mold. For 3-dimensional (3-D) diffusion
from monolithic samples, the exposed surface area for cylinders and parallelepipeds may be
calculated using following expressions:
Acyl = 2 TI r (r + h) Equation 8
Ap = 2 (h • w)+ 2 (w • l)+ 2 (1 • h) Equation 9
where Acyi and Ap are exposed surface areas of a cylinder and parallelepiped,
respectively [cm2],
r is the radius of the cylinder [cm],
h is the height of the cylinder or parallelepiped [cm],
w is the width of a parallelepiped [cm], and
1 is the length of a parallelepiped [cm].
A L/A ratio of 9±1 mL/cm2, as specified in Method 7375, ensures a relatively large, but
finite, bath such that the driving force for diffusion is maintained while allowing for eluate
concentrations consistent with common analytical methods.
4.3.6 Tank-Sample Geometry
The extraction vessel surrounding the sample (i.e., the "tank" of the tank leaching test)
should be sized such that the bulk of the leaching fluid is in contact with the exposed surface
area of the sample. There should be at least 2 cm of clearance between the sample surface
and the tank wall to ensure enough rapid diffusion from the sample surface into the leaching
fluid and minimize the local concentration gradient of leached species external to the sample
surface. The geometry of the tank relative to the sample is very important for 1-D mass
transport cases (e.g., sealed monoliths or compacted granular samples). For these cases, the
inner diameter of the tank should be sized as close as possible to outer diameter of the sample
or sample holder such that the bulk of the leaching fluid is in contact with the expose surface
area when the sample is submerged.
28
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4.3.7 Temperature
All test activities are conducted at 21±2 °C which is assumed to be consistent with room
temperature in most laboratories with environmental control. Deviations in temperature of
more than approximately 5 °C may result in changes in constituent concentrations such that
comparison of test results to tests conducted within specification may be misleading.
The effect of temperature on diffusion coefficients may be evaluated the Stokes-Einstein
equation (Cussler 1997):
D = ksT Equation 1 0
2
where D is the diffusion coefficient [m/s],
kB is the Boltzmann constant [m2kg/s2K],
T is the absolute temperature [K],
\l is the dynamic viscosity of the solvent [Ns/m2], and
R0 is the radius of the diffusing molecule [m].
For a constant viscosity and radius, the Stokes-Einstein equation indicates that the
diffusion coefficient is proportional to temperature, D aT. Thus, when measured at two
temperatures (Ti < T2), the diffusion coefficient increases in proportion according to:
D T T
——a— or D, a—-D, Equation 11
DT T
2 X2 M
4.3.8 Eluent Exchange Sequence
The pre-determined leaching intervals (see Method 1315, Table 1) were selected to balance
practicality15 with eluate concentrations that are consistent with analytical methods. If
leaching intervals are short, eluate concentrations could potentially be below analytical
detection limits. However, if the duration of leaching intervals is long, the mass accumulated
in the eluates until equilibrium is established between the solid and liquid phases and the
driving force for mass transport is reduced to zero.
The sequence of leaching intervals specified m Method 1315 provides several quality control
checks to ensure that equilibrium has not been established in eluates during the test duration.
Eluate concentrations may be compared to LSP data as a function of eluate pH as obtained
15 Practically, in this case, means that eluent exchanges should fall within an 8-hour shift and a 5-day
workweek.
29
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from Method 1313 (see Method 7375, Figure 9). Intervals where equilibrium has been
established will correspond in concentration to LSP data.
Alternately, a quality control check that equilibrium has not occurred may be conducted by
looking at the interval mass flux plotted as a function of arithmetic mean of the time square
root. Since mass flux from a semi-infinite media under the assumption of the simple
diffusion model is proportional to the square root of time, it is common to compare interval
mass flux plotted on log-log axes to a line with a slope of-1/2. However, if chemical
saturation with respect to a precipitated solid phase (i.e., the formation of a saturated aqueous
phase) has occurred in multiple intervals, the eluate concentrations would be the same since
all test fractions use the same volume. Thus, at saturation, the internal mass flux would be
dependent on the cumulative leaching time as shown in Figure 5a for several common tank
leaching tests.
30
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Interval Flux at Saturation
[mg/m2 s]
i-1 "O
>-• O O
o o o
"^•*^
t-l/2
-•^
£-
AASTM C 1308, 2001
DANS 16.1, 1986
ONEN 7345, 2004
LJ i ^si ryvw\
D
0.01 0.1 1 10 1C
a)
Mean Flux Time [days]
Interval Flux at Saturation
[mg/m2 s]
i—*
i-1 "O
>-> o o
- o o o
,
t-l/2^
Equal flu
23-hr inl
l^'"*
Equal flux for]
OMethodl315,2009
xfor
;rvals
\i Ecl
•^-^ 7-d
^^ «•!,
ual flux for
ay Nrtervals
.4-day intervals
0.01
0.1
1
10
100
b) Mean Flux Time [days]
Figure 5. Hypothetical internal mass flux assuming the exchange intervals in the tank leach
test were long enough to results in equilibrium between solid and bulk liquid phases: (a)
common test methods and (b) Method 1315.
The initial flux when the eluates are saturated as shown in Figure 5a closely follow the
square root of time (dashed line) due to the selection of leaching intervals in these tests.
Therefore, a conclusion that the release is diffusion-controlled based on interpretation of the
flux data may be inaccurate. The tank leaching intervals of Method 1315 have been selected
such that intervals of the same duration will display the same internal mass flux if
equilibrium has occurred over the leaching interval (Figure 5b). Noting this systematic
pattern in flux data could be used to facilitate interpretation by ensuring that saturation of the
eluate did not occur during the tank leaching test.
-------
4.3.9 Filtration
Unless the integrity of the sample is compromised during the tank leaching methods, bulk
separation of solids and liquids is not necessary in Method 1315. However, fine separation
for preparation of analytical solutions is required via filtration. Method 1315 specifies
filtration of solutions for inorganic analysis through 0.45-um polypropylene membranes.
Polypropylene membranes are specified to minimize adsorption of inorganic species onto the
filtration membrane. The filtration step can be conducted under vacuum or pressure with an
inert gas, although pressure filtration is specified if mercury is a COPC.
32
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4.4 PRELIMINARY VERSION OF METHOD 1316
Method 1316 - "Liquid-Solid Partitioning as a Function of Liquid-Solid Ratio for
Constituents in Solid Materials Using a Parallel Batch Extraction Procedure" is a leaching
characterization test consisting of five parallel extractions of a particle-size reduced solid
material in reagent water over a range of L/S. This batch test results in LSP data as a
function of L/S whereby estimates of initial leachate and pore water composition, as well as
cumulative release at L/S=10 mL/g-dry, are comparable to the results of Method 1314 (Lopez
Meza et al. 2008) column test. Whereas the column methods, such as Method 1314, allow
for collection of eluates at lower L/S than is practical using a batch extraction test, the batch
test approach described in Method 1316 provides a practical implementation advantage over
column tests for many materials due to simpler equipment and shorter overall time
requirements.
4.4.1 Method Summary
Method 1316 is a batch extraction procedure with five parallel extractions designed to
provide information on the liquid-solid partitioning of constituents as a function of L/S. A
mass of "as tested" solid material equivalent or greater than to a specified minimum dry mass
is added to five extraction vessels. Reagent water is added such that the final L/S in the five
extractions is 0.5, 1.0, 2.0, 5.0, and 10.0, respectively. Extracts are tumbled in an end-over-
end fashion for a specified contact time that depends on the particle size of the sample. The
extract liquid is separated from the solid phase via settling or centrifugation, followed by
filtration and preservation of analytical solutions. The pH, conductivity and constituent
concentrations for each extract are plotted as functions of L/S and compared to quality
control and assessment limits.
4.4.2 Constituents of Potential Concern
This method is applicable for inorganic species (e.g., metals, metalloids and ionic salts), non-
volatile organic compounds and DOC. In that radionuclides behave chemically as inorganic
species, the method is also applicable for radionuclides given the appropriate modifications
to provide adequate worker protection. Although the method is capable of providing extracts
for evaluation of semi-volatile organic species (e.g., PAHs), the materials of construction for
the extraction vessel must be modified to minimize adsorption.
4.4.3 Eluent Composition
In general, regent-grade water is used in all characterization tests due to minimal interference
with the chemistry of the extraction or elution. However, in cases where clayey materials or
materials with high organic content are tested, a dilute 1 mM solution of calcium chloride is
specified. Dilute calcium chloride will minimize disaggregation of clays and dissolution of
33
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organic matter that can lead to colloid formation. Use of 1 mM calcium chloride also is
reasonable in the context that infiltrating water under most field conditions will contain dilute
concentrations of divalent cations.
4.4.4 Minimum Dry Mass Equivalent
Minimum amounts of material are specified in order to ensure that a representative
subsample is used in the leaching test. Since heterogeneities are somewhat dependent on
particle size, the minimum sample amount varies with the particle size of the "as tested"
material. The minimum sample mass for each extracted material aliquot is specified at 20 g-
dry for material < 0.3 mm, 40 g-dry for material < 2 mm, and 80 g-dry for material < 5 mm.
These specifications are expected to result in a representative sample for most materials
provided that adequate initial sample mass is sized reduced, if necessary. The sample amount
used in testing may be increased if sample heterogeneity is determined to be a problem.
The results of leaching tests are often based on the dry mass of a solid; however, oven drying
the "as received" material to constant mass prior to testing may be impractical and sometimes
deleterious to the mineral structure. In such cases where the "as received" material must be
dried before testing, air-drying or drying over a nitrogen blanket (e.g., in the case of
oxidation or carbonation sensitive materials) to a moisture content that facilitates material
handling (e.g., less than 10% wet basis) is recommended. Since the "as tested" material is
likely to contain some level of moisture, the required mass of solid materials is specified on
basis of a "dry mass equivalent" (i.e., the mass of an "as tested" sample which, if dried to
constant mass, would result in the specified dry mass). The dry mass equivalent for a
specified minimum dry mass can be calculated if the solids content or moisture content (wet
basis) is known, according to the following equation:
Equation
s
SC (l-MCwet)
where: Mtest is the dry mass equivalent of "as tested" solid material [g]
M^ is the mass of dry material specified in method [g-dry]
SC is the solids content of "as tested" material [g-dry /g], and
MCwet is the moisture content (wet basis) of the "as tested" material [gmo/g]
The specification for the minimum amount of solid material is based on the homogeneity of
the sample and the particle size of the test subsample. The minimum dry mass equivalents
specifications shown in the method assume that, after particle size reduction and sieve
analysis, the solid material has undergone adequate homogenization. Materials which are
34
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visually heterogeneous after sample processing may require more mass to achieve an
adequate representative subsample.
Since the purpose of Method 1316 is to provide adequate eluate for chemical analysis at low
L/S, the amount of solid material used in each of the five parallel extractions may exceed,
and should exceed in practice, the minimum sample specification. The amount of solid
material may be increased in order to provide adequate solution volume after filtration. For
example, if 200 mL of eluate is required to complete all analytical methods, the amount of
solid materials for the five extractions should follow the scheme shown in Table 3.
Table 3. Suggested Solid Amounts for Method 1316.
Test Position
T01
T02
T03
T04
T05
L/S
[mL/g-dry]
10
5
2
1
0.5
Desired Eluate
[mL]
200
200
200
200
200
Solid Material
[g-dry]
20
40
100
200
400
4.4.5 Specified Liquid-To-Solid Ratios
In order to provide a standardized set of L/S values for batch testing, Method 1316 specifies
L/S of 10, 5, 2, 1 and 0.5 mL/g-dry. This range covers the range of L/S consistent with
Methodl313 and Method 1314, balanced with the practicality of recovering eluate from
extracts of granular materials at low L/S. In addition, an L/S of 10 mL/g-dry is a reasonable
value for extended leaching interval in the field, such that observed released masses of
COPCs from leaching tests can be used to estimate field behavior.
4.4.6 Particle Size, Liquid-To-Solid Ratio, and Contact Time
In batch testing, the time required to approach equilibrium between the liquid and solid
phases depends on a relationship that is a function of particle size, liquid-solid ratio and
contact time.16 Thus, the discussion of one parameter must be conducted in context to the
others. Since the goal of equilibrium extractions is to achieve a practical approximation of
equilibrium between the solid materials and the liquid extraction fluid, the specified contact
time should be long enough to allow for the controlling physical and chemical processes
(e.g., dissolution and diffusion into the liquid phase) to occur. To reach a practical
approximation of equilibrium, the contact time may be adjusted, to some degree, based on
either the maximum particle size of the solid sample or L/S.
16 The contact time to reach equilibrium also is a factor of temperature and the fraction of the total or available
constituent content in the solid that is soluble at equilibrium (see Contact Time).
35
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4.4.6.1 Particle Size Reduction and Maximum Particle Size
Particle size reduction for solid matrices, especially those matrices which are naturally
monolithic in nature, is often a topic of debate. During batch testing, diffusion through larger
particles may become the rate-limiting mechanism such that particle size reduction of the
material prior to testing is necessary. Decreasing the particle size decreases the time required
to approximate equilibrium by reducing the diffusional distance that a solute must traverse to
the bulk solution and increasing the surface area for interactions between the solid phase and
the bulk solution. However, the desire for a prompt response from a leach test must be offset
by practicality in terms of the effort required for particle size reduction.
The approach for particle size reduction should not alter the chemical or mineral composition
of the material. This means that size reduction operations (e.g., crushing, grind, or milling
and associated sieving) should not introduce foreign matter to the sample, cause loss of
constituents, or alter the temperature the sample excessively. In addition, the process should
be conducted as quickly as is reasonably possible in order to minimize the potential for
interaction with the atmosphere (e.g., oxidation or carbonation). Alternately, particle size
reduction may be conducted under a controlled atmosphere, such as a nitrogen-purged in a
glove box, but this is not always practical.
Method 1316 allows selection from three specified maximum particle sizes with associated
minimum sample sizes and minimum contact times. Unless it is impractical to do so, all "as
received" material to be tested should be size reduced to a maximum of 5 mm diameter. This
provides an "as tested" sample at the largest allowable particle size. The portion of "as
received" material that is not readily size reduced to less than 5 mm by crushing is discarded
after calculating the mass fraction of the greater than 5 mm and documenting the nature (e.g.,
rocks, sticks, glass, etc.) and approximate particle size of the discarded fraction. Test results
are not corrected to account for the discarded mass.17 Batch extraction at this level of
particle size reduction requires 72 hours of contact time; however, shorter contact times may
be used when further particle size reduction to 2 mm or 0.3 mm is employed. During the
particle size reduction process, it is likely and unavoidable that a distribution of particle sizes
will result rather than a single particle size. Thus, the recommended contact time to be used
in Method 1316 should correspond to the particle size for which 85 wt% of the "as tested"
sample passes the specified sieve size (see Contact Time).
17 By excluding the mass fraction with particle size greater than 5 mm, some bias may be introduced. However,
irreducible particles are often not the driver for environmental assessment. In addition, particle size reduction is
considered to correlate, to some degree, with durability in use. Therefore, it is unlikely that application
conditions would result in significant particle size reduction to < 5 mm for materials an irreducible mass
fraction of greater than 20%. For these materials, other leaching tests (e.g., Method 1314 in a large diameter
column or Method 1315) may be a more appropriate approach to leaching characterization.
36
-------
4.4.6.2 Liquid-To-Solid Ratio
The volume of extracting fluid relative to the mass of solid is the liquid-to-solid (LS) ratio.
For batch tests designed to approximate equilibrium, lower L/S reduce the amount of
constituent mass that is required to saturate the liquid phase and, thus, decreases the time
required to reach equilibrium. Although the L/S of fully saturated porous field material (e.g.,
soils, wastes, cementitious materials) can be significantly less than 1.0 mL/g-dry, it is not
practical to routinely work in the laboratory setting will solid slurries which result from batch
extraction at very low L/S. At high L/S, differences in eluate concentrations from a similar
method at a standard L/S of 10 mL/g-dry and a modified L/S of 100 mL/g-dry were
explained based on availability or solubility controlled release (Dijkstra et al. 2008). 18
4.4.6.3 Contact Time
In equilibrium-based leaching tests, the duration of the extraction is set such that the mass
transfer rate does not limit release into the liquid phase. The minimum contact time for batch
testing of particle size reduced material is based on the minimum mass transport time to
reach a fractional equilibrium concentration in a bath of fixed volume surrounding a
spherical particle of a particular diameter (Garrabrants 1997). The numerical solution for
diffusion of a constituent through a spherical particle of diameter 2a into a finite bath as
(Crank 1975):
Mt ^6 „ . .
— - - 1 - > - - - '- — ^v „ n° ' - f Equation 2
where Mt is the mass release from a sphere at time t [mg]
M^ is the mass release at infinite time (i.e., equilibrium condition) [mg]
D is the observed diffusion coefficient [m2/s]
a is the spherical radius [m]
qn is the non-zero roots of the relation;
tan (q ) = - -^-r- Equati on 3
3 + aq:
where a is the ratio of the volumes of the solution and the sphere [-].
18 In this context, "availability-controlled" release means that the release is limited to the total amount of a
constituent in the solid phase that is available for release under the specified conditions. "Solubility-controlled"
release refers to situations where the release of a constituent is consistent with the solubility as a function of pH
under the specified conditions. For each constituent, the resultant extract concentration under availability-
controlled release is higher than or equal to the solubility-controlled release concentration.
37
-------
The factional solubility (i.e., the fraction of the available mass that is soluble at equilibrium)
can be expressed as a function of the parameter a as:
M.. 1 . A
= Equation 4
M0 1 + 1/a
where M0 is the initial available constituent mass in the sphere [mg].
Figure 2 shows the contact time required to establish 90% of the equilibrium (vertical axis) in
the fixed bath as functions of particle diameter (horizontal axis) and fractional solubility
(diagonal axis, not shown). The fractional solubility is defined as the fraction of the
available content that is soluble at equilibrium. In the figure, the observed diffusivity of the
transporting species is constant at 10"13 m2/s, which is a relatively slow rate of diffusion
based on past observations (sodium free diffusion in water is on the order of 10"9 m2/s while
diffusion through concrete may be on the order of 10"12 m2/s).
The red, short dashed lines in Figure 6 indicate that spherical particles of 0.3 mm established
90% of theoretical equilibrium in less than 24 hours regardless of the fractional solubility
value. Over a 48-hour period (green, long dash lines), 90% of equilibrium can be approached
for particles of 2 mm if the fractional solubility is less than 0.1 (i.e., less than 10% of the total
or available content is soluble in the fixed bath at infinite time). A 72-hour contact time
(blue, dot-dash lines) would allow for particles of 5 mm diameters to approach 90% of
equilibrium for fractional solubility values of less than approximately 0.4. These caveats
with regard to fraction solubility are reasonable for most inorganic species because the more
highly soluble species (e.g., sodium, boron) would likely have higher observed diffusion
coefficients and, thus, would not be limited by mass transport through the particle over the
test duration.
38
-------
100 q
= 0.9 0.5 0.2 0.1 0.05 0.03
0.02
10 •
a
H
1
0.1 1 10
Particle Diameter (2a) [mm]
Figure 6. Contact time required for a species with an observed diffusivity of 10"" mz/s to
reach 90% of equilibrium (M^M^ =0.9) based on mass transport as functions of particle
diameter and fractional solubility (M^/MO )• Figure modified from Garrabrants, 1997.
-v-13
A similar approach can be used in conjunction with Figure 7 to examine the effect of
diffusivity (horizontal axis), in this case shown as pD or the negative log of the diffusion
coefficient, on the time required to reach 90% of equilibrium (vertical axis) as a function of
fractional solubility (diagonal axis not shown) for a spherical particle of 0.3 mm diameter.
The 24-hour test duration specified in Method 1316 would allow 0.3 mm diameter particles
to approach 90% of equilibrium for fractional solubility less than 0.2 for constituents with a
mid-range diffusivity of 10"14 m2/s (pD=14; green, long dash line) and for fractional
solubility less that only 0.01 for constituents with a very low diffusivity of 10"16 m2/s
(pD=16; blue, dot-dash line).
39
-------
100 q
= 0.9 0.5 0.2 0.1 0.05 0.03 0.02
10 :-
s
a
I
H
14 15
Diffusivity (pD) -Iog[m2/s]
16
Figure 7. Contact time required for a particle of 0.3 mm diameter to reach 90% of
equilibrium (MJM^ =0.9) as function of diffusivity and fractional solubility (M^/M,, ).
Figure modified from Garrabrants, 1997.
Based, in part, on the analysis of mass transport from a spherical particle into a bath of fixed
volume, the specifications for contact time as a function of particle size shown in
Table 2 were established. The above time estimates are based entirely on mass transport
considerations assuming that (i) the diffusing species is readily available for mass transport
(i.e., dissolution is not rate-limiting) and (ii) the solid phase concentration of the species at
the center of the particle is constant (e.g., the species does not deplete). The latter
assumption is most likely valid for most solid materials given the relatively low liquid-to-
solid ratio. The former assumption that dissolution is not kinetically controlled is not valid
for all species (e.g., iron oxide dissolution) and could result in longer required test durations
(Dijkstra et al. 2006). The resultant specifications provided in Table 4 also consider
practicality in striking that balance between test duration and increasing effort required for
further particle size reduction.
40
-------
Table 4. Extraction Parameters as Function of Maximum Particle Size.
Particle Size
(85 wt% less than)
[mm]
0.3
2.0
5.0
U.S. Sieve
Size
50
10
4
Minimum
Dry Mass
[g-dry]
20±0.02
40±0.02
80±0.02
Contact
Time
[hr]
24±2
48±2
72±2
Suggested
Vessel Size
[mL]
250
500
1000
4.4.7 Temperature
All test activities are conducted at 21±2 °C which is assumed to be consistent with room
temperature in most laboratories with environmental control. Deviations in temperature of
more than approximately 5 °C may result in changes in constituent concentrations such that
comparison of test results to tests conducted within specification may be misleading.
4.4.8 Agitation
Method 1316 specifies "end-over-end" tumbling as the method of agitation. This method
provides adequate contact between solid and liquid phases as gravity maximizes dispersion
of particles. Other methods of agitation (e.g., rolling, linear or orbital shaking) allow for
settling and the formation of a consolidated slurry phase with minimum solid-liquid contact
area. The rate of agitation is selected to be 30±2 RPM in order to be consistent with
commercially available tumbling apparatuses and equipment in place for currently
standardized methods (e.g., TCLP).
4.4.9 Filtration
In order to process leaching test solid-liquid mixtures for analysis, the bulk solid and liquid
phases must be separated. Coarse separation may be accomplished with settling for 10-15
minutes or centrifugation at an average relative centrifugal force (RCF) of 1,500±100 g for
10±2 minutes. Fine separation for preparation of analytical solutions typically requires
filtration. Method 1316 specifies filtration of solutions for inorganic analysis through 0.45-
um polypropylene membranes. Polypropylene membranes are specified to minimize
adsorption of inorganic species onto the filtration membrane. The filtration step can be
conducted under vacuum or pressure with an inert gas, although pressure filtration is
specified if mercury is a COPC.
41
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Table 5. Comparison of Test Specifications for Preliminary Versions of Methods 1313, 1314, 1315, and 1316.
Test Name
Test Type
Test
Description
Sample Type
Dimension
Target
Constituents
Eluent
Composition
pH Range
Minimum
Amount of
Solid
Eluent Volume
Number of
Test Fractions
Method 1313
Equilibrium;
pH-dependence
Parallel batch extractions
as function of pH
Granular
Particle size of 85%
(mass/mass) less than 0.3
mm, 2.0 mm, or 5.0 mm
Inorganic, non-volatile,
and semi-volatile organic
species
Reagent water with
additions of HNOs or
NaOH
<2 to >12 at specified
targets
20 g-dry each extract
L/SoflOmL/g-dry
9 (10 if natural pH is not
within a target range)
Method 1314
Equilibrium;
L/S
Column test performed
in up-flow mode
Granular
Particle size of 85%
(mass/mass) less than 2
mm and 100% (m/m)
less than 5 mm
Inorganic, non-volatile,
and semi-volatile organic
species
Reagent water or 1 mM
CaCl2
pH dictated by solid
buffering
300 g
L/S varies with
percolation time
9
Method 1315
Mass transfer;
mass transport rates
Tank test with periodic
eluent renewal
Monolithic - cylinder or
cube with 40-mm
minimum dimension
Granular - compacted
cylinder with 40-mm
minimum height
Inorganic and non-
volatile organic species
Reagent water or 1 mM
CaCl2
pH dictated by solid
buffering
500 g
Liquid-surface area ratio
(L/A)of lOmL/cm2
9
Method 13 16
Equilibrium;
L/S
Parallel batch extractions
as function of L/S
Granular
Particle size of 85%
(mass/mass) less than 0.3
mm, 2.0 mm, or 5.0 mm
Inorganic, non-volatile,
and semi-volatile organic
species
Reagent water or 1 mM
CaCl2
pH dictated by solid
buffering
20 g-dry each extract
L/S of 10, 5.0, 2.0, 1.0
and 0.5 mL/g-dry
5
42
-------
Test Name
Contact Time
per Test
Fraction
Temperature
Agitation
Assays
Filtration
Comments
Method 1313
Based on particle size:
24 hr (0.3 mm)
48 hr (2 mm)
72 hr (5 mm)
21±2°C
End-over-end rotation at
30±2 rpm
pH, electrical
conductivity, redox
(optional), IC/DOC,
COPC concentrations
Settling/ centrifugation;
filtration at 0.45- m
Extensive QA/QC
including method blanks
(maximum acid addition,
maximum base addition,
reagent water) and
analytical quantification/
detection limits
Method 1314
Based on flow rate
(Total test duration -10
days)
21±2°C
None
pH, electrical
conductivity, redox
(optional), IC/DOC,
COPC concentrations
Settling/ centrifugation;
filtration at 0.45- m
Extensive QA/QC
including method blanks
(reagent water),
comparison to Method
1313, and analytical
quantification / detection
limits
Method 1315
Eluent renewal at
specified intervals of 2,
23 and 23 hr; 5, 7, 14, 7,
and 14 days
21±2°C
None
pH, electrical
conductivity, redox
(optional), IC/DOC,
COPC concentrations
Settling/ centrifugation;
filtration at 0.45- m
Extensive QA/QC
including method blanks
(reagent water),
comparison to Method
1313, and analytical
quantification / detection
limits
Method 13 16
Based on particle size:
24 hr (0.3 mm)
48 hr (2 mm)
72 hr (5 mm)
21±2°C
End-over-end rotation at
30±2 rpm
pH, electrical
conductivity, redox
(optional), IC/DOC,
COPC concentrations
Settling/ centrifugation;
filtration at 0.45- m
Extensive QA/QC
including method blanks
(reagent water),
comparison to Method
1313, and analytical
quantification / detection
limits
43
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5 ESTIMATES OF LABORATORY PROCESSING TIME, MATERIAL
REQUIREMENTS AND SUPPLY/EQUIPMENT COSTS
This document provides estimates of time, material and costs for each of the four test methods as
a means of illustrating the required resources to complete these tests.
5.1 LABOR/PROCESSING TIME
Table 6 shows approximate labor time (in hours) and process time (in days) to complete a test
run and two subsequent test replicates. Process time considers the duration of time from when
the subject material is received to the completion of the test replicate and includes all preparatory
steps as specified in the test method. Labor time considers only that time when a technician is
actively working on a test method which is often a fraction of the total processing time (e.g., the
technician is free to work elsewhere when batch tests are tumbling or column test are not being
monitored).
Table 6. Summary of Estimates for Labor Time and Total Processing Time
Method 1313
Method 1314
Method 1315
Method 1316
Test (singlet)
Labor
[hr]
10a-15
12
15
6
Process
[d]
7a-12
21
64b-69
7
+1 Replicate
(duplicate)
Labor
[hr]
15a-20
20
25
8
Process
[d]
7a-14
21
69
7
+2 Replicates
(triplicate)
Labor
[hr]
20a-25
28
35
10
Process
[d]
7a-14
21
69
7
a Labor and processing time are reduced if prior knowledge of material behavior is available (e.g., titration curve).
b Processing time is longer for granular materials due to added steps (e.g., optimum density analysis, packing
samples).
A step-by-step breakdown of labor time estimates is presented in Table E-l through Table E-4
found in Appendix E. Labor time estimates consider that the laboratory technician is familiar
with the test method, but not significantly experienced. Thus, the labor time required to conduct
the initial tests when a technician is still learning the test method sequence may be longer than
provided in the table, whereas significant time reduction may be seen for well-experienced
laboratory technicians. All labor time estimates account for reduced time based on "economy of
scale" (e.g., moisture content, drying, particle-size reduction may be conducted for all replicates
at one time).
44
-------
A useful presentation of process time is a Gantt style chart as shown in Figure 8 through Figure
11. These figures show the method task duration and the critical path relationship between tasks.
For example, the "as received" moisture content of a subject material is independent of other
task; whereas, particle size analysis or reduction of "as received" material to produce an "as
tested" sample is essential for all subsequent tasks for Method 1313, Method 1314, and Method
1315. Some processing time may be saved if air drying of granular "as received" material is not
necessary. All task durations estimates are based on previous experience and are considered to
be conservative (i.e., over-estimate task duration). Schedules for batch extraction procedures
(Method 1313 and Method 1316) are based on working days, whereas schedules for flow-
dependent and time-dependent procedures (Method 1314 and Method 1315, respectively) are
include weekends.
45
-------
Method 1313 Task
1 Moisture Content - "as received
2 Air Drying
3 Particle-Size Analysis/Reduction
4 Moisture Content - "as tested
5 Pre-test Titralion #1
5b Pre-test Titration #2 (optional)
6 Extraction (Rep A)
6b Extraction (Rep B)
Figure 8. Gantt Style Chart of A Typical Method 1313 Processing Schedule.
46
-------
Notes on Figure 8.
1) Schedule is based on workdays (i.e., weekends will add time to total).
2) Particle-size reduction assumes a relatively easy material to reduce (e.g., coal combustion residues, soils) via mechanical grinder or light hand
grinding with mortar/pestle.
3) Green case (hatched) - baseline case with air drying and two rounds of pre-test titration (10 pre-test titration points in all).
4) Red case (solid) - shortened case when air drying is not required for particle-size analysis/reduction.
5) Blue case (dotted) - shortened case when prior titration knowledge is adequate to complete extractions.
47
-------
Method 1314 Task
Day 1 Day 2 Day 3
1 Moisture Content - as received
2 Air Drying (optional)
3 Particle-Size Analysis/Reduction
4 Moisture Content - "as tested"
5 Apparatus Setup
6 Co umn Test
-
Figure 9. Gantt Style Chart of a Typical Method 1314 Processing Schedule.
Notes on Figure 9.
1) Schedule is based on calendar days (i.e., column/fraction collection continues over weekends).
2) Particle-size reduction assumes a relatively easy material to reduce (e.g., coal combustion residues, soils) via mechanical grinder or light hand
grinding with mortar/pestle.
3) Apparatus set includes sample wetting and equilibration overnight.
4) Green case (hatched) - baseline case.
5) Red case (solid) - shortened case when air drying is not required for particle-size analysis/reduction.
48
-------
Method 1315 Task
1 Moisture Content - "as received"
2 Air Drying (optional)
3 Particle-Size Analysis/Reduction
4 Moisture Content - "as tested"
5 Optimum Moisture - granular
6 Sample Preparation
7 Moisture Content - "as packed"
8 Tank Leaching
Da
Hill
.
'.-'.-
yl
Illl
Day 2
Day 3
Illllllll
Da
Illl
y4
Hill
:•:•
Day 5
:,.:,,
.,,....
Da
Illl
M
:•:•
. • . •
y6
Illl
Illl
Day?
1
: ;:-:-: ;:
.•-•.•.•-
DayS
:,,.::
.........
DayS
Hill
• - •• -i
Day 63
Day 64
I1"'""
Figure 10. Gantt Style Chart of a Typical Method 1315 Processing Schedule.
49
-------
Notes on Figure 10.
1) Schedule is based on calendar days (i.e., tank leaching and refreshes continue over weekends).
2) Particle-size reduction assumes a relatively easy material to reduce (e.g., coal combustion residues, soils) via mechanical grinder or light hand grinding with
mortar/pestle.
3) Green case (hatched) - baseline case for granular materials with air drying.
4) Red case (solid) - shortened case for granular materials when air drying is not required for particle-size analysis/reduction.
5) Blue case (dotted) - baseline case for monolithic materials.
50
-------
Method 1316 Task
Day1 Day 2 Day 3
1 Moisture Content - as received
2 Air Drying (optional)
3 Particle-Size Analysis/Reduction
4 Moisture Content - "as tested"
6 Extraction (Rep A)
6b Extraction (Rep B)
be Extraction (Rep C)
Figure 11. Gantt Style Chart of a Typical Method 1316 Processing Schedule.
Notes on Figure 11.
1) Schedule is based on workdays (i.e., weekends will add time to total).
2) Particle-size reduction assumes a relatively easy material to reduce (e.g., coal
combustion residues, soils) via mechanical grinder or light hand grinding with
mortar/pestle.
3) Green case (hatched) - baseline case with air drying.
4) Red case (solid) - shortened case when air drying is not necessary for particle-size
analysis/reduction.
51
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5.2 MATERIAL REQUIREMENTS
An estimate of the amount of solid material required to conduct all steps in each test method is
shown in Table 7 for a single test and two subsequent test replicates. These estimates are based
on minimum required dry mass for each test with allowance for a 50% safety factor and an
assumed "as received" moisture content of 20% on a wet basis (i.e., solids content of 80%).
Thus, the estimates shown in Table 7 may be considered to be conservative for most cases and
should provide sufficient material to allow for minor mistakes in laboratory procedures.
Table 7. Summary of Solid Materials Required for Test Methods
Test
(singlet)
+1 Replicate
(duplicate)
+2 Replicates
(triplicate)
Method
Method
Method
Method
1313
1314
1315
1316
(granular)
Subtotal
w/ 50% safety
800
700
5,000
1,000
[kg-dry]
[kg-dry]
g-dry 1
g-dry
g-dry
g-dry
7.5
11.0
1
6
2
,200
^400
,500
,000
g-dry
g-dry
g-dry
g-dry
10.0
15.0
1
2
8
3
,600
,100
,000
,000
g-dry
g-dry
g-dry
g-dry
15.0
22.0
Mass at 80% Solids Content [kg]
15.0
20.0
30.0
The material estimate for Method 1315 is based on testing of a compacted granular sample. In
this case, material in addition to that required for the test samples must be provided in order to
determine the optimum moisture/density relationship and determine a target moisture content for
packing of test samples. Thus, the compact granular case typically requires more sample mass
than the monolithic material case. When testing monolithic materials, the amount of sample for
Method 1315 will depend on sample geometry and dimensions as well as material density. For
example, a 10-cm diameter by 10-cm long cylinder of a monolithic material with a density of 2.0
g/cm3 would require a sample of approximately 1,600 g.
5.3 SUPPLIES AND EQUIPMENT
Total estimated costs of supplies and equipment for the first test run and two subsequent
replicate tests are shown in Table 8 for each of the four test methods. Supplies costs include
consumable items which are not reused after the tests (e.g., filter paper, bottles, etc.) whereas
equipment cost include both capital purchases (e.g., tumblers, pumps, compaction rammers, etc.)
and supplies which may be cleaned and reused between test replicates (e.g., filter holders).
52
-------
Table 8. Summary of Estimated Supply and Equipment Costs (as of July 2010)
Method 1313
Method 1314
Method 13 15a
Method 1316
Test (s
Supply
$200
$110
$170
$85
inglet)
Equip.
$8,200
$4,400
$2,000
$7,500
+1 Replicate
(duplicate)
Supply Equip.
$310
$210
$260
$160
$9,100
$5,800
$3,000
$8,000
+2 Rep
(tripl
Supply
$430
$310
$350
$230
ilicates
icate)
Equip.
$10,000
$7,100
$4,000
$8,600
a Method 1315 cost shown for more expensive material type (granular).
These cost estimates in Table 8 are based on items and costs for supplies and equipment found
primarily in the Fisher Scientific online catalog as detailed in Appendix G. The items presented
in the appendix have been selected as examples of items which may be used to complete these
test methods, but selection does not denote endorsement of vendor, manufacturer or product by
the authors or U.S. EPA.
The cost estimates for test replicates account for "economy of scale" within each method (e.g.,
blanks as assumed to be conducted once for all test replicates). However, some savings may
occur by limiting equipment purchases when a laboratory is preparing the conduct multiple test
methods (e.g., the same tumbler may be used to conduct both Method 1313 &n& Method 1314, all
test may use the same set of filter holders).
53
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6 REFERENCES
CEN/TS-2 (2009) Generic Horizontal Up-Flow Percolation Test for Determination of the
Release of Substances form Granular Construction Products, CEN/TC 351, Brussels, Belgium.
CEN/TS-3 (2009) Generic Horizontal Dynamic Surface Leaching Test (DSLT) for
Determination of Surface Dependent Release of Substances from Monolithic or Plate-like or
Sheet-like Construction Products, CEN/TC 351, Brussels, Belgium.
CEN/TS 14405 (2004) Characterization of Waste - Leaching Behavior Tests - Up-flow
Percolation Test (under specified conditions), CEN, Brussels, Belgium.
CEN/TS 14429 (2005) Characterization of Waste - Leaching Behavior Tests - Influence of pH
on Leaching with Initial Acid/Base Addition, CEN, Brussels, Belgium.
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on Leaching with Continuous pH Control, CEN/TC 292, Brussels, Belgium.
CEN/TS 15863 (2009) Characterization of Waste - Leaching Behavior Tests - Dynamic
Monolithic Leaching Test with Periodic Leachant Renewal, CEN/TC 292, Brussels, Belgium.
Connor, J.R. (1990) Chemical Fixation and Solidification of Hazardous Wastes, Van Nostrand
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Crank, J. (1975) The Mathematics of Diffusion, Oxford University Press, London, UK.
Csuros, M. and C. Csuros (2002) Environmental Sampling and Analysis of Metals, CRC Press
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Cussler, E.L. (1997) Diffusion: Mass Transfer in Fluid Systems, Cambridge University Press,
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Dijkstra, J.J., J.C.L. Meeussen, H.A. Van der Sloot and R.N.J. Comans (2008) "A consistent
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Garrabrants, A.C. (1997) Development and Application of Fundamental Leaching Property
Protocols for Evaluating Inorganic Release from Wastes and Soils, Chemical and Biochemical
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Garrabrants, A.C. and D.S. Kosson (2005) Leaching processes and evaluation tests for inorganic
constituent release from cement-based matrices, Stabilization/Solidification of Hazardous,
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ISO/TS 21268-3 (2007) Soil Quality - Leaching Procedures for Subsequent Chemical and
Ecotoxicological Testing of Soil and Soil Materials - Part 3: Up-flow Percolation Test,
International Organization for Standardization (ISO), Geneva, Switzerland.
ISO/TS 21268-4 (2007) Soil Quality - Leaching Procedures for Subsequent Chemical and
Ecotoxicological Testing of Soil and Soil Materials - Part 4: Influence of pH on Leaching with
Initial Acid/Base Addition, International Organization for Standardization (ISO), Geneva,
Switzerland.
Kalbe, U., W. Berger and F.-G. Simon (2009) Results of German Ring Tests on the Validation of
Leaching Standards for Source Term Determination, WASCON 2009: Sustainable Management
of Wastes and Recycled Materials in Construction, Lyon, France.
Kalbe, U., W. Berger, F.-G. Simon, J. Eckardt and G. Christoph (2007) "Results of
interlaboratory comparisons of column percolation tests," Journal of Hazardous Materials,
148(3): 714-720.
Kosson, D.S., F. Sanchez, P. Kariher, L.H. Turner, R. DeLapp and P. Seignette (2009)
Characterization of Coal Combustion Residues from Electric Utilities - Leaching and
Characterization Data, Washington DC, U.S. Environmental Protection Agency, Office of
Research and Development, EPA-600/R-09/151, December 2009.
Kosson, D.S., H.A. van der Sloot, F. Sanchez and A.C. Garrabrants (2002) "An integrated
framework for evaluating leaching in waste management and utilization of secondary materials,"
Environmental Engineering Science, 19(3 ): 15 9-204.
Lopez Meza, S., A.C. Garrabrants, H. van der Sloot and D.S. Kosson (2008) "Comparison of the
release of constituents from granular materials under batch and column testing," Waste
Management, 28(10): 1853-1867.
NRC (2006) Managing Coal Combustion Residues in Mines, Washington, DC, The National
Academy Press, 256 pp.
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Sanchez, F., R. Keeney, D.S. Kosson and R. DeLapp (2006) Characterization of Mercury-
Enriched Coal Combustion Residues from Electric Utilities using Enhanced Sorbents for
Mercury Control, Washington DC, U.S. Environmental Protection Agency, Office of Research
and Development, EPA-600/R-06/008, February 2006.
Sanchez, F., D.S. Kosson, R. Keeney, R. DeLapp, L.H. Turner and P. Kariher (2008)
Characterization of Coal Combustion Residues from Electric Utilities using Wet Scrubbers for
Multi-Pollutant Control, Washington DC, U.S. Environmental Protection Agency, Office of
Research and Development, EPA-600/R-08/077, July 2008.
Susset, B. and P. Grathwohl (2009) Ruggedness Testing to Develop a Practicable Percolation
Upflow Test (National Standard DIN 19528), WASCON 2009: Sustainable Management of
Waste and Recycled Materials in Construction, Lyon, France.
Susset, B., W. Leuchs and P. Grathwohl (2009) Derivation of Leaching Standards - A
Regulatory Concept for the Upcoming German Federal Decree for the Use of Mineral Waste
Materials and By-products, WASCON 2009: Sustainable Management of Waste and Recycled
Materials in Construction, Lyon, France.
Thorneloe, S.A., D.S. Kosson, G. Helms and A.C. Garrabrants (2009) Improved leaching test
methods for environmental assessment of coal ash and recycled materials used in construction, In
the proceedings of the Twelfth International Waste Management and Landfill Symposium, S.
Margherita di Pula (Cagliari), Sardinia, Italy, 5-9 October 2009.
Thorneloe, S.A., D.S. Kosson, F. Sanchez, A.C. Garrabrants and G. Helms (2010) "Evaluating
the Fate of Metals in Air Pollution Control Residues from Coal-Fired Power Plants,"
Environmental Science and Technology DOI: 10.1021/esl016558.
U.S. EPA (1988) Report to Congress - Wastes from the Combustion of Coal by Electric Utility
Power Plants, Washington, DC, EPA Office of Solid Waste and Emergency Response,
EPA/530-SW-88-002.
U.S. EPA (1991) Leachability Phenomena: Recommendations and Rationale for Analysis of
Contaminant Release by the Environmental Engineering Committee, Washington, DC, USEPA
Science Advisory Board, EPA-SAB-EEC-92-003.
U.S. EPA (1999a) Report to Congress - Wastes form the Combustion of Fossil Fuels: Volume 2 -
Methods, Findings and Recommendations, Washington, DC, EPA Office of Solid Waste and
Emergency Response, EPA/53O-R-99-010.
U.S. EPA (1999b) Waste Leachability: The Need for Review of Current Agency Procedures,
Washington, DC, USEPA Science Advisory Board, EPA-SAB-EEC-COM-99-002.
U.S. EPA (2003) TCLP Consultation Summary, EPA Science Advisory Board, Environmental
Engineering Committee Consultation with U.S. Environmental Protection Agency, EPA SAB
EEC, Washington, DC.
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van der Sloot, H.A. (2002a) "Developments in testing for environmental impact assessment,"
Waste Management, 22(7): 693-694.
van der Sloot, H.A. (2002b) Harmonization of leaching/extraction procedures for sludge,
compost, soil and sediment analyses., Methodologies for Soil and Sediment Fractionation
Studies, Quevauviller, P. (Ed.), Royal Society of Chemistry, London: 142-170.
van der Sloot, H.A., JJ. Dijkstra, B. Susset, O. Hjelmar, D. Kosson, A.C. Garrabrants, U. Kalbe,
J. Mehu, L. van Galen and B. Schnuriger (2010) "Evaluation of Ruggedness Testing Needs for
Percolation Tests, pH-dependence Leaching Tests, and Monolithic Leaching Tests (Interim
Draft)," Intercomparison Validation to Obtain Performance Data, CEN - The European
Committee for Standardization, available at www.vanderbilt.edu/leaching/pubsAssessment.html.
van der Sloot, H.A., L. Heasman and P. Quevauviller (1997) Harmonization of
Leaching/Extraction Test, Elsevier Science, Amsterdam.
van der Sloot, H.A., O. Hjelmar, J. Bjerre Hansen, P. Woitke, P. Lepom, R. Leschber, B. Bartet
and N. Debrucker (2001) Validation ofCEN/TC 292 Leaching Test andEluate Analysis Methods
PrEN 12457part 1-4, ENV13370 andENV 12506, CEN/TC 292 in cooperation with CEN/TC
308, ECN-C-01-117.
van der Sloot, H.A. and D.S. Kosson (2007) "Benefits of a tiered approach in environmental
testing, analysis, modelling and defining regulatory criteria," Waste Management, 27(11): 1477-
1478.
van der Sloot, H.A., P.F.A.B. Seignette, J.C.L. Meeussen, O. Hjelmar and D.S. Kosson (2008) A
database, speciation modeling and decision support tool for soil, sludge, sediments, wastes and
construction products: LeachXS™-ORCHESTRA, Venice 2008 - Second International
Symposium on Energy from Biomass and Waste, Venice, Italy.
van der Sloot, H.A., A. van Zomeren, J.C.L. Meeussen, P. Seignette and R. Bleijerveld (2007)
"Test method selection, validation against field data, and predictive modelling for impact
evaluation of stabilised waste disposal," Journal of Hazardous Materials, 141(2): 354-369.
Wolt, J.D. (1994) Soil Science Chemistry: Applications in Environmental Science and
Agriculture, John Wiley & Sons, Inc, New York.
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APPENDIX A
METHOD 1313 (R2)-
LIQUID-SOLID PARTITIONING AS A FUNCTION OF EXTRACT pH
IN SOLID MATERIALS USING A PARALLEL BATCH PROCEDURE
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PRELIMINARY VERSION1 OF METHOD 1313
LIQUID-SOLID PARTITIONING AS A FUNCTION OF EXTRACT pH IN SOLID MATERIALS
USING A PARALLEL BATCH PROCEDURE
SW-846 is not intended to be an analytical training manual. Therefore, method
procedures are written based on the assumption that they will be performed by analysts who are
formally trained in at least the basic principles of chemical analysis and in the use of the subject
technology.
In addition, SW-846 methods, with the exception of required method use for the analysis
of method-defined parameters, are intended to be guidance methods which contain general
information on how to perform an analytical procedure or technique which a laboratory can use
as a basic starting point for generating its own detailed Standard Operating Procedure (SOP),
either for its own general use or for a specific project application. The performance data
included in this method are for guidance purposes only, and are not intended to be and must not
be used as absolute quality control (QC) acceptance criteria for purposes of laboratory
accreditation.
1.0 SCOPE AND APPLICATION
1.1 This method is designed to provide aqueous extracts representing the liquid-
solid partitioning (LSP) curve as a function of pH for inorganic constituents (e.g., metals and
radionuclides), semi-volatile organic constituents (e.g., polycyclic aromatic hydrocarbons or
PAHs) and non-volatile organic constituents (e.g., dissolved organic carbon) in solid materials.
The LSP curve is evaluated as a function of final extract pH at a liquid-to-solid ratio (L/S) of 10
mL extractant/g dry sample (g-dry) and conditions that approach liquid-solid chemical
equilibrium. This method also yields the acid/base titration and buffering capacity of the tested
material at an L/S of 10 mL extractant/g-dry sample. The analysis of extracts for dissolved
organic carbon and the solid phase for total organic carbon allow for the evaluation of the
impact of organic carbon release and the influence of dissolved organic carbon on the LSP of
inorganic constituents.
1.2 This method is intended to be used as part of an environmental leaching
assessment for the evaluation of disposal, beneficial use, treatment effectiveness and site
remediation options.
1.3 This method is suitable for a wide range of solid materials. Examples of solid
materials include: industrial wastes, soils, sludges, combustion residues, sediments, stabilized
materials, construction materials, and mining wastes.
1.4 This method is a leaching characterization method that is used to provide
values for intrinsic material parameters that control leaching of inorganic and some organic
1 Preliminary Version denotes that this method has not been endorsed by EPA but is under consideration
for inclusion into SW-846. This method has been derived from published procedures (Kosson et al, 2002)
using reviewed and accepted methodologies (U.S. EPA2006, 2008, 2009). The method has been
submitted to the U.S. EPAOffice of Resource Conservation and Recovery and is currently under review
for development of interlaboratory validation studies to develop precision and bias information.
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species under equilibrium conditions. This test method is intended as a means for obtaining a
series of extracts of a solid material (i.e., the eluates), which may be used to estimate the LSP
(e.g., solubility and release) of constituents as a function of pH under the laboratory conditions
described in the method. Eluate constituent concentrations may be used in conjunction with
information regarding environmental management scenarios to estimate the anticipated
leaching concentrations, release rate and extent for individual material constituents under the
management to be evaluated. Eluate constituent concentrations generated by this method may
also be used along with geochemical speciation modeling to infer the mineral phases that
control the LSP in the pore structure of the solid material.
1.5 This method is not applicable for characterizing the release of volatile organic
analytes (e.g., benzene, toluene, xylenes).
1.6 The relationships between eluate concentrations observed from this method
and field leachate must be considered in the context of the material being tested and the field
scenario being evaluated. This method provides solutions considered indicative of eluate under
field conditions, only where the field leaching pH is the same as the final laboratory extract pH
and the LSP is controlled by aqueous phase saturation of the constituent of interest.
1.7 The maximum mass of constituent released over the range of method pH
conditions (2 < pH < 13) may be considered an estimate of the maximum mass of the
constituent leachable under field leaching conditions for intermediate time frames and the
domain of the laboratory test pHs.
1.8 The solvents used in this method include dilute solutions of nitric acid (HMOs)
and potassium hydroxide (KOH) in reagent water.
1.9 Analysts are advised to take reasonable measures to ensure that the sample is
homogenized to the extent practical, prior to employment of this method. Particle-size reduction
may provide additional assurance of sample homogenization and also facilitate achievement of
equilibrium during the test procedure. Table 1 of this standard designates a recommended
minimum dry mass of sample to be added to each extraction vessel and the associated
extraction contact time as a function of particle diameter. If the heterogeneity of the sample is
suspected as the cause of unacceptable precision in replicate test results or is considered
significant based on professional judgment, the sample mass used in the test procedure may be
increased to a greater minimum dry mass than that shown in Table 1 with the amount of
extractant increased proportionately to maintain the designated L/S.
1.10 In the preparation of solid materials for use in this method, particle-size
reduction of samples with a large grain size is performed in order to enhance the approach
towards equilibrium under the designated contact time interval of the extraction process. The
extract contact time for samples reduced to a finer maximum particle size will consequently be
shorter (see Table 1).
1.11 Prior to employing this method, analysts are advised to consult the base
method for each type of procedure that may be employed in the overall analysis (e.g., Methods
9040, 9045, and 9050, and the determinative methods for the target analytes), QC acceptance
criteria, calculations, and general guidance. Analysts also should consult the disclaimer
statement at the front of the manual and the information in Chapter Two for guidance on the
intended flexibility in the choice of methods, apparatus, materials, reagents, and supplies, and
on the responsibilities of the analyst for demonstrating that the techniques employed are
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appropriate for the analytes of interest, in the matrix of interest, and at the concentration levels
of concern.
In addition, analysts and data users are advised that, except where explicitly specified in
a regulation, the use of SW-846 methods is not mandatory in response to Federal testing
requirements. The information contained in this method is provided by EPA as guidance to be
used by the analyst and the regulated community in making judgments necessary to generate
results that meet the data quality objectives for the intended application. Guidance on defining
data quality objectives can be obtained at http://www.epa.gov/QUALITY/qs-docs/g4-final.pdf
1.12 Use of this method is restricted to use by, or under supervision of, properly
experienced and trained personnel. Each analyst must demonstrate the ability to generate
acceptable results with this method.
2.0 SUMMARY OF METHOD
This method consists of parallel extractions of a particle size-reduced solid material in
dilute acid or base and reagent water. A flowchart for performing this method is shown in Figure
1. Particle-size reduction of the material to be tested is performed according to Table 1. A
schedule of acid and base additions is formulated from a pre-test titration curve or prior
knowledge indicating the required amount of acid or base (equivalents/g) to be added to a
series of extraction vessels so as to yield a series of eluates with final pH at nine specified
target pH values in the range of 2-13. Extraction at natural conditions (e.g., extraction with
regeant water only at a liquid-solid ratio of 10 mL/g-dry) may be used to substitute for a
specified target pH if the natural pH falls within the acceptable tolerance for any of the nine
specified target pH values. If the natural pH does not fall with any acceptable tolerance, an
additional extraction vessel is required to conduct an extraction at natural pH conditions. In
addition to the test position extractions, three method blanks without solid sample are carried
through the procedure in order to verify that analyte interferences are not introduced as a
consequence of reagent impurities or equipment contamination. The extraction bottles (i.e.,
eight or nine test positions, natural pH, and three method blanks) are tumbled in an end-over-
end fashion for a specified contact time, which depends on the particle size of the sample (see
Table 1). At the end of the specified contact interval, the liquid and solid phases are roughly
separated via settling or centrifugation. Eluate pH and specific conductivity measurements are
then made on an aliquot of the liquid phase and the remaining bulk of the eluate is clarified by
either pressure or vacuum filtration. In cases where rough separation is not practical or results
in grossly incomplete clarification, eluate measurements may be taken immediately following
filtration. Analytical samples of the filtered eluate are collected and preserved as appropriate for
the desired chemical analyses. The eluate concentrations of constituents of potential concern
(COPCs) are determined and reported. In addition, COPC concentrations may be plotted as a
function of eluate pH and compared to quality control and assessment limits for the
interpretation of method results.
3.0 DEFINITIONS
3.1 COPC — A chemical species of interest, which may or may not be regulated,
but may be characteristic of release-controlling properties of the sample geochemistry.
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3.2 Release — The dissolution or partitioning of a COPC from the solid phase to
the aqueous phase during laboratory testing (or under field conditions). In this method, mass
release is expressed in units of mg COPC/kg dry solid material.
3.3 LSP — The distribution of COPCs between the solid and liquid phases at the
conclusion of the extraction.
3.4 L/S — The fraction of the total liquid volume (including the moisture contained
in the "as used" solid sample) to the dry mass equivalent of the solid material. L/S is typically
expressed in volume units of liquid per dry mass of solid material (mL/g-dry).
3.5 "As-tested" sample — The solid sample at the conditions (e.g., moisture content
and particle-size distribution) present at the time of the start of the test procedure. The "as-
tested" conditions will differ from the "as-received" sample conditions if particle-size reduction
and drying were necessarily performed.
3.6 Dry-mass equivalent — The mass of "as-tested" (i.e., "wet") sample that
equates to the mass of dry solids plus associated moisture, based on the moisture content of
the "as-tested" material. The dry-mass equivalent is typically expressed in mass units of the
"as-tested" sample (g).
3.7 Refer to the SW-846 chapter of terms and acronyms for potentially applicable
definitions.
4.0 INTERFERENCES
4.1 Solvents, reagents, glassware, and other sample processing hardware may
yield artifacts and/or interferences to sample analysis. All of these materials must be
demonstrated to be free from interferences under the conditions of the analysis by analyzing
method blanks. Specific selection of reagents and purification of solvents by distillation in all-
glass systems may be necessary. Refer to each method to be used for specific guidance on
quality control procedures and to Chapters Three and Four for general guidance on the cleaning
of laboratory apparatus prior to use.
4.2 If potassium is a COPC, the use of KOH as a base reagent will interfere with
the determination of actual potassium release. In this case, sodium hydroxide (NaOH) of the
same grade and normality may be used as a substitute.
5.0 SAFETY
5.1 This method does not address all safety issues associated with its use. The
laboratory is responsible for maintaining a safe work environment and a current awareness file
of OSHA regulations regarding the safe handling of the chemicals listed in this method. A
reference file of material safety data sheets (MSDSs) should be available to all personnel
involved in these analyses.
5.2 During preparation of extracts and processing of extracts, some waste
materials may generate heat or evolve potentially harmful gases when contacted with acids and
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bases. Adequate prior knowledge of the material being tested should be used to establish
appropriate personal protection and workspace ventilation.
6.0 EQUIPMENT AND SUPPLIES
The mention of trade names or commercial products in this manual is for illustrative
purposes only, and does not constitute an EPA endorsement or exclusive recommendation for
use. The products and instrument settings cited in SW-846 methods represent those products
and setting used during the method development or subsequently evaluated by the Agency.
Glassware, reagents, supplies, equipment, and settings other than those listed in this manual
may be employed provided that method performance appropriate for the intended application
has been demonstrated and documented. This section does not list common laboratory
glassware (e.g., beakers and flasks) which nonetheless may be required to perform the method.
6.1 Extraction vessels
6.1.1 Twelve wide-mouth bottles (i.e., nine for test positions plus three for
method blanks) constructed of inert material, resistant to high and low pH values and
interaction with COPCs as described in the following sections.
NOTE: Depending on the value of the natural pH (determined from prior knowledge or
the results of the pre-test titration), thirteen extraction bottles may be necessary
per test replicate.
6.1.1.1 For the evaluation of inorganic COPC mobility, bottles
made of high density polyethylene (HOPE) (e.g., Nalgene #3140-0250 or
equivalent), polypropylene (PP), or polyvinyl chloride (PVC) are recommended.
6.1.1.2 For the evaluation of non-volatile organic and mixed
organic/inorganic COPC mobility, bottles made of glass or Type 316 stainless
steel are recommended. Polytetrafluoroethylene (PTFE) is not recommended
for non-volatile organics due to the sorption of species with high hydrophobicity
(e.g., PAHs). Borosilicate glass is recommended over other types of glass,
especially when inorganic analytes are of concern.
6.1.2 The extraction vessels must be of sufficient volume to
accommodate both the solid sample and an extractant volume, based on an L/S of 10 ±
0.5 mL extractant/g-dry. The head space in the bottle should be minimized to the extent
possible when semi-volatile organics are COPCs. For example, Table 1 indicates that
250-mL volume bottles are recommended when the minimum 20 g-dry mass equivalent
is contacted with 200 mL of extractant.
6.1.3 The vessel must have a leak-proof seals that can sustain end-over-
end tumbling for the duration of the designated contact time.
6.1.4 If centrifugation is anticipated to be beneficial for initial phase
separation, the extraction vessels should be capable of withstanding centrifugation at
4000 ± 100 rpm for a minimum of 10 ± 2 min. Alternately, samples may be extracted in
bottles that do not meet this centrifugation specification (e.g., Nalgene l-Chem #311-
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0250 or equivalent) and the solid-liquid slurries transferred into appropriate
centrifugation vessels for phase separation as needed.
6.2 Balance — Capable of 0.01-g resolution for masses less than 500 g.
6.3 Rotary tumbler — Capable of rotating the extraction vessels in an end-over-end
fashion at a constant speed of 28 ± 2 rpm (e.g., Analytical Testing, Werrington, PA or
equivalent).
6.4 Filtration apparatus — Pressure or vacuum filtration apparatus composed of
appropriate materials so as to maximize the collection of extracts and minimize loss of the
COPCs (e.g., Nalgene #300-4000 or equivalent) (see Sec. 6.1).
6.5 Filtration membranes — Composed of polypropylene or equivalent material with
an effective pore size of 0.45-um (e.g., Gelman Sciences GH Polypro #66548 from Fisher
Scientific or equivalent).
6.6 pH Meter — Laboratory model with the capability for temperature compensation
(e.g., Accumet 20, Fisher Scientific or equivalent) and a minimum resolution of 0.1 pH units.
6.7 pH combination electrode — Composed of chemically-resistant materials.
6.8 Conductivity meter — Laboratory model (e.g., Accumet 20, Fisher Scientific or
equivalent), with a minimum resolution of 5% of the measured value.
6.9 Conductivity electrodes — Composed of chemically-resistant materials.
6.10 Adjustable-volume pipettor — Oxford Benchmate series or equivalent. The
necessary delivery range will depend on the buffering capacity of the solid material and
acid/base strength used in the test.
6.11 Disposable pipettor tips.
6.12 Centrifuge (recommended) — Capable of centrifuging the extraction vessels at
a rate of 4000 ± 100 rpm for 10 ± 2 min.
7.0 REAGENTS AND STANDARDS
7.1 Reagent-grade chemicals must be used in all tests. Unless otherwise
indicated, it is intended that all reagents conform to the specifications of the Committee on
Analytical Reagents of the American Chemical Society, where such specification are available.
Other grades may be used, provided it is first ascertained that the reagents are of sufficiently
high purity to permit use without lessening the accuracy of the determination. Inorganic
reagents and extracts should be stored in plastic to prevent interaction of constituents from
glass containers.
7.2 Reagent water must be interference free. All references to water in this method
refer to reagent water unless otherwise specified.
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7.3 Nitric acid (2.0 N), HNO3 - Trace-metal grade or better, purchased at strength
or prepared by diluting concentrated nitric acid with reagent water. Solutions with alternate
normality may be used as necessary. In such cases, the amounts of HMOs solution added to
samples should be adjusted based on the equivalents required in the schedule of acid/base
additions (see Sec. 11.4).
7.4 Potassium hydroxide (1.0 N), KOH -ACS grade, purchased at strength or
prepared by diluting concentrated potassium hydroxide solution with reagent water, or otherwise
by dissolving 56.11 g of solid potassium hydroxide in 1 L of reagent water. Solutions with
alternate normality may be used as necessary. In such cases, the amounts of KOH solution
added to samples should be adjusted based on the equivalents required in the schedule of
acid/base additions (see Sec. 11.4).
7.5 Consult Methods 9040, 9045 and 9050 for additional information regarding the
preparation of reagents required for pH and specific conductance measurements.
8.0 SAMPLE COLLECTION, PRESERVATION, AND STORAGE
8.1 See the introductory material to Chapter Three "Inorganic Analytes" and
Chapter Four "Organic Analytes."
8.2 All samples should be collected using an appropriate sampling plan.
8.3 All analytical sample containers should be composed of materials that minimize
interaction with solution COPCs. For further information, see Chapters Three and Four.
8.4 Preservatives should not be added to samples before extraction.
8.5 Samples can be refrigerated, unless refrigeration results in an irreversible
physical change to the sample.
8.6 Analytical samples should be preserved according to the guidance given in the
individual determinative methods for the COPCs.
8.7 Extract holding times should be consistent with the aqueous sample holding
times specified in the determinative methods for the COPCs.
9.0 QUALITY CONTROL
9.1 Refer to Chapter One for guidance on quality assurance (QA) and quality
control (QC) protocols. When inconsistencies exist between QC guidelines, method-specific
QC criteria take precedence over both technique-specific criteria and those criteria given in
Chapter One, and technique-specific QC criteria take precedence over the criteria in Chapter
One. Any effort involving the collection of analytical data should include development of a
structured and systematic planning document, such as a Quality Assurance Project Plan
(QAPP) or a Sampling and Analysis Plan (SAP), which translates project objectives and
specifications into directions for those that will implement the project and assess the results.
Each laboratory should maintain a formal quality assurance program. The laboratory should
also maintain records to document the quality of the data generated. All data sheets and quality
control data should be maintained for reference or inspection.
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9.2 In order to demonstrate the purity of reagents and sample contact surfaces,
method blanks should be tested at the extremes of the acid and base additions, as well as when
only reagent water (no acid or base addition) is used for extraction.
9.3 The analysis of extracts should follow appropriate QC procedures, as specified
in the determinative methods for the COPCs. Refer to Chapter One for specific quality control
procedures.
9.4 Solid materials should be tested within one month of receipt unless the project
requires that the "as-received" samples are tested sooner (e.g., the material is part of a time-
dependent study or the material may change during storage due to oxidation or carbonation).
10.0 CALIBRATION AND STANDARDIZATION
10.1 The balance should be calibrated and certified at a minimum annually or in
accordance with laboratory policy.
10.2 Prior to measurement of eluate pH, the pH meter should be calibrated using a
minimum of two standards that bracket the range of pH measurements. Refer to Methods 9040
and 9045 for additional guidance.
10.3 Prior to measurement of eluate conductivity, the meter should be calibrated
using at least one standard at a value greater than the range of conductivity measurements.
Refer to Method 9050 for additional guidance.
11.0 PREPARATORY PROCEDURES
A flowchart for the method procedure is presented in Figure 1.
11.1 Particle-size reduction (if required)
11.1.1 In this method, particle-size reduction is used for sample
homogenization and to prepare large-grained samples for extraction so that the
approach toward liquid-solid equilibrium is enhanced and mass transport through large
particles is minimized. A longer extract contact time is required for larger maximum
particle-size designations. This method designates three maximum particle sizes and
associated contact times (see Table 1). The selection of an appropriate maximum
particle size from this table should be based on professional judgment regarding the
practical effort required to size-reduce the solid material.
11.1.2 Particle-size reduction of "as received" samples may be achieved
through crushing, milling or grinding with equipment made from chemically-inert
materials. During the reduction process, care should be taken to minimize the loss of
sample and potentially volatile constituents in the sample.
11.1.3 If the moisture content of the "as received" material is greater than
15% (wet basis), air drying or desiccation may be necessary. Oven drying is not
recommended for the preparation of test samples due to the potential for mineral
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alteration and volatility loss. In all cases, the moisture content of the "as received"
material should be recorded.
NOTE: If the solid material is susceptible to interaction with the atmosphere (e.g.,
carbonation, oxidation), drying should be conducted in an inert environment.
11.1.4 When the material appears to be of a relatively uniform particle size,
calculate the percentage less than the sieve size as follows:
% Passing = Msieved x100%
Where: Msieved = mass of sample passing the sieve (g)
Mtotai = mass of total sample (g) (e.g., Msieved + mass not passing sieve)
11.1.5 The fraction retained by the sieve should be recycled for further
particle-size reduction until at least 85% of the initial mass has been reduced below the
designated maximum particle size. Calculate and record the final percentage passing
the sieve and the designated maximum particle size. For the uncrushable fraction of the
"as received" material, record the fraction mass and nature (e.g., rock, metal or glass
shards, etc).
11.1.6 Store the size-reduced material in an airtight container in order to
prevent contamination via gas exchange with the atmosphere. Store the container in a
cool, dark and dry place prior to use.
11.2 Determination of solids and moisture content
11.2.1 In order to provide the dry mass equivalent of the "as-tested"
material, the solids content of the subject material should be determined. Often, the
moisture content of the solid sample is recorded. In this method, the moisture content is
determined and recorded on the basis of the "wet" or "as-tested" sample.
WARNING: The drying oven should be contained in a hood or otherwise properly
ventilated. Significant laboratory contamination or inhalation hazards may
result when drying heavily contaminated samples. Consult the laboratory
safety officer for proper handling procedures prior to drying samples that
may contain volatile, hazardous, flammable or explosive materials.
11.2.2 Place a 5-10-g sample of solid material into a pre-tared dish or
crucible. Dry the sample to a constant mass at 105 ± 2 °C. Periodically check the
sample mass after allowing the sample to cool to room temperature (20 ± 2 °C) in a
desiccator.
NOTE: The oven-dried sample is not used for the extraction and should be properly
disposed of once the dry mass is determined.
11.2.3 Calculate and report the solids content as follows:
1313-9 Revision 2
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80 -
test
Where: SC = solids content (g-dry/g)
Mdry = mass of oven-dried sample (g-dry)
Mtest = mass of "as-tested" sample (g)
11.2.4 Calculate and report the moisture content (wet basis) as follows:
Mtest - Mdry
M
'test
Where: MC(wet) = moisture content on a wet basis (gH2o/g)
Mdry = mass of oven-dried sample (g-dry)
Mtest = mass of "as-tested" sample (g)
11.3 Pre-test titration (if required)
In order to conduct the parallel batch test in Sec. 12.0, a schedule of acid and base
additions should be formulated from either a pre-test titration or based on prior knowledge of the
acid/base titration curve of the sample. This section describes the procedure for obtaining a
titration curve of the test material, when sufficient prior knowledge is unavailable.
If the schedule of acid and base additions will be generated from prior knowledge,
proceed to Sec. 11.4. If the schedule of acid and base additions is already known, proceed to
Sec. 12.0.
Figures 2-4 show example titration curves for a wide variety of solid materials. Table 2
indicates how these materials may be classified as (a) low alkalinity; (b) moderate alkalinity; or
(c) high alkalinity in terms of the equivalents of acid required for obtaining final extraction pH
values in the range of 2-13.
11.3.1 Predict the classification of the neutralization behavior of the solid
material based on professional judgment, preliminary data, or the material examples
shown in Table 2 and Figures 2-4.
11.3.2 Conduct a five-point parallel extraction test using 10-g-dry samples
of the solid following the pre-test schedule shown in Table 3 for the chosen
classification. One position in the five-point pre-test must be an extraction under natural
test conditions (e.g., extraction with reagent water only at liquid-solid ratio of 10 ml_/g-
dry). Perform the extraction following the procedure in Sec. 12.0, omitting the filtration,
method blanks, and analytical sample collection.
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11.3.3 Plot the pre-test titration curve (e.g., the extract pH as a function of
the equivalents of acid added) considering base equivalents as the negative sign of acid
equivalents.
11.3.4 If a higher resolution in the titration curve is desired in order to
determine intermediate acid/base additions for all target pH values, reiterate the pre-test
extraction until the 2-13 pH range can be resolved.
NOTE: Additional pre-test point(s) interpolating or extrapolating from the pre-test
schedule may be necessary to provide adequate resolution in the titration curve.
11.3.5 Pre-test titration using provided Microsoft® Excel template
The "Pre-Test" worksheet in the provided Excel template may be used to
calculate pre-test extraction formulations and plot the pre-test titration curve. Mandatory
input data for the template includes:
a) particle size of the "as tested" material (see Sec. 11.1);
b) solids content of the "as tested" material (see Sec. 11.2); and
c) five acid/base additions based on the predicted response classification of the
solid material (see Sec. 11.3).
Enter the eluate pH and plot the pre-test titration curve. Compare the resulting titration
curve to the target pH values as designated in Table 4.
11.4 Formulation of acid and base additions schedule
A schedule of acid and base additions is used in the main extraction procedure (Sec.
12.0) to set up nine extractions of the test material plus three method blanks. Based on either
prior knowledge of the acid/base titration curve of the sample or the results of the pre-test
titration procedure in Sec. 11.3, formulate a schedule of test extractions using the example in
Table 4 and the following steps.
11.4.1 Using the extraction parameters in Table 1, identify the
recommended minimum dry-mass equivalent associated with the particle size of the "as-
tested" sample. Calculate and record the amount of "as tested" material equivalent to
the dry-material mass from Table 1 as follows:
"test - -g£-
Where: Mtest = mass of "as-tested" solid equivalent to the dry-material mass (g)
Mdry = mass of dry material specified in the method (g-dry)
SC = solids content of "as-tested" material (g-dry/g)
11.4.2 Label Column A of the schedule table with consecutive numbers for
the nine test positions (shown in Table 4 as "TXX" labels) and three method blanks
(shown in Table 4 as "BXX" labels).
1313-11 Revision 2
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11.4.3 Copy the nine target pH points as shown in Table 5 and enter this
data into Column B of the schedule table. The natural pH value (e.g., pH resulting from
extraction with reagent water only at L/S 10) may be used as a substitute for a test
position pH value if it falls within the tolerance of the specified target pH. For example, if
the natural pH is 11.8 and would satisfy the target pH of 12.0 ± 0.5, the extraction at
natural conditions would be conducted and the specified target point of 12.5 ± 0.5 would
be removed from Table 5.
11.4.4 For each test position, determine the equivalents of acid or base
required to meet the target pH from the pre-test titration curve (see Sec. 11.3). Enter
this data into Column C of the schedule table. Interpolate intermediate acid additions on
the pre-test titration curve using linear interpolation or other regression techniques.
NOTE: Linear interpolation will have some inherent error, which may result in an extract
pH that falls outside of the target pH tolerance. Additional pre-test points
interpolating or extrapolating from the pre-test schedule in Table 3 may be
necessary to provide adequate resolution of the titration curve.
11.4.5 Enter the acid volumes in Column D and base volumes in Column E
of the schedule after converting the equivalents of acid and base to volume as follows:
V -Eqa/b
va/b - ~T,
Na/b
Where: Va/b = volume of acid or base to be entered in the schedule table (ml)
Eqa/b = equivalents of acid or base selected for the target pH as
determined from the pre-test titration curve (meq/g)
Na/b = normality of the acid or base solution (meq/mL)
11.4.6 In Column F of the schedule table, calculate the volume of moisture
contained in the "as tested" sample as follows:
Mtestx(l-SC)
vW,sample ~
PIN
Where: Vw,Sampie = volume of water in the "as tested" sample (ml)
Mtest = mass of the "as tested" sample (g)
SC = solids content of the "as tested" sample (g-dry/g)
pw = density of water (1.0 g/mL at room temperature)
11.4.7 In Column G of the schedule table, calculate the volume of reagent
water required to bring each extraction to an L/S of 10 mL/g-dry solid as follows:
1313-12 Revision 2
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VRW = Mdry X LS - VWiSampte - Va/b
Where: VRW = volume of reagent water required to complete L/S (ml)
Mdry = dry mass equivalent of solid sample (g)
L/S= liquid-to-dry-solid ratio (10 ml_/g)
Vw.sampie = volume of water in "as used" sample (ml)
Va/b = volume of acid or base for the extraction recipe (ml)
11.4.8 Method Blanks
In the schedule table, include three additional extractions for processing
method blanks. Method blanks extractions are performed using the same equipment,
reagents, and extraction process as the test positions, but without solid sample. The
three method blanks should include:
a) reagent water (B01 in Table 4);
b) reagent water + maximum volume of acid in the schedule (B02 in Table 4);
and
c) reagent water + maximum volume of base in the schedule (BOS in Table 4).
NOTE: If multiple materials or replicate tests are carried out in parallel, only one set of
method blanks is necessary.
11.4.9 Schedule formulation using Excel template
The "Test Data" worksheet in the provided Excel template may be used to
automatically calculate a schedule of acid and base additions, as well as to plot the
response eluate pH and conductivity as a function of acid addition. Mandatory input
data for the template includes:
a) particle size of the "as tested" material (see Sec. 11.1);
b) solid content of the "as tested" material (see Sec. 11.2); and
c) nine acid/base additions determined from the pre-test titration curve with
respect to target pH values designated in Table 5.
Subsequent to the extraction procedure, eluate pH, conductivity, and oxidation/reduction
potential (optional) for up to three replicates may be entered and plotted as a function of acid
added.
12.0 EXTRACTION PROCEDURE
Use the schedule of acid and base additions (Sec. 11.4) as a guide to set up nine test
extractions and three method blanks as follows:
12.1 Label bottles with test position and method blank numbers according to the
schedule of acid and base additions (see Column A in Table 4).
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12.2 Use the extraction parameters in Table 1 to identify the recommended dry-
mass equivalent associated with the particle size of the "as tested" sample. Calculate and
record the amount of "as tested" material equivalent to the identified dry mass from Table 1 as
follows:
M
Mtest
sc
Where: Mtest = mass of "as tested" solid equivalent to g of dry material (g)
Mdry = mass of dry material specified in method (g)
SC = solids content of "as tested" material (g/g)
12.3 Place the dry equivalent mass (± 0.1 g) of the "as tested" sample, calculated
above, into each of the test position extraction vessels.
NOTE: Do NOT put solid material in the method blank extraction vessels.
12.4 Add the appropriate volume of reagent water (± 5% of target value) to both the
test position and method blank extraction vessels, as specified in the schedule for the L/S
makeup (see Column G in Table 4).
12.5 Add the appropriate volume of acid or base (± 1% of target value) to each
vessel, using a continuously adjustable pipettor, as designated in the schedule for acid/base
addition (see Column D and Column E in Table 4).
12.6 Tighten the leak-proof lid on each bottle and tumble all extractions
(i.e., test positions and method blanks) in an end-over-end fashion at a speed of 28 ± 2
rpm at room temperature (20 ± 2 °C). The contact time for this method will vary depending on
the sample particle size as shown in Table 1.
NOTE: The length of the contact time is designed to enhance the approach toward liquid-solid
equilibrium. Longer contact times are required for larger particles to compensate for the
effects of intra-particle diffusion. See Table 1 for recommended contact times based on
particle size.
12.7 Remove the extraction vessels from the rotary tumbler and clarify the
extractants by allowing the bottles to stand for 15 ± 5 min. Alternately, centrifuge the extraction
vessels at 4000 ± 100 rpm for 10 ± 2 min.
NOTE: If clarification is significantly incomplete after settling or centrifugation, eluate
measurements for pH, conductivity, and oxidization-reduction potential (ORP) may be
taken on filtered samples. In this case, perform the filtration in 12.9 prior to eluate
measurement in 12.8 and note the deviation from the written procedure.
CAUTION: Following separation from the solid phase, eluate samples lack the buffering
provided by the solid phase and therefore may be susceptible to pH change
resulting from interaction with air.
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12.8 For each extract vessel, decant a minimum volume (~ 5 ml_) of clear,
unpreserved supernatant into a clean container. Measure and record the pH, specific
conductivity, and oxidation-reduction potential (optional, but strongly recommended) of the
extracts (see Methods 9040, 9045, and 9050).
NOTE: Eluate measurements for pH, conductivity, and ORP should be taken as soon as
possible after the settling and preferably within 1 hour after completion of tumbling
(12.6).
12.9 Separate the solid from the remaining liquid in each extraction vessel by
pressure or vacuum filtration through a clean 0.45-um pore size membrane (Sec. 6.5). The
filtration apparatus may be exchanged for a clean apparatus as often as necessary until all
liquid has been filtered.
NOTE: If it is suspected that COPCs (e.g., mercury) might be lost under vacuum, the samples
may be pressure-filtered using an inert gas (e.g., nitrogen or argon).
12.10 Immediately, preserve and store the volume(s) of eluate required for chemical
analysis. Preserve all analytical samples in a manner that is consistent with the determinative
chemical analyses to be performed.
13.0 DATA ANALYSIS AND CALCULATIONS (EXCEL TEMPLATE PROVIDED)
13.1 Data reporting
13.1.1 Figure 5 shows an example of a data sheet that may be used to
report the concentration results of this method. This example is included in the Excel
template. At a minimum, the basic test report should include:
a) Name of the laboratory
b) Laboratory technical contact information
c) Date at the start of the test
d) Name or code of the solid material
e) Particle size (85 wt% less than)
f) Type of acid and/or base used in test
g) Extraction contact time (h)
h) Ambient temperature during extraction (°C)
i) Eluate specific information (see Sec. 13.1.2 below)
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13.1.2 The minimum set of data that should be reported for each eluate
includes:
a) Eluate sample ID
b) Mass of "as tested" solid material used (g)
c) Moisture content of material used (gH2o/9)
d) Volume (ml_) and normality (N) of acid and/or base used
e) Volume of water added (ml_)
f) Target pH
g) Measured final eluate pH
h) Measured eluate conductivity (mS/cm)
I) Measured ORP (mV) (optional)
j) Concentrations of all COPCs
k) Analytical QC qualifiers as appropriate
13.2 Data interpretation (optional)
13.2.1 Acid/base neutralization curve
Plot the pH of each extract as a function of the equivalents of acid or base
added per dry gram of material to generate an acid/base neutralization curve.
NOTE: For materials in which both acid and base were used, equivalents of base can
be presented as the opposite sign of acid equivalents (i.e., 5 meq/g-dry of base
would correspond to -5 meq/g-dry of acid).
The titration curve can be interpreted as showing the amount of acid or base
that is needed to shift the pH of the subject material. This is helpful when evaluating
field scenarios where the pH of leachates is not buffered by the acidity or alkalinity of the
solid material.
13.2.2 LSP curve
An LSP curve can be generated for each COPC following chemical analyses of
all extracts by plotting the target analyte concentration in the liquid phase as a function
of the measured extract pH for each extract. As an example, Figure 6 illustrates the LSP
curves for arsenic and selenium from a coal combustion fly ash and indicates the limits
of quantitation (shown as ML and MDL) and the natural concentration response.
13.2.2.1 The lower limit of quantitation (LLOQ) of the
determinative method for each COPC may be shown as a horizontal line.
COPC concentrations below this line indicate negligible or non-quantitative
concentrations.
NOTE: The lower limit of quantitation is highly matrix dependent and should be
determined as part of a QA/QC plan.
1313-16 Revision 2
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13.2.2.2 Natural response is defined as the eluate pH and
COPC concentration measured when the solid material is extracted with
reagent water at an L/S of 10 mL/g-dry. The natural response values can be
shown on the LSP curve as a vertical line from the x-axis (at the replicate
average natural pH) intersected with a horizontal line (at the replicate average
COPC concentration). Alternatively, the natural response can be indicated in
results using a different symbol from other results.
13.2.2.3 The values on the curve indicate the eluate
concentration of the constituent of interest at an L/S of 10 mL/g-dry over a pH
range. The shape of the LSP curve is indicative of the speciation of the COPC
in the solid phase with four characteristic LSP curve shapes (i.e., relative
locations of maxima and minima) presented schematically in Figure 7.
Cationic Species (e.g., Cd) — The LSP curve of cationic species
typically has a maximum concentration in the acidic pH range that decreases to
lower values at alkaline pH.
Amphoteric Species (e.g., Pb, Cr(lll), Cu.) — The LSP curves tend
to be similar in shape to cationic LSP curves with greater concentrations in the
acidic pH range. However, the concentrations pass through a minimum in the
near neutral to slightly acid pH range only to increase again for alkaline pH
values. Typically, the increase at high pH is due to the solubility of hydroxide
complexes (e.g., [Pb(OH3)]").
Oxyanionic Species (e.g. [AsO4]~, [SeO4]", [MnO4]") — The LSP
curves often show maxima in the neutral to slightly alkaline range.
Highly Soluble Species (e.g., Na+, K+, CI") — The LSP curve is only
a weak function of pH.
The idealized LSP curves in Figure 7 can be compared with the
general shape of the test data to infer the speciation of the COPC in the solid
matrix. Concentration results from this method may be simulated with
geochemical speciation models to infer the mineral phases, adsorption
reactions, and soluble complexes that control the release of the COPC (see
Ref. 1).
14.0 METHOD PERFORMANCE
14.1 Performance data and related information are provided in SW-846 methods
only as examples and guidance. The data do not represent required performance criteria for
users of the methods. Instead, performance criteria should be developed on a project-specific
basis, and the laboratory should establish in-house QC performance criteria for the application
of this method. These performance data are not intended to be and must not be used as
absolute QC acceptance criteria for purposes of laboratory accreditation.
14.2 Refs. 2 and 3 may provide additional guidance and insight on the use,
performance and application of this method.
1313-17 Revision 2
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15.0 POLLUTION PREVENTION
15.1 Pollution prevention encompasses any technique that reduces or eliminates the
quantity and/or toxicity of waste at the point of generation. Numerous opportunities for pollution
prevention exist in laboratory operations. The EPA has established a preferred hierarchy of
environmental management techniques that places pollution prevention as the management
option of first choice. Whenever feasible, laboratory personnel should use pollution prevention
techniques to address their waste generation. When wastes cannot be feasibly reduced at the
source, the U.S. EPA recommends recycling as the next best option as long as the
management option if protective of human health and the environment.
15.2 For information about pollution prevention that may be applicable to
laboratories and research institutions consult Less is Better: Laboratory Chemical Management
for Waste Reduction available from the American Chemical Society's Department of
Government Relations and Science Policy, 1155 16th St., N.W. Washington, D.C. 20036,
http://www.acs.org.
16.0 WASTE MANAGEMENT
The Environmental Protection Agency requires that laboratory waste management
practices be conducted consistent with all applicable rules and regulations. The Agency urges
laboratories to protect the air, water, and land by minimizing and controlling all releases from
hoods and bench operations, complying with the letter and spirit of any sewer discharge permits
and regulations, and by complying with all solid and hazardous waste regulations, particularly
the hazardous waste identification rules and land disposal restrictions. For further information
on waste management, consult The Waste Management Manual for Laboratory Personnel
available from the American Chemical Society at the address listed in Sec. 14.2.
17.0 REFERENCES
1. H. A. van der Sloot, P.F.A.B. Seignette, J.C.L. Meeussen, O. Hjelmarand D.S. Kosson,
(2008), "A Database, Speciation Modeling and Decision Support Tool for Soil, Sludge,
Sediments, Wastes and Construction Products: LeachXS™-ORCHESTRA," in Venice
2008: Second International Symposium on Energy from Biomass and Waste, Venice,
Italy, 17-20 November 2008 (also see www.leaching.com).
2. D.S. Kosson, H.A. van der Sloot, F. Sanchez and A.C. Garrabrants, (2002), "An
Integrated Framework for Evaluating Leaching in Waste Management and Utilization of
Secondary Materials," Environmental Engineering Science, 19(3) 159-204.
3. D.S. Kosson, A.C. Garrabrants, H.A. van der Sloot (2009) "Background Information for
the Development of Leaching Test Draft Methods 1313 through Method 1316", (in
preparation).
1313-18 Revision 2
September 2010
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4. U.S. EPA(2006) Characterization of Mercury-Enriched Coal Combustion Residues from
Electric Utilities Using Enhanced Sorbents for Mercury Control, EPA-600/R-06/008,
February 2006.
5. U.S. EPA(2008) Characterization of Coal Combustion Residues from Electric Utilities
Using Wet Scrubbers for Multi-Pollutant Control, EPA-600/R-08/077, July 2008.
6. U.S. EPA(2009) Characterization of Coal Combustion Residues from Electric Utilities -
Leaching and Characterization Data, EPA-600/R-09/151, December 2009.
18.0 TABLES, DIAGRAMS, FLOWCHARTS, AND VALIDATION DATA
The following pages contain the tables and figures referenced by this method.
1313-19 Revision 2
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TABLE 1
EXTRACTION PARAMETERS AS FUNCTION OF MAXIMUM PARTICLE SIZE
Particle Size
(85 wt% less than)
(mm)
0.3
2.0
5.0
US Sieve
Size
50
10
4
Minimum Dry
Mass
(g-dry)
20 ±0.02
40 ± 0.02
80 ± 0.02
Contact Time
(h)
24 ±2
48 ±2
72 ±2
Suggested
Vessel Size
(mL)
250
500
1000
TABLE 2
MATERIAL NEUTRALIZATION CLASSIFICATIONS
Neutralization
Classification
Low Alkalinity
Material Types
soils; sediments; CCR fly ash; CCR bottom ash; coal milling rejects;
MSWI fly ash, MSWI bottom ash; sewage sludge amended soil
Moderate Alkalinity
High Alkalinity
soils; wood preserving waste; MSWI bottom ash; steel slag; electric
arc furnace dust; MSW compost; nickel sludge; Portland cement
mortar
Portland cement clinker; steel blast furnace slag, solidified waste
(fly ash, blast furnace slag, Portland cement)
NOTE: CCR = Coal combustion residue
MSWI = Municipal solid waste incinerator
1313-20
Revision 2
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TABLE 3
PRE-TEST TITRATION: ACID EQUIVALENT SCHEDULE
Neutralization
Classification
Low Alkalinity
Moderate Alkalinity
High Alkalinity
Equivalents of Acid (meq/g-dry)
Bottle 1
-2.0
-2.0
0
Bottle 2
-1.0
0
5.0
Bottle 3
0
2.0
10.0
Bottle 4
1.0
5.0
15.0
Bottle 5
2.0
10.0
25.0
NOTE: 1) Base additions shown as opposite sign of acid equivalents.
2) Additional pre-test point(s) interpolating or extrapolating from the pre-test schedule
may be necessary to provide adequate resolution in the titration curve.
TABLE 4
EXAMPLE SCHEDULE OF ACID AND BASE ADDITIONS
A
Test
position
T01
T02
T03
T04
T05
T06
T07
T08
T09
B01
B02
BOS
B
Target
extract
PH
13.0
12.0
10.5
9.0
8.0
Natural
5.5
4.0
2.0
QA/QC
QA/QC
QA/QC
C
Equivalents
of Acid
(meq/g-dry)
-1.10
-0.75
-0.38
-0.15
-0.05
0
0.12
0.90
3.10
0
3.10
-1.10
D
Volume of
2N HNO3
(mL)
-
-
-
-
-
-
1.20
9.00
31.0
-
31.0
-
E
Volume of
1N KOH
(mL)
22.0
15.0
7.60
3.0
1.0
-
-
-
-
-
-
22.0
F
Volume of
moisture in
sample
(mL)
2.22
2.22
2.22
2.22
2.22
2.22
2.22
2.22
2.22
-
-
-
G
Volume of
reagent water
(mL)
176
183
190
195
197
198
197
189
167
200
169
178
NOTE: 1) This schedule is based on "as tested" sample mass of 22.2±0.1 g (i.e., equivalent
"as tested" mass for a 20.0 g-dry sample at a solids content of 0.90 g-dry/g).
2) In this example, the natural pH is assumed to be 7.0±0.5.
3) Test positions marked B01, B02, and 603 are method blanks of reagent water,
reagent water + maximum acid addition, and reagent water + maximum base
addition, respectively.
Data modified from Ref. 2.
1313-21
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TABLE 5
FINAL EXTRACT PH TARGETS
pH Target
2.0±0.5
4.0±0.5
5.5±0.5
7.0±0.5
8.0±0.5
9.0±0.5
10.5±0.5
12.0±0.5
13.0±0.5
variable
Rationale
Provides estimates of total or available COPC content
Lower pH limit of typical management scenario
Typical lower range of industrial waste landfills
Neutral pH region; high release of oxyanions
Endpoint pH of carbonated alkaline materials
Minimum of LSP curve for some cationic and amphoteric COPCs
Minimum of LSP curve for some cationic and amphoteric COPCs
Maximum in alkaline range for LSP curves of amphoteric COPCs
Upper bound (field conditions) for amphoteric COPCs
Natural pH at L/S 10 ml/g-dry (no acid/base addition)
1313-22
Revision 2
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FIGURE 1
METHOD FLOWCHART
Ismaterial at
appropriate
particle size?
Particle Size Reduction
(Section 11.1)
Solids/Moisture Content
(Section 11.2)
Pre-Test Titration
(Section 11.3)
Acid/BaseAddition
Schedule (Section 11.4)
_v
Extraction Procedure
(Section 12.0)
Add/Base Addition
Leachate pH, EC, Eh
Documentation
and Graphing
1313-23
Revision 2
September 2010
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LJJ
FIGURE 2
EXAMPLE TITRATION CURVES FOR SELECTED "LOW ALKALINITY" WASTES
14
12 -
10 -
8 -
6 --
4 -
2 -
-3 -2
Q Wood Preserving Soil
• Harbor Sediment 2
A Coal Fly Ash
-1 0 1
Acid Added [meq/g-dry]
DSoil
DHarborSedimentS
A Coal Milling Rejects
DZincSoil
0 MSWI Bottom Ash
A Coal Bottom Ash
D Sewage Amended Soil
* MSWI Bottom Ash 2
A Coal Fly Ash
Some data taken LeachXS database (Ref. 1).
1313-24
Revision 1.1
April 2010
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UJ
FIGURES
EXAMPLE TITRATION CURVES FOR SELECTED "MODERATE ALKALINITY" WASTES
It
12 -
•in
ID
6 -
2 •
-
<
:
.
•
:
.
;> % J
0 a
r
0<|
or
7
L
>
I
o
p^
%
J °
• 0
1
I •
^D^
, , ,
o
Lx
o
v-
1
oo
- - -
• 0
0
I
1
4
00
1
A
•
0
-2
D Wood Preserving Soil
«MSW Com post
o Steel Slag
246
Acid Added [meq/g-dry]
DHarborSedimentS
O MSWI Bottom Ash 3
• Arc Furnace Dust (K061)
8
10
12
o MSW Sewage Sludge 2
O Dried Nickel Sludge
• Cement Mortar
Some data taken from LeachXS database (Ref. 1).
1313-25
Revision 1.1
April 2010
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-5
FIGURE 4
EXAMPLE TITRATION CURVES FOR SELECTED "HIGH ALKALINITY" WASTES
It •
12 -
10 •
IU
I
Q- fl -
o
1
LLJ g
n .
; i
n
n
: • A ! n D
i 0 i
i i
0
A A
i • i
i i
: i i
: i • i
i i
i • i
i i
1 • • A
1 ' •
1 1
1 1
1 1
1 1
1 1
n
A
A
D A
n
y
10
15
20
25
A Blast Furnace Slag 2
Acid Added [meq/g-dry]
n Portland Cement Clinker •Solidified Waste Simulant
Some data taken from LeachXS database (Ref. 1).
30
1313-26
Revision 1.1
April 2010
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FIGURES
EXAMPLE DATA REPORT FORMAT
ABC Laboratories
123 Main Street
Anytown, USA
Contact: John Smith
(555)111-1111
EPA METHOD 1313
Report of Analysis
Client Contact: Susan Jones
(555) 222-2222
Material Code: XYZ
Material Type: Coal Combustion Fly Ash
Test
Position
T01
Test
Position
T02
Date Received: 10/1/20xx
Test Date: 11/1/20xx
Report Date: 12/1/20xx
Replicate
A
Eluate Sample ID
Solid Material
Moisture Content
Water Added
Acid Added
Acid Strength
Base Added
Base Strength
Target pH
Eluate pH
Eluate Conductivity
Eluate ORP
Chemical Analysis
Al
As
Cl
Replicate
A
Eluate Sample ID
Solid Material
Moisture Content
Water Added
Acid Added
Acid Strength
Base Added
Base Strength
Target pH
Eluate pH
Eluate Conductivity
Eluate ORP
Chemical Analysis
Al
As
Cl
Value Units
XYZ-1313-T01-A
40.0 g
0.01 g
386.0 gH2o/g
14.0 ml
2.0 ml
N
1.0 ml
2.0 ±0.5
1.89
12.6 mS/c
203 mv
Value Units
216.0 mg/L
0.64 mg/L
<4.13 mg/L
Value Units
XYZ-1313-T02-A
40.0 g
0.01 g
400.0 gH2o/g
14.0 mL
2.0 mL
N
1.0 mL
4.0 ± 0.5
3.86
0.99 mS/c
180 mv
Value Units
449.0 mg/L
0.979 mg/L
<4.13 mg/L
Particle Size: 88% passing 2-mm sieve
Contact Time: 48 hours
Lab Temperature: 21 ± 2 °C
Acid Used: Nitric acid
Base Used: Sodium hydroxide
Method Note
EPA 9040
EPA 9050
QC Dilution
Flag Method Date Factor
EPA 6020 11/7/20xx 1000
EPA 6020 11/7/20xx 10
U EPA 9056 11/9/20xx 1
Method Note
EPA 9040 Natural pH
EPA 9050
QC Dilution
Flag Method Date Factor
EPA 6020 11/7/20xx 1000
EPA 6020 11/7/20xx 10
U EPA 9056 11/7/20xx 1
QC Flag Key: U Value below lower limit of quantitation as reported (< "LLOQ")
1313-27
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FIGURES
EXAMPLE LSP CURVES FROM A COAL COMBUSTION FLY ASH SHOWING ASSESSMENT
ZONES FOR A LANDFILL SCENARIO
IVAflJU
1000^
100
?MCLioj
g> 48
In 1 "
0.1
0 01
0001-
ML
MDL
BX
>.
_ . _ - ,
a
.,
•
i
i
•
O
95%
5%
4 « 8 |fo 12 14
PH :
D SR2-BPT-000 1 -A
o SR2-BPT-0001 - B
A SR2-BPT-0001 - C
ivvw -
1497
1000 -
100 -
7 10-
|
5 o,.
001 -
Onni
.
..§•
4 '
tffi ^^
D •
^m m ^^m * ^^^ • ^H
i i W
pH
m
.
— - MDL
•
OSR2-SHT-0001 -A
« SR2-SHT-0001 - B
ASR2-SHT-0001 -C
Figure taken from Ref. 4.
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FIGURE?
SCHEMATIC LSP CURVES OF CATIONIC, AMPHOTERIC,
AND OXYANIONIC SPECIES
1
0)
o
o
1
Highly Soluble I
2 4 6 8 10 12 14
Leach ate pH
Figure taken from Ref. 2.
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APPENDIX B
METHOD 1314-
ULIQUID-SOLID PARTITIONING AS A FUNCTION OF
LIQUID-SOLID RATIO FOR CONSTITUENTS IN SOLID MATERIALS
USING AN UP-FLOW PERCOLATION COLUMN PROCEDURE
-------
PRELIMINARY VERSION1 OF METHOD 1314
LIQUID-SOLID PARTITIONING AS A FUNCTION OF LIQUID-SOLID RATIO FOR
CONSTITUENTS IN SOLID MATERIALS USING AN UP-FLOW PERCOLATION COLUMN
PROCEDURE
SW-846 is not intended to be an analytical training manual. Therefore, method
procedures are written based on the assumption that they will be performed by analysts who are
formally trained in at least the basic principles of chemical analysis and in the use of the subject
technology.
In addition, SW-846 methods, with the exception of required method use for the analysis
of method-defined parameters, are intended to be guidance methods which contain general
information on how to perform an analytical procedure or technique which a laboratory can use
as a basic starting point for generating its own detailed Standard Operating Procedure (SOP),
either for its own general use or for a specific project application. The performance data
included in this method are for guidance purposes only, and are not intended to be and must not
be used as absolute QC acceptance criteria for purposes of laboratory accreditation.
1.0 SCOPE AND APPLICATION
1.1 This method is designed to provide the liquid-solid partitioning (LSP) of
inorganic constituents (e.g., metals, radionuclides) and non-volatile organic constituents (e.g.,
polycyclic aromatic hydrocarbons (PAHs), dissolved organic carbon) in a granular solid material
as a function of liquid-to-solid (LS) ratio under percolation conditions. The first eluates of the
column test provide insight into pore solution composition either in a granular bed (e.g., soil
column) or in the pore space of low-permeability material (e.g., solidified monolithic or
compacted granular fill). Analyses of eluates for dissolved organic carbon and of the solid
phase for total organic carbon afford evaluation of the impact of organic carbon release and the
influence of dissolved organic carbon on the LSP of inorganic constituents.
1.2 This method is intended to be used as part of environmental leaching
assessment for the evaluation of disposal, beneficial use, treatment effectiveness and site
remediation.
1.3 This method is suitable to a wide range of granular solid materials. Example
materials include industrial wastes, soils, sludges, combustion residues, sediments, construction
materials, and mining wastes. This method is not suitable to monolithic materials (e.g., cement-
based and stabilized materials) without particle-size reduction prior to testing.
1.4 This test method is intended as a means for obtaining a series of extracts (i.e.,
the eluates) of a granular solid material which may be used to show eluate concentrations
1 Preliminary Version denotes that this method has not been endorsed by EPA but is under consideration
for inclusion into SW-846. This method has been derived from published procedures (Kosson et al,
2002). The method has been submitted to the U.S. EPAOffice of Resource Conservation and Recovery
and is currently under review for development of interlaboratory validation studies to develop precision
and bias information.
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and/or cumulative release as a function of LS ratio which can be related to a time scale when
data on mean infiltration rate, density and height of application are available.
1.5 This method provides options for the preparation of analytical samples that
provide flexibility based on the level of detail required. For example, when the purpose of
characterization is for comparison to previous testing, compositing of eluates may be possible to
create a reduced set of analytical samples. Table 1 outlines the eluate fractions and collection
options, based on whether concentration or cumulative release is to be reported. The collection
schemes are described below.
1.5.1 Complete characterization
For complete characterization of eluate concentration and cumulative release
as a function of LS ratio, nine discrete eluate collections and analyses are required (see
Table 1, Option A). No compositing of eluate fractions is performed for complete
characterization, and all eluate fractions are analyzed.
Eluate concentrations from complete characterization may be used in
conjunction with information regarding environmental management scenarios to
estimate anticipated leaching concentrations, release rates, and extents of release for
individual material constituents in the management scenarios evaluated. Eluate
concentrations may also be used along with geochemical speciation modeling to infer
the mineral phases that control the LSP in the pore structure of the solid material.
1.5.2 Limited analysis
Under a limited analysis approach, nine eluate collections and analysis of six
analytical samples are required. If evaluation is based on eluate concentrations, six
discrete eluate fractions are chemically analyzed (see
Table 1, Option B). If evaluation is based on cumulative release, some eluate fractions
are composited by volume-weighted averaging to create a set of six analytical samples
(see Table 1, Option C). The concentrations of composite analytical samples cannot be
interpreted along with eluate fractions on the basis of concentration.
1.5.3 Index testing
For the determination of consistency between the subject material and
previously characterized materials, nine eluate collections and analysis of three
analytical samples are required. If consistency is to be determined by eluate
concentrations, three discrete eluate fractions are chemically analyzed (see Table 1,
Option D). If consistency is to be determined by cumulative release, some eluate
fractions are composited by volume-weighted averaging to create a set of three
analytical samples (see Table 1, Option E). The concentrations of composited
analytical samples cannot be interpreted along with eluate fractions on the basis of
concentration.
1.6 This method is not applicable to characterize the release of volatile organic
analytes.
1.7 This method provides eluate solutions considered indicative of leachate under
field conditions only where the field leaching pH is controlled by the alkalinity or acidity of the
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solid material and the field leachate is not subject to dilution or other attenuation mechanisms.
The cumulative mass of constituent released over a LS ratio range may be considered an
estimate of the maximum mass of that constituent to be leached under field leaching over
intermediate time frames (e.g., up to 100 years) and the domain of laboratory test pH.
1.8 Prior to employing this method, analysts are advised to take reasonable
measures to ensure that the granular sample is homogenized to the extent practical. Particle-
size reduction may provide additional assurance of sample homogenization.
1.9 In preparation of solid materials for use in this method, particle-size reduction or
exclusion of samples with large grain size is used to enhance the approach towards liquid-solid
equilibrium over the residence time of eluant in the column.
1.10 The structure and use of this method is similar to that of MEN 7343 (see Ref. 1)
and CEN TS 14405 (see Ref. 2).
1.11 Prior to employing this method, analysts are advised to consult the base
method for each type of procedure that may be employed in the overall analysis (e.g., Methods
9040, 9045, and 9050, and the determinative methods for the target analytes), quality control
(QC) acceptance criteria, calculations, and general guidance. Analysts also should consult the
disclaimer statement at the front of the manual and the information in Chapter Two for guidance
on the intended flexibility in the choice of methods, apparatus, materials, reagents, and
supplies, and on the responsibilities of the analyst for demonstrating that the techniques
employed are appropriate for the analytes of interest, in the matrix of interest, and at the
concentration levels of concern.
In addition, analysts and data users are advised that, except where explicitly specified in
a regulation, the use of SW-846 methods is not mandatory in response to Federal testing
requirements. The information contained in this method is provided by EPA as guidance to be
used by the analyst and the regulated community in making judgments necessary to generate
results that meet the data quality objectives for the intended application. Guidance on defining
data quality objectives can be obtained at .http://www.epa.qov/QUALITY/qs-docs/q4-final.pdf
1.12 Use of this method is restricted to use by, or under supervision of, properly
experienced and trained personnel. Each analyst must demonstrate the ability to generate
acceptable results with this method.
2.0 SUMMARY OF METHOD
Eluant is introduced into a column of moderately-packed granular material in an up-flow
pumping mode, with eluate collection performed as a function of the cumulative LS ratio. Up-
flow pumping is used to minimize air entrainment and flow channeling. The default eluant for
most materials is reagent water. However, a solution of 1.0 mM calcium chloride in reagent
water is used when testing materials with either a high clay content (i.e., to prevent
deflocculation of clay layers) or high organic matter (i.e., to moderate mobilization of dissolved
organic carbon). The flow rate is maintained between 0.5-1.0 LS/day to increase the likelihood
of local equilibrium between the solid and liquid phases, due to residence times longer than 1
day. Eluate volumes are chemically analyzed for a combination of inorganic and non-volatile
organic analytes depending on the constituents of potential concern (COPC). For the purposes
of chemical speciation modeling, the entire eluant volume up to 10 mL/g dry sample (g-dry) is
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collected in nine specific aliquots of varying volume. A limited subset of eluants volumes within
the same LS ratio range may be collected and analyzed for regulatory and compliance
purposes. A flowchart for performing this method is shown in Figure 1.
3.0 DEFINITIONS
3.1 COPC — A chemical species of interest, which may or may not be regulated,
but may be characteristic of release-controlling properties of the sample geochemistry.
3.2 Release — The dissolution or partitioning of a COPC from the solid phase to
the aqueous phase during laboratory testing (or under field conditions). In this method, mass
release is expressed in units of mg COPC/kg dry solid material.
3.3 LSP — The distribution of COPCs between the solid and liquid phases at the
conclusion of the extraction.
3.4 LS ratio — the fraction of the total liquid volume (including the moisture
contained in the "as used" solid sample) to the dry mass equivalent of the solid material. LS
ratio is typically expressed in volume units of liquid per dry mass of solid material (mL/g-dry).
3.5 "As-tested" sample — The solid sample at the conditions (e.g., moisture content
and particle-size distribution) present at the time of the start of the test procedure. The "as-
tested" conditions will differ from the "as-received" sample conditions if particle-size reduction
and drying were necessarily performed.
3.6 Dry-mass equivalent — The mass of "as-tested" (i.e., "wet") sample that
equates to the mass of dry solids plus associated moisture, based on the moisture content of
the "as-tested" material. The dry-mass equivalent is typically expressed in mass units of the
"as-tested" sample (g).
3.7 Refer to the SW-846 chapter of terms and acronyms for potentially applicable
definitions.
4.0 INTERFERENCES
4.1 Solvents, reagents, glassware, and other sample processing hardware may
yield artifacts and/or interferences to sample analysis. All of these materials must be
demonstrated to be free from interferences under the conditions of the analysis by analyzing
method blanks. Specific selection of reagents and purification of solvents by distillation in all-
glass systems may be necessary. Refer to each method to be used for specific guidance on
quality control procedures and to Chapters Three and Four for general guidance on the cleaning
of laboratory apparatus prior to use.
4.2 When the test method is applied to solid materials with a clay content greater
than 10% or an organic matter content greater than 1%, a solution of 1.0 mM calcium chloride in
reagent water is recommended to minimize deflocculation of clay minerals. However, the use of
calcium chloride solution will interfere with the determination of actual calcium and chloride
release.
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NOTE: The critical values of clay and organic matter content are verified during ruggedness
testing.
4.3 When this method is applied to fine-grained, granular materials, tamping during
column preparation may result in flow problems due to a low-permeability sample bed. This
problem can be resolved by incorporating 20-50% inert material (e.g., 20-30-mesh normal sand
or2-mm borosilicate glass beads) into the solid sample. Alternatively, mass release from low-
permeability materials may be measured using Method 1315.
5.0 SAFETY
5.1 This method does not address all safety issues associated with its use. The
laboratory is responsible for maintaining a safe work environment and a current awareness file
of OSHA regulations regarding the safe handling of the chemicals listed in this method. A
reference file of material safety data sheets (MSDSs) should be available to all personnel
involved in these analyses.
6.0 EQUIPMENT AND SUPPLIES
The mention of trade names or commercial products in this manual is for illustrative
purposes only, and does not constitute an EPA endorsement or exclusive recommendation for
use. The products and instrument settings cited in SW-846 methods represent those products
and settings used during the method development or subsequently evaluated by the Agency.
Glassware, reagents, supplies, equipment, and setting other than those listed in this manual
may be employed provided that method performance appropriate for the intended application
has been demonstrated and documented.
This section does not list common laboratory glassware (e.g., beakers and flasks).
6.1 Column apparatus
This method recommends the use of a specific column apparatus (see Figure 2).
Equipment with equivalent specifications may be substituted. The apparatus should have
valves and quick connectors (e.g., Luer lock fittings) such that the column with end caps can be
removed for packing with test material and mass measurements.
6.1.2 A 30-cm, straight cylindrical column with an inner diameter (ID) of 5-
cm and constructed of inert material, resistant to high- and low-pH conditions and
interaction with constituents of interest.
6.1.2.1 For the evaluation of inorganic COPC mobility,
equipment composed of borosilicate glass (e.g., Kimble-Kontes CHROMAFLEX
#420830-3020 or equivalent), polytetra-fluoroethylene (PTFE), high density
polyethylene (HOPE), polypropylene (PP), or polyvinyl chloride (PVC) is
recommended.
6.1.2.2 For the evaluation of non-volatile organic and mixed
organic/inorganic COPCs, equipment composed of glass or Type 316 stainless
steel is recommended. PTFE is not recommended for
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non-volatile organics, due sorption of species with high hydrophobicity (e.g.,
PAHs). Borosilicate glass is recommended over other types of glass, especially
when inorganic analytes are of concern.
6.1.3 The column must be of sufficient volume to accommodate a
minimum of a 300-g-dry material plus a 1-cm layer of silica sand (20-30 mesh) used at
the bottom of the column to distribute eluant flow and at the top of the column to form a
coarse filter for eluate particulates.
6.1.4 The column must have end cap materials that form a leak-proof seal
and that can withstand pressures, such as encountered when pumping eluant through
the column.
6.2 Eluant feed stock container — Resealable bottle or other container, constructed
of inert material, capable of withstanding extreme pH conditions and interaction with any
constituents of interest (see guidance in Sec. 6.1.2.).
6.3 Eluant feed tubing — 2-mm or similarly small ID tubing composed of
chemically-inert material such as polyvinyl chloride or equivalent.
NOTE: Larger ID tubing may be required if a single eluent stock container is used to feed
multiple column set-ups.
6.4 Eluate collection bottles — capable of assembly with column apparatus using
simple water locks in order to prevent the intrusion of air (see Figure 2).
6.5 20-30-mesh normal washed quartz sand
6.6 Balance — Capable of 0.01-g resolution for masses less than 500 g.
6.7 Filtration apparatus — Pressure or vacuum filtration apparatus composed of
appropriate materials so as to maximize the collection of extracts and minimize loss of the
COPCs (e.g., Nalgene #300-4000 or equivalent) (see Sec. 6.1).
6.8 Filtration membranes — Composed of PP or equivalent material with an
effective pore size of 0.45-um (e.g., Gelman Sciences GH Polypro #66548 from Fisher Scientific
or equivalent).
6.9 pH Meter — Laboratory model with the capability for temperature compensation
(e.g., Accumet 20, Fisher Scientific or equivalent) and a minimum resolution of 0.1 pH units.
6.10 pH combination electrode — Composed of chemically-resistant materials.
6.11 Conductivity meter— Laboratory model (e.g., Accumet 20, Fisher Scientific or
equivalent), with a minimum resolution of 5% of the measured value.
6.12 Conductivity electrodes — Composed of chemically-resistant materials.
7.0 REAGENTS AND STANDARDS
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7.1 Reagent-grade chemical must be used in all tests. Unless otherwise indicated,
it is intended that all reagents conform to the specifications of the Committee on Analytical
Reagents of the American Chemical Society, where such specification are available. Other
grade may be used, provided it is first ascertained that the reagent is of sufficiently high purity to
permit its use without lessening the accuracy of the determination. Inorganic reagents and
extracts should be stored in plastic to prevent interaction of constituents from glass containers.
7.2 Reagent water must be interference free. All references to water in this method
refer to reagent water unless otherwise specified.
7.3 Calcium chloride (1.0 mM), CaCI2 — Prepared by dissolving 0.11 g of ACS
grade or better solid calcium chloride in 1 L of reagent water.
8.0 SAMPLE COLLECTION, PRESERVATION, AND STORAGE
8.1 See the introductory material to Chapter Three "Inorganic Analytes" and
Chapter Four "Organic Analytes."
8.2 All samples should be collected using an appropriate sampling plan.
8.3 All analytical sample containers should be composed of materials that minimize
interaction with solution COPCs. For further information, see Chapters Three and Four.
8.4 Preservatives should not be added to samples before extraction.
8.5 Samples can be refrigerated, unless refrigeration results in an irreversible
physical change to the sample.
8.6 Extracts should be preserved according to the guidance given in the individual
determinative methods for the COPCs.
8.7 Extract holding times should be consistent with the aqueous sample holding
times specified in the determinative methods for the COPCs.
9.0 QUALITY CONTROL
9.1 Refer to Chapter One for guidance on quality assurance (QA) and QC
protocols. When inconsistencies exist between QC guidelines, method-specific QC criteria take
precedence over both technique-specific criteria and those criteria given in Chapter One, and
technique-specific QC criteria take precedence over the criteria in Chapter One. Any effort
involving the collection of analytical data should include development of a structured and
systematic planning document, such as a Quality Assurance Project Plan (QAPP) or a Sampling
and Analysis Plan (SAP), which translates project objectives and specifications into directions
for those that will implement the project and assess the results. Each laboratory should
maintain a formal quality assurance program. The laboratory should also maintain records to
document the quality of the data generated. All data sheets and quality control data should be
maintained for reference or inspection.
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9.2 In order to demonstrate the purity of reagents, at least one eluant blank should
be tested. If multiple batches of eluant are employed, one eluant blank from each batch should
be analyzed.
9.3 The analysis of extracts should follow appropriate QC procedures, as specified
in the determinative methods for the COPCs. Refer to Chapter One for specific quality control
procedures.
9.4 Unless the "as-received" samples are part of a time-dependent (e.g., aging)
study, solid materials should be processed and tested within one month of their receipt.
10.0 CALIBRATION AND STANDARDIZATION
10.1 The balance should be calibrated and certified at a minimum annually or in
accordance with laboratory policy.
10.2 Prior to measurement of eluate pH, the pH meter should be calibrated using a
minimum of two standards that bracket the range of pH measurements. Refer to Methods 9040
and 9045 for additional guidance.
10.3 Prior to measurement of eluate conductivity, the meter should be calibrated
using at least one standard at a value greater than the range of conductivity measurements.
Refer to Method 9050 for additional guidance.
11.0 PREPARATORY PROCEDURES
11.1 Particle-size reduction (if required)
11.1.1 In this method, particle-size reduction is used to prepare large-
grained samples for the column test so that the approach toward liquid-solid equilibrium
is enhanced and fluid channeling along column walls is minimized. The maximum
particle size of the solid should < 1/20 of the column diameter. For the column
recommended in this method, a maximum particle size of 2.5 mm is acceptable.
Therefore, 85% of the test material should pass through a 2.38-mm (U.S. No. 8) sieve.
If less than 15% of the solid material is larger than the maximum acceptable particle
size, this fraction of the solid may be excluded from the material tested, rather than
particle size-reduced. The mass and nature of the discarded fraction should be
documented.
11.1.2 Particle-size reduction of "as received" sample may be achieved
through crushing, milling or grinding with equipment made from chemically-inert
materials. During the reduction process, care should be taken to minimize the loss of
sample and potentially volatile constituents in the sample.
11.1.3 If the moisture content of the "as received" material is greater than
15% (wet basis), air drying or desiccation may be necessary. Oven drying is not
recommended for the preparation of test samples due to the potential for mineral
alteration and volatility loss. In all cases, the moisture content of the "as received"
material should be recorded.
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NOTE: If the solid material is susceptible to interaction with the atmosphere (e.g.,
carbonation, oxidation), drying should be conducted in an inert environment.
11.1.4 When the material seems to be of a somewhat uniform particle size,
calculate the percentage less than the sieve size as follows:
% Passing = Msieved x 100%
Mtotal
Where: Msieved = mass of sample passing the sieve (g)
Mtotai = mass of total sample (g) (e.g., Msieved + mass not passing sieve)
11.1.5 The fraction retained by the sieve should be recycled for further
particle-size reduction until at least 85% of the initial mass has been reduced below the
designated maximum particle size. Calculate and record the final percentage passing
the sieve and the designated maximum particle size. For the uncrushable fraction of the
"as received" material, record the fraction mass and nature (e.g., rock, metal or glass
shards, etc).
11.1.6 Store the size-reduced material in an airtight container in order to
prevent contamination via gas exchange with the atmosphere. Store the container in a
cool, dark and dry place prior to use.
11.2 Determination of solids and moisture content
11.2.1 In order to calculate eluate collection as a function of the dry-mass
equivalent of "as tested" sample material, the solids content of the solid sample material
should be determined and recorded. In this method, the moisture content is determined
and recorded on the basis of the "wet" or "as-tested" sample.
WARNING: The drying oven should be contained in a hood or otherwise properly
ventilated. Significant laboratory contamination or inhalation hazards may
result when drying heavily contaminated samples. Consult the laboratory
safety officer for proper handling procedures prior to drying samples that
may contain volatile, hazardous, flammable or explosive materials.
11.2.2 Place a 5-10-g sample of solid material into a clean, pre-tared dish
or crucible. Dry the sample to a constant mass at 105 ± 2 °C. Periodically check the
sample mass after allowing the sample to cool to room temperature (20 ± 2 °C) in a
desiccator.
NOTE: The oven-dried sample is not used for the extraction and should be properly
disposed of once the dry mass is determined.
11.2.3 Calculate and report the solids content as follows:
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sc = dry
Mtest
Where: SC = solids content (g-dry/g)
Mdry = mass of oven-dried sample (g-dry)
Mtest = mass of "as-tested" sample (g)
11.2.4 Calculate and report the moisture content (wet basis) as follows:
M -
_ test
wet -
Mtest
Where: MC(wet) = moisture content on a wet basis (gH2o/g)
Mdry = mass of oven-dried sample (g-dry)
Mtest = mass of "as-tested" sample (g)
11.3 Column preparation
11.3.1 Prepare the column test apparatus as depicted in Figure 2. Eluant
feed should be directed through the lower end cap and upwards into the column, in order
to minimize air retention in the packed bed and fluid channeling along the column walls.
NOTE: When solid samples may be affected by dissolved oxygen in the feed stock, an
inert gas (e.g., nitrogen or argon) may be bubbled through the feed solution to
displace oxygen or used to purge the headspace above the feed solution.
NOTE: When alkaline or other air-sensitive eluates are expected, the vapor space of
empty collections bottles may be purged with an inert gas
(e.g., nitrogen or argon) prior to eluate collection.
11.3.2 Record the mass of the empty column with end caps and any tubing
leads that are needed to separate the column from the entire apparatus.
11.3.3 Place an approximately 1 -cm thick layer of quartz sand (Sec. 6.5)
on the bottom of the column using a small scoop or spoon. Record the mass of the
column and sand layer. Level the sand layer by tapping the sides of the column.
11.3.4 Pack the main body of the column with a minimum 300-g dry-mass
equivalent of "as tested" sample in approximately five layers with light tamping with a
glass rod to level the material between layers. The top of the packed sample should be
approximately 1 cm from the level of the column interface with the top end cap. Record
the mass of the column, lower sand layer, and "as tested" sample.
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11.3.5 Place a layer of sand to fill the approximate 1-cm gap between the
top of the sample packing and the interface between the column and top-end cap.
Record the total mass of the completely-packed column.
11.3.6 Determine the "as tested" mass of the sample packing by
subtracting the mass of the column and lower sand layer (Sec. 11.3.3) from the mass of
the column, sand layer and packing (Sec. 11.3.4).
11.3.7 Calculate the dry-mass equivalent packed of "as tested" sample into
the column using the solids content as follows:
Mdry = SC - Mtest
Where: Mdry = dry-mass equivalent of sample in column (g-dry)
SC = solids content (g-dry/g)
Mtest = mass of "as tested" sample in column (g)
11.4 Pump setup
11.4.1 Prior to the start of the test, set the flow rate of the pump to a value
that will provide an eluate production rate of 0.75 ± 0.25 LS/day. For example, given a
dry-mass equivalent of 350 g-dry, an LS ratio of 0.5 would translate to 175 mL/g-dry, in
which case the pump should be set to a flow rate of 175 mL/day.
11.4.2 Prime the tubing with eluant
11.4.2.1 Detach the inlet tubing from the bottom of the column
and place the open end into a waste container.
11.4.2.2 Turn on the pump and allow the inlet tubing to fill with
eluent. Remove any air bubbles trapped in the inlet tubing.
11.4.2.3 When the inlet tubing is full with eluant, stop the pump
and reconnect the tubing to the bottom of the column.
11.5 Eluant collection schedule
11.5.1 Table 2 provides a schedule of fraction end-point LS ratios, interval
LS ratios, and eluate fraction volumes for collection, assuming a
dry-mass equivalent of 300 g-dry. The minimum volume of each collection bottle should
be sized so as to capture the entire eluate fraction.
11.5.2 Using the assumed pump rate and the dry-mass equivalent of the
sample, calculate the durations of column testing required to reach the target eluate
collection LS ratios shown in Table 2 as follows:
1314-11 Revision 1
December 2009
-------
Where: Tj = target time from start for collection of eluant fraction i (day)
Mdry = dry-mass equivalent of sample in column (g-dry)
j = target cumulative LS ratio for interval i from Table 1 (mL/g-dry)
j = pump rate assumed for interval i (ml/day)
Alternatively, use the provided Microsoft® Excel spreadsheet template to
develop the schedule of target collection times.
NOTE: The schedule of predicted collection times is for reference purposes only.
Typically, the eluate collection rate is slower that predicted initially, due in part to
pump inefficiencies, back pressure and dead-volume lag times. The decision to
switch collection bottles should be made based on the volume of eluate
collected with time. The schedule may be revised with each eluate fraction
collected, so that the prediction of future collections may be more accurate.
Pump flow-rate adjustment may be necessary.
12.0 COLUMN TEST PROCEDURE
12.1 Column/eluant equilibration
12.1.1 Turn on the pump and allow the column to fill with eluant, thus
wetting the column packing.
12.1.2 When the column packing is completely wetted and the eluant level
is even with the top of the column (or just beginning to be seen through the effluent
tubing at the top of the column apparatus), stop the pump and allow the column to
equilibrate for 24 hours.
12.2 Column test
12.2.1 Following equilibration, begin the column test by starting the pump
and recording the date and time.
NOTE: The eluate production rate should be monitored frequently during the column
test and the pump rate adjusted, such that the eluate production rate is
maintained at approximately 0.75 ± 0.25 LS/day.
12.2.2 When the eluate fraction has reached the target volume according
to the predicted collection schedule, release the Luer lock connecting the active
collection bottle and attach the eluant tubing to a new collection bottle.
12.3. Eluate processing
12.3.1 Decant a minimum volume (~ 5 ml_) of the eluate fraction from the
collection vessel in order to measure the solution characteristics.
1314- 12 Revision 1
December 2009
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12.3.2 Measure and record the pH, specific conductivity, and oxidation-
reduction potential (ORP) (optional, but strongly recommended) of the eluate (see
Methods 9040, 9045, and 9050).
12.3.3 Separate any suspended particulates from the remaining liquid in
the collection bottle by pressure or vacuum filtration through a 0.45-um filtration
membrane (Sec.6.8).
NOTE: If either low-volatility organic species or mercury is a COPC, pressure filtration is
recommended over vacuum filtration in order to minimize volatility losses.
12.3.4 Immediately, preserve and store the volume(s) of eluate required for
chemical analysis. Preserve all analytical samples in a manner that is consistent with
the determinative chemical analyses to be performed.
12.4 Reiterate Sees. 12.2.2-12.3.4 until nine eluate fractions are collected up to an
LS ratio of 10 ± 0.2 mL/g-dry.
NOTE: In order to complete this method, all nine eluate fractions must be collected from
the column. However, for purposes of limited analysis or index testing with
interpretation based on cumulative release, fractions may be composited by
volume-weighted averaging to create a single analytical sample from multiple
eluate fractions.
12.5. Analytical sample preparation options
This method allows for options in the preparation of analytical samples based on the
detail of characterization required (e.g., complete, limited or index) and the basis for data
reporting (e.g., concentration or cumulative release). However, the complete set of nine eluate
fractions must be collected in all cases.
12.5.1 Table 1 shows the analytical preparation scheme for Options A-E
described in the following sections. Each composite sample may be created either by
combining the total eluate volumes and preserving the total sample for analysis; or
combining aliquots of two eluate fractions using volume-weighted averages. However, it
is recommended that composite analytical samples be prepared using aliquots of eluate
fractions whenever possible, rather than whole eluate fractions as this approach allows
for potential analysis of discrete eluate fractions if desired at a later date.
12.5.1.1 Option A — This sample preparation option is used for complete
characterization and includes analysis of all eluate fractions. Since the entire cumulative
release curve is captured in nine discrete fractions, reported data may be based on
either eluate concentrations or cumulative release.
12.5.1.2 Option B — This sample preparation option is used only for limited
analyses based on eluate concentration. Six discrete eluate fractions are analyzed.
Data obtained using this option cannot be used for cumulative release since there
are sections of the cumulative release curve not analyzed.
1314-13 Revision 1
December 2009
-------
12.5.1.3 Option C — This sample preparation option is used only for limited
analysis based on cumulative release. Six analytical samples are created from
three discrete eluate fractions and three composite samples. In the scheme shown
in Table 1, the following fractions are composited:
• T04andT05
• T06 and T07
• T08 and T09
12.5.1.4 Option D — This sample preparation option is used only for index
testing based on eluate concentration. Three discrete eluate fractions are analyzed.
Data obtained using this option cannot be used for cumulative release since there are
sections of the cumulative release curve not analyzed.
12.5.1.5 Option E — This sample preparation option is used only for index
testing based on cumulative release. Three analytical samples are created from
one discrete eluate fraction and two composite samples. In the scheme shown in
Table 1, the following fractions are composited:
• T02, T03, T04, and T05
• T06, T07, T08, and T09
12.5.2 Volume-weighted composites
12.5.2.1 The volume of aliquots of eluate fractions for composite analytical
samples may be calculated using the Excel template provided or the following
formula:
Where: Vj = the volume of an aliquot from eluate fraction i (ml)
Fj = the collected volume of eluate fraction i (ml)
Vsampie = the total volume of the analytical sample (ml)
n = total number of eluate fractions to be composited
As an illustration of volume-weighted averaging, eluate fraction aliquots are
calculated as required to create an analytical sample by compositing eluate fractions
T06 through T09 for index testing based on cumulative release. The calculation
follows the example volumes shown in Table 2 and assumes that an analytical
sample volume of 100 ml_ is required.
TOS + FTos = 45° mL +150 ml_ +1350 ml_ +150 ml_ = 2100 ml
1314- 14 Revision 1
December 2009
-------
•^ i
i
x VsamDle = 450mL x 1 00 ml_ = 21 .5 mL
sample 2100 mL
VT07 = ^L x VsamDle = 150mL x 100 mL = 7.1 mL
T07 „ sample 2100 mL
. . FTIIII i, 1 35O mL - — — i ~» m ** i
VTOB = -F- x Vsampie = 210Q ml x 100 mL = 64.3 mL
i
-------
e) Measured eluate conductivity (mS/cm)
f) Measured ORP (mV) (optional)
g) Concentration of all COPCs
h) Analytical QC qualifiers as appropriate
13.2 Data Interpretation (optional)
13.2.1 Concentration as a function of LS ratio
13.2.1.1 A curve of the eluate concentration as a function of LS ratio can be
generated for each COPC after chemical analysis of all extracts by plotting the
constituent concentration in the liquid phase as a function of the cumulative collected LS
ratio. The curve indicates the nominal equilibrium concentration of the constituent of
interest as a function of LS ratio from 0 to 10 mL/g-dry at natural pH. An example such
curve is provided in Figure 4.
13.2.1.2 The lower limit of quantitation (LLOQ) of the determinative method
for each COPC may be shown as a horizontal line. COPC concentrations below this line
indicate negligible or non-quantitative concentrations.
NOTE: The lower limit of quantitation is highly matrix dependent and should be
determined as part of a QA/QC plan.
13.3 Cumulative release as a function of LS ratio
13.4.1 The cumulative mass release of a COPC per unit solid material may
be calculated as follows:
- ZLSi_i)]
Where: ZMj = the cumulative mass release through interval i (mg/kg-dry])
d = the concentration of the COPC in the eluant collected during
interval i (mg/L)
ILSj = the cumulative LS ratio of eluate collected through
interval i (L/kg-dry)
ILSj-1 = the cumulative LS ratio of eluate collected through
interval i-1 (L/kg-dry)
13.4.2 Prepare a curve of the cumulative mass release generated for each
COPC by plotting the cumulative mass release calculated in Sec. 13.4.1 as a function of
the cumulative collected LS ratio. This curve provides an interpretation of the cumulative
mass expected to be leached from a column of material as a function of LS ratio
percolating through the column.
13.4.3 A comparison of the slope of the mass release curve to a unity
slope, which is indicative of solubility-controlled release, may be made by plotting the
cumulative mass release calculated in Sec. 13.4.1 versus the logarithm of the
cumulative collected LS ratio. An example is provided in Figure 5.
1314- 16 Revision 1
December 2009
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14.0 METHOD PERFORMANCE
14.1 Performance data and related information are provided in SW-846 methods
only as examples and guidance. The data do not represent required performance criteria for
users of the methods. Instead, performance criteria should be developed on a project-specific
basis, and the laboratory should establish in-house QC performance criteria for the application
of this method. These performance data are not intended to be and must not be used as
absolute QC acceptance criteria for purposes of laboratory accreditation.
14.2 Refs. 3 and 4 may provide additional guidance and insight on the use,
performance and application of this method.
15.0 POLLUTION PREVENTION
15.1 Pollution prevention encompasses any technique that reduces or eliminates the
quantity and/or toxicity of waste at the point of generation. Numerous opportunities for pollution
prevention exist in laboratory operations. The EPA has established a preferred hierarchy of
environmental management techniques that places pollution prevention as the management
option of first choice. Whenever feasible, laboratory personnel should use pollution prevention
techniques to address their waste generation. When wastes cannot be feasibly reduced at the
source, the Agency recommends recycling as the next best option.
15.2 For information about pollution prevention that may be applicable to
laboratories and research institutions consult Less is Better: Laboratory Chemical Management
for Waste Reduction available from the American Chemical Society's Department of
Government Relations and Science Policy, 1155 16th St., N.W. Washington, D.C. 20036,
http://www.acs.org.
16.0 WASTE MANAGEMENT
The Environmental Protection Agency requires that laboratory waste management
practices be conducted consistent with all applicable rules and regulations. The Agency urges
laboratories to protect the air, water, and land by minimizing and controlling all releases from
hoods and bench operations, complying with the letter and spirit of any sewer discharge permits
and regulations, and by complying with all solid and hazardous waste regulations, particularly
the hazardous 1314 - 18 Rev 0 January 2009 Pre-release DRAFT for comment waste
identification rules and land disposal restrictions. For further information on waste
management, consult The Waste Management Manual for Laboratory Personnel available from
the American Chemical Society at the address listed in Sec. 15.2.
17.0 REFERENCES
1. NEN 7343, (1995), "Leaching Characteristics of Solid Earth and Stony
Materials - Leaching Tests - Determination of the leaching of Inorganic Constituents
from Powdery and Granular Materials with the Percolation Test," Dutch Standardization
Institute, Delft, The Netherlands.
1314-17 Revision 1
December 2009
-------
2. CEN TS/14405, (2004), "Characterization of Waste - Leaching Behaviour Tests - Up-
flow Percolation Test (Under Specified Conditions)," European Committee for
Standardization (CEN), Brussels, Belgium.
3. D.S. Kosson, H.A. van der Sloot, F. Sanchez and A.C. Garrabrants, (2002), "An
Integrated Framework for Evaluating Leaching in Waste Management and Utilization of
Secondary Materials," Environmental Engineering Science, 19(3) 159-204.
4. D.S. Kosson, A.C. Garrabrants, H.A. van der Sloot, (2009), "Background Information for
the Development of Leaching Test Draft Methods 1313 through Method 1316," (in
preparation).
18.0 TABLES, DIAGRAMS, FLOWCHARTS, AND VALIDATION DATA
The following pages contain the tables and figures referenced by this method.
1314-18 Revision 1
December 2009
-------
TABLE 1
SCHEDULE OF FRACTION COLLECTIONS AND ANALYTICAL SAMPLES
Option
Fraction
Label
T01
T02
T03
T04
T05
T06
T07
T08
T09
ILS Ratio
(mL/g-dry)
0.2 ±0.1
0.5 ±0.1
1.0±0.1
1.5 ±0.2
2.0 ±0.2
4.5 ±0.2
5.0 ±0.2
9.5 ±0.2
10.0 ±0.2
A
Characterization
Cone.
V
V
•/
V
•/
V
•/
V
•/
IRel
V
V
s
V
s
V
s
V
s
B
C
Limited Analysis
Cone.
V
V
•/
•/
•/
•/
IRel
V
V
•/
I
^T05c
I
^T07c
I
^T09c
D
E
Index Testing
Cone.
V
•/
•/
IRel
V
I
1
I
^T05c
I
1
I
^T09c
NOTE: IRel = Cumulative release.
•/ = Collect eluate fraction (or pool of fractions) as analytical sample.
•I = composite eluate fraction with next fraction to create analytical sample.
TABLE 2
SCHEDULE OF ELUATE FRACTIONS FOR COLLECTION
WITH EXAMPLE VOLUMES
Interval
Label
T01
T02
T03
T04
T05
T06
T07
T08
T09
B01
End Point
ILS Ratio
(mL/g-dry)
0.2 ±0.1
0.5 ±0.1
1.0±0.1
1.5 ±0.2
2.0 ±0.2
4.5 ±0.2
5.0 ±0.2
9.5 ±0.2
10.0 ±0.2
Eluant
Fraction
ILS Ratio
(mL/g-dry)
0.2
0.3
0.5
0.5
0.5
1.5
0.5
4.5
0.5
Example
Fraction
Volume
(mL)
60
90
150
150
150
450
150
1350
150
100
NOTE: Example fraction volumes based on assumed packing mass of 300 g-dry.
1314- 19
Revision 1
December 2009
-------
FIGURE 1
EXAMPLE DATA REPORT FORMAT
ABC Laboratories
123 Main Street
Anytown, USA
Contact: John Smith
(555)111-1111
Material Code:
Material Type:
Date Received:
Test Date:
Report Date:
EPA METHOD 1314
Report of Analysis
Client Contact: Susan Jones
(555) 222-2222
XYZ
Coal Combustion Fly Ash
10/1/20XX
11/1/20xx
12/1/20xx
Particle Size:
Mass used in Column:
Moisture Content:
Column ID:
Packing Bed Depth:
Eluant:
Lab Temperature:
88% passing 2-mm sieve
360 g
0.002 gH2o/g
4.8 cm
28 cm
ASTMType II Water
21 ±2°C
Test
Position
T01
Test
Position
T02
Replicate
A
Eluate Sample ID
Collection Date
Collection Time
Eluate Mass
Eluate pH
Eluate Conductivity
Eluate ORP
Chemical Analysis
Al
As
Cl
Replicate
A
Eluate Sample ID
Collection Date
Collection Time
Eluate Mass
Eluate pH
Eluate Conductivity
Eluate ORP
Chemical Analysis
Al
As
Cl
Value
Units
Method
Note
XYZ-1314-T01-A
11/1/20XX
12:35
70.4
8.82
5.4
NA
Value
4.72
0.12
5.42
Value
PM
g
-
mS/c
mv
Units
mg/L
mg/L
mg/L
Units
EPA 9040
EPA 9050
QC
Flag Method
EPA 6020
EPA 6020
EPA 9056
Method
Dilution
Date Factor
11/7/20XX 1000
11/7/20xx 10
11/9/20xx 1
Note
XYZ-1314-T02-A
11/1/20XX
9:15
105.1
9.15
2.3
NA
Value
2.99
0.21
4.20
AM
g
-
mS/c
mv
Units
mg/L
mg/L
mg/L
QC
Flag Method
EPA 6020
EPA 6020
U EPA 9056
Dilution
Date Factor
11/7/20xx 1000
11/7/20xx 10
11/7/20xx 1
QC Flag Key: U Value below lower limit of quantitation as reported (< "LLOQ")
1314-20
Revision 1
December 2009
-------
FIGURE 2
METHOD 1314 FLOWCHART
Material of
Interest
Is mate rial at
appropriate
particle size?
Particle Size Reduction
(Section 11.1)
yes
Column Packing
(Section 11.4)
-x"
Solids/Moisture Content
(Section 11.2)
f
or
Eluant Collection Schedule
(Section 11.6)
Column Test Procedure
(Section 12)
Collection 9 eluate factions
Leachate pH, EC, Eh
• or
Characterization Limited Analysis Limited Analysis
Option A OptionB Option C
(Sec 12.5) (Sec 12.5) (Sec 12.5)
9 discrete samples 6 discrete samples 3 discrete samples
3 composite samples
!
or
.
or
Index Testing
Option D
(Sec 12.5)
3 discrete samples
Index Testing
Option E
(Sec 12. 5)
1 discrete sample
2 composite samples
Extract Analysis
Documentation and
Graphing
1314-21
Revision 1
December 2009
-------
FIGURES
SCHEMATIC OF COLUMN TEST APPARATUS
Luer shut-off
valve \.
air lock
eluant collection bottle(s)
end cap ->
subject _~
material
end cap ->
Luer shut-off -
valve
-t
(sized tor rrac
tion vomme)
?l-cm sand
layers
Luer fitting
^ ^ N? or Ar
(** \ (
f^-
o
r^\
\ o
\ J
4 e x o
(optional)
PumP eluant
reservoir
NOTE: Figure not drawn to scale
1314-22
Revision 1
December 2009
-------
FIGURE 4
EXAMPLE ELUATE CONCENTRATION CURVES FOR COMPLETE CHARACTERIZATION
OF A COAL COMBUSTION FLY ASH
1 UUUUU
10000 -
1000 •
100-
.y 10 -
0.1 -
DO0
)
MDL
cp
o
o
i uuuuu -
10000 -
1000
B> 100 -
^
£ 10 -
3
•c
•
0.1 -
^0 1
oo oo o°
ML
MDL
0 2 4 6 8 10 12 0 2 4 6 8 10 I
a' Cumulative LS Ratio Cumulative LS Ratio
i -| -| "tr-iri
1 UUUUU
10000 -
1CCO -
3, 100 -
10 -
1 ,.
0.1 -
0-,
D
!O
;
ML
)
MDL'
00
0
0
IUUU
100
10 -
5" ' "
BI
i, 0.1 -
1 ° 01 "
™ 0.001 -
0.0001 -
n nnnn-i
OQ
GO 00
. Ml
M
0 2 4 6 8 10 12 0 2 4 6 8 10 1.
Cumulative LS Ratio Cumulative LS Ratio
• 'i ~i,-, t r>
IUUU
100 -
10 -
t °1'
| 0.01 -
•| o.oi •
1 0001 -
"o
0.0001 -
n rwin i .
3DOO
i 0
0
t ° O
! l
MDI.
0 2 4 6 8 10
e) Cumulative LS Ratio
12
2 4 6 8 10 12
Cumulative LS Ratio
1314-23
Revision 1
December 2009
-------
FIGURES
EXAMPLE CUMULATIVE RELEASE CURVES FOR COMPLETE CHARACTERIZATION OF A
COAL COMBUSTION FLY ASH
iuu •
>^
10 .
en
x.
en
1
•
I "
5
0.1 i
/
O '1
0 / \
Q x 'slope =1
/
/
/
/
/
/ o
/
r ' o
/
s
/ 9...
iuu -
Bi
£
•
1
IB
TO
CD
0.1 •!
'
slope =1 x"1
'
F
/
/ 0
/ 8 C
ox
/
/
^o
0.1 1 10 100 0 1 10 1C
Cumulative LS Ratio Cumulative LS Ratio
1000 -
^
? 100 •
£
1
li
£ iu
0
slope =1 /
/
'
''O
X j
/o C
ox
/5
o^
f
10000 -I
>,
A) 100° '
§
£
«
1UU
<3
H'
1 2
r— i
; O°° ^
Ox
/
t
o 1 10 100 c 1 1: 10
Cumulative LS Ratio Cumulative LS Ratio
10 DOC
? 1000 •
100 •
£.
4
/ slope =1
X
/
/
/
/
0 'O 000
100 I
?>
•9 10 •
Ol
"?^
£
oT
1 •
|
It U. 1
0 1 10 100 0
;) Cumulative LS Ratio '
z
/' slope = 1
Qo/x<° °
0^
/
0
X 1
/o
/
1 1 10 1C
Cumulative LS Ratio
NOTE: Dashed line represents solubility control (slope = 1).
1314-24
Revision 1
December 2009
-------
APPENDIX C
METHOD 1315 -
U MASS TRANSFER RATES OF CONSTITUENTS IN MONOLITHIC
OR COMPACTED GRANULAR MATERIALS USING
A SEMI-DYNAMIC TANK LEACHING PROCEDURE
-------
PRELIMINARY VERSION1 OF METHOD 1315
MASS TRANSFER RATES OF CONSTITIUENTS IN MONOLITHIC OR COMPACTED
GRANULAR MATERIALS USING A SEMI-DYNAMIC TANK LEACHING PROCEDURE
SW-846 is not intended to be an analytical training manual. Therefore, method
procedures are written based on the assumption that they will be performed by analysts who are
formally trained in at least the basic principles of chemical analysis and in the use of the subject
technology.
In addition, SW-846 methods, with the exception of required method use for the analysis
of method-defined parameters, are intended to be guidance methods which contain general
information on how to perform an analytical procedure or technique which a laboratory can use
as a basic starting point for generating its own detailed Standard Operating Procedure (SOP),
either for its own general use or for a specific project application. The performance data
included in this method are for guidance purposes only, and are not intended to be and must not
be used as absolute quality control (QC) acceptance criteria for purposes of laboratory
accreditation.
1.0 SCOPE AND APPLICATION
1.1 This method is designed to provide the mass transfer rates (release rates) of
inorganic analytes contained in a monolithic or compacted granular material, under diffusion-
controlled release conditions, as a function of leaching time. Observed diffusivity and tortuosity
may be estimated through analysis of the resulting leaching test data.
1.2 This method is suitable to a wide range of solid materials which may be in
monolithic form (e.g., cements, solidified wastes) or may be compacted granular materials (e.g.,
soils, sediments, stacked granular wastes) which behave as a monolith in that the predominant
water flow is around the material and release is controlled by diffusion to the boundary.
1.3 This leaching characterization method provides intrinsic material parameters for
release of inorganic species under mass transfer-controlled leaching conditions. This test
method is intended as a means for obtaining a series of eluants which may be used to estimate
the diffusivity of constituents and physical retention parameter of the solid material under
specified laboratory conditions.
1.4 This method is not applicable to characterize the release of volatile or semi-
volatile organic analytes.
1.5 This method is a characterization method and does not provide a solution
considered to be representative of eluate under field conditions. This method is similar in
structure and use to predecessor methods such as MT001.1 (see Ref. 1), NEN 7345 (see Ref.
Preliminary Version denotes that this method has not been endorsed by EPA but is under consideration
for inclusion into SW-846. This method has been derived from published procedures (Kosson et al,
2002). The method has been submitted to the U.S. EPAU.S. EPA Office of Resource Conservation and
Recovery and is currently under review for development of interlaboratory validation studies to develop
precision and bias information.
1315-1 Revision 1
December 2009
-------
2), ANSI/ANS 16.1 (see Ref. 3), and ASTM C1308 (see Ref. 4). However, this method differs
from previous methods in that: (a) leaching intervals are modified to improve quality control, (b)
sample preparation accounts for mass transfer from compacted granular samples, and (c) mass
transfer may be interpreted by more complex release models that account for physical retention
of the porous medium and chemical retention at the pore wall through geochemical speciation
modeling
1.7 The geometry of monolithic samples may be rectangular (e.g., bricks, tiles),
cubes, wafers, cylinders. Samples may also have a variety of faces exposed to eluant forming
anything from 1-dimensional (1-D) through 3-dimensional (3-D) mass transfer cases. In all
cases, a minimum sample size of 5 cm in the direction of mass transfer must be employed and
the liquid-surface-area (LSa) ratio must be maintained at
9 ± 1 mL/cm2.
Monolithic samples should be suspended or held in the leaching fluid such that at least
98% of the entire sample surface area is exposed to eluant and the bulk of the eluant (e.g., a
minimum of 2 cm between any exposed surface and the vessel wall) is in contact with the
exposed sample surface. Figure 1 provides examples of appropriate sample holders and
leaching configurations for 3-D and 1-D cases.
1.8 Compacted granular materials are granular solids, screened to pass a
2-mm sieve, compacted following a modified Proctor compaction effort (see Ref. 5). The
sample geometry must be open-faced cylinders due to limitations of mechanical packing.
However, the diameter and height of the sample holder may be altered to correspond
appropriately with the diameter and volume of the leaching vessel. In all cases, the sample size
of at least 5 cm in the direction of mass transfer must be employed and the LSa ratio must be
maintained at 9 ± 1 mL/cm2.
The sample should be positioned at the bottom of the leaching vessel with a minimum of
5 cm of distance between the solid-liquid interface and the top of the vessel. The distance
between the non-leaching faces (i.e., outside of the mold surfaces) and the leaching vessel wall
should be minimized to < 0.5 cm, such that the majority of the eluant volume is on top of the
sample. Figure 2 shows an example of a holder and leaching configuration for a compacted
granular sample.
1.9 The solvent system used in this characterization method is reagent water.
Other systems (e.g., groundwater, seawater, and simulated liquids) may be used to infer
material performance under specific environmental conditions. However, interaction between
the eluant and the solid matrix may result in precipitation and pore blocking, which may interfere
with characterization or complicate data interpretation.
1.10 Prior to employing this method, analysts are advised to consult the base
method for each type of procedure that may be employed in the overall analysis (e.g., Methods
9040, 9045) for additional information on QC procedures, development of QC acceptance
criteria, calculations, and general guidance. Analysts also should consult the disclaimer
statement at the front of the manual and the information in Chapter Two for guidance on the
intended flexibility in the choice of methods, apparatus, materials, reagents, and supplies, and
on the responsibilities of the analyst for demonstrating that the techniques employed are
appropriate for the analytes of interest, in the matrix of interest, and at the levels of concern. In
addition, analysts and data users are advised that, except where explicitly specified in a
regulation, the use of SW-846 methods is not mandatory in response to Federal testing
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requirements. The information contained in this method is provided by EPA as guidance to be
used by the analyst and the regulated community in making judgments necessary to generate
results that meet the data quality objectives for the intended application.
1.11 Use of this method is restricted to use by, or under supervision of, properly
experienced and trained personnel. Each analyst must demonstrate the ability to generate
acceptable results with this method.
2.0 SUMMARY OF METHOD
This method comprises leaching of continuously water-saturated monolithic or
compacted granular material in an eluant-filled tank with periodic renewal of the leaching
solution. The vessel and sample dimensions are chosen such that the sample is fully immersed
in the leaching solution. Monolithic samples may be cylinders or parallelepipeds, while granular
materials are compacted into cylindrical molds at optimum moisture content using modified
Proctor compaction methods (see Ref. 5). In either case, the exposure of a regular geometric
area to the eluant is recommended. Samples are contacted with reagent water at a specified
LSa ratio. The leaching solution is exchanged with fresh reagent water at nine pre-determined
intervals (see NOTE below). The sample is freely drained and the mass is recorded to monitor
the amount of eluant absorbed into the solid matrix at the end of each leaching interval. The
eluate pH and specific conductance is measured for each time interval and analytical samples
are collected and preserved accordingly based on the determinative methods to be performed.
Eluate concentrations are plotted as a function of time, as a mean interval flux and as
cumulative release as a function of time. These data are used to estimate mass transfer
parameters (i.e., observed diffusivity) for each constituent of potential concern (COPC). A
flowchart for performing this method is shown in Figure 3.
NOTE: The leaching schedule may be extended for additional exchanges with individual
intervals of 14 days to provide more information about longer-term release.
3.0 DEFINITIONS
3.1 COPC — A chemical species of interest, which may or may not be regulated,
but may be characteristic of release-controlling properties of the sample geochemistry.
3.2 Release — The dissolution or partitioning of a COPC from the solid phase to
the aqueous phase during laboratory testing (or under field conditions). In this method, mass
release is expressed in units of mg COPC/kg dry solid material.
3.3 LSa ratio — The ratio representing the total liquid volume used in the leaching
interval to the external geometric surface area of the solid material. LSa ratio is typically
expressed in units of mL of eluent/cm2 of exposed surface area.
3.4 Observed mass diffusivity —the apparent, macroscopic rate of release due to
mass transfer from a solid into a liquid as measured using a leaching test under conditions
where mass transfer controls release. The observed diffusivity accounts for all physical and
chemical retention factors influencing mass transfer and is typically expressed in units of cm2/s.
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3.5 Effective mass diffusivity — The intrinsic rate of mass transfer in a porous
medium accounting for physical retention. The effective mass diffusivity is typically expressed
in units of cm2/s.
3.6 Physical retention factor — A mass transfer rate term that describes the
retardation of diffusion due to intrinsic physical properties of a porous medium (e.g., effective
porosity, tortuosity).
3.7 Chemical retention factor — A mass transfer rate term that describes the
chemical processes (e.g., dissolution/precipitation, adsorption/desorption, complexation)
occurring at the pore water interface with the solid mineral phases within the porous structure of
the solid material.
3.8 Refer to the SW-846 chapter of terms and acronyms for potentially applicable
definitions.
4.0 INTERFERENCES
4.1 Solvents, reagents, glassware, and other sample processing hardware may
yield artifacts and/or interferences to sample analysis. All of these materials must be
demonstrated to be free from interferences under the conditions of the analysis by analyzing
method blanks. Specific selection of reagents and purification of solvents by distillation in all-
glass systems may be necessary. Refer to each method to be used for specific guidance on
QC procedures and to Chapters Three and Four for general guidance on the cleaning of
laboratory apparatus prior to use.
4.2 The reaction of atmospheric gases can influence the measured concentrations
of constituents in eluates. For example, reaction of carbon dioxide with eluants from highly
alkaline or strongly-reducing materials will result in neutralization of eluate pH and precipitation
of carbonates. Leaching vessels, especially those used when testing highly alkaline materials,
should be designed to be air-tight in order to minimize the reaction of samples with atmospheric
gases.
4.3 Use of certain solvent systems may lead to precipitation at the material surface
boundary which may reduce mass transport rates. For example, exposure of cement-based
materials to seawater leads to sealing of the porous block (see Ref. 6).
5.0 SAFETY
This method does not address all safety issues associated with its use. The laboratory
is responsible for maintaining a safe work environment and a current awareness file of OSHA
regulations regarding the safe handling of the chemicals listed in this method. A reference file
of material safety data sheets (MSDSs) should be available to all personnel involved in these
analyses.
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6.0 EQUIPMENT AND SUPPLIES
The mention of trade names or commercial products in this manual is for illustrative
purposes only, and does not constitute an EPA endorsement or exclusive recommendation for
use. The products and instrument settings cited in SW-846 methods represent those products
and setting used during the method development or subsequently evaluated by the Agency.
Glassware, reagents, supplies, equipment, and setting other than those listed in this manual
may be employed provided that method performance appropriate for the intended application
has been demonstrated and documented.
This section does not list common laboratory glassware (e.g., beakers and flasks).
6.1 Sample holder
6.1.1 Monolithic samples
6.1.1.1 A mesh or structured holder constructed of an inert
material such as high-density polyethylene (HOPE) or other material resistant to
high and low pHs is recommended.
6.1.1.2 The holder should be designed such that at least 98%
of the sample external surface area may be exposed to eluant.
6.1.1.3 The holder should be designed to match the geometry
of the mass transfer such that the bulk of the eluant may be in contact with the
sample and the exposed surfaces of the sample centered within the leaching
fluid.
NOTE: In the case of 1-D mass transfer from the axial face of a cylindrical
sample, the outer diameter (OD) of the holder should be matched as
closely as possible to the inner diameter (ID) of the leaching vessel so
that the majority of the eluant is above the sample (e.g., in contact with
the exposed material surface), while allowing for easy placement and
removal of the holder in the leaching vessel (see Figure 1).
6.1.2 Compacted granular samples
6.1.2.1 A cylindrical mold constructed of an inert material such
as HOPE or other material resistant to high and low pH is recommended.
6.1.2.2 The holder should be capable of withstanding the
compaction force required to prepare the sample (see Sec 11.3.5) without
breaking or distorting.
NOTE: The outer diameter of the holder for a compacted granular sample
should be matched as closely as possible to the inner diameter of the leaching
vessel so that the majority of the eluant is above the sample (e.g., in contact
with the exposed material surface) while allowing for easy placement and
removal of the holder in the leaching vessel.
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6.2 Leaching vessel
6.2.1 A straight-sided container constructed of a material resistant to high
and low pH is recommended. Jars or buckets composed of HOPE, polycarbonate (PC),
polypropylene (PP), or polyvinyl chloride (PVC) are recommended when evaluating the
mobility of inorganic species.
6.2.2 The leaching vessel should have an air-tight seal that can sustain
long periods of standing without gas exchange with the atmosphere.
6.2.3 The container must be of sufficient volume to accommodate both
the solid sample and an eluant volume based on an LSa ratio of 9 ± 1 ml_ eluant/cm2
sample surface area. Ideally, the vessel should be sized such that the headspace is
minimized within the tolerance of the LSa ratio.
6.3 Leaching setup
Example photos of three possible leaching equipment arrangements for monolithic and
compacted granular samples are shown in Figures 1 and 2, respectively. The equipment used
in the each of these cases is described below.
6.3.1 Figure 1a shows a monolithic sample 3-D configuration with the
following accessories:
Sample holder— PP sink washers, 43-mm OD, 37-mm ID, 6-mm high, with
four holes drilled at the quadrants to accept
2-mm OD nylon string knotted at top.
Sample stand — PVC pipe, 47-mm OD, 51-mm high, cut to have four legs
approximately 8-mm wide and 30-mm high.
Leaching Vessel — PP bucket, 140-mm ID at top, 120-mm ID at bottom,
200-mm high (Berry Plastics #T51386CP3, VWR Scientific, or equivalent).
6.3.2 Figure 1b shows a monolithic sample 1-D configuration with the
following accessories:
Sample holder— Polyethylene (PE) mold, 54-mm OD, 100-mm high
(MA Industries, Peach Tree City, GA, or equivalent), with the test sample cured in mold
and cut to 51-mm high.
Leaching vessel — 250-mL PC jar, (60-mm ID, 100-mm high, (Nalgene #2116-
0250, Fisher Scientific, or equivalent).
6.3.3 Figure 2 shows a compacted granular sample 1-D Configuration
with the following accessories:
Sample holder— PE mold, 100-mm OD, 200-mm high, (MA Industries, Peach
Tree City, GA, or equivalent) cut to 63-mm high with three tabs drilled for 0.7-mm fishing
line knotted at the top.
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Leaching vessel — 1000-mL PC jar, 110-mm ID at top, 130-mm high (Nalgene
#2116-1000, Fisher Scientific, or equivalent).
Glass beads, borosilicate — 2-mm diameter
6.4 Filtration apparatus — Pressure- or vacuum-filtering apparatus made of
appropriate materials to maximize the collection of extracts and minimize the loss of COPCs
(Nalgene #300-4000 or equivalent).
6.5 Filtration membranes — Composed of hydrophilic PP or similar material with an
effective pore size of 0.45-um (e.g., Andwin Scientific GH Polypro 28143-288 or equivalent).
6.6 pH Meter — Laboratory model with the capability for temperature compensation
(e.g., Accumet 20, Fisher Scientific or equivalent) and a minimum resolution of 0.1 pH units.
6.7 pH combination electrode — Composed of chemically-resistant materials.
6.8 Conductivity meter — Laboratory model (e.g., Accumet 20, Fisher Scientific or
equivalent), with a minimum resolution of 5% of the measured value.
6.9 Conductivity electrodes — Composed of chemically-resistant materials.
6.10 Proctor compactor (for compacted granular samples only) — Equipped with a
slide hammer capable of dropping a 4.5-kg weight over a 0.46-m interval (see Ref. 5 for further
details).
7.0 REAGENTS AND STANDARDS
7.1 Reagent-grade chemicals must be used in all tests. Unless otherwise
indicated, it is intended that all reagents conform to the specifications of the Committee on
Analytical Reagents of the American Chemical Society, where such specification are available.
Other grade may be used, provided it is first ascertained that the reagent is of sufficiently high
purity to permit its use without lessening the accuracy of the determination.
7.2 Reagent water must be interference free. All references to water in this method
refer to reagent water unless otherwise specified.
7.3 Other reagents may be used in place of reagent water on a case-specific basis.
8.0 SAMPLE COLLECTION, PRESERVATION, AND STORAGE
8.1 See the introductory material to Chapter Three "Inorganic Analytes."
8.2 Both plastic and glass containers are suitable for the collection of samples. All
sample containers must be prewashed with a metal-free detergent and triple rinsed with nitric
acid and reagent water, depending on the history of the container. For further information, see
Chapter Three.
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9.0 QUALITY CONTROL
9.1 Refer to Chapter One for guidance on quality assurance (QA) and QC
protocols. When inconsistencies exist between QC guidelines, method-specific QC criteria take
precedence over both technique-specific criteria and those criteria given in Chapter One, and
technique-specific QC criteria take precedence over the criteria in Chapter One. Any effort
involving the collection of analytical data should include development of a structured and
systematic planning document, such as a Quality Assurance Project Plan (QAPP) or a Sampling
and Analysis Plan (SAP), which translates project objectives and specifications into directions
for those that will implement the project and assess the results. Each laboratory should
maintain a formal quality assurance program. The laboratory should also maintain records to
document the quality of the data generated. All data sheets and quality control data should be
maintained for reference or inspection.
9.2 Method blanks - In order to demonstrate the purity of reagents and container
surfaces, a method blank should be tested for each leaching interval. Refer to Chapter One for
specific QC procedures.
9.3 The analysis of extracts should follow appropriate QC procedures, as specified
in the determinative methods for the COPCs. Refer to Chapter One for specific quality control
procedures.
10.0 CALIBRATION AND STANDARDIZATION
10.1 The balance should be calibrated and certified at a minimum annually or in
accordance with laboratory policy.
10.2 Prior to measurement of eluate pH, the pH meter should be calibrated using a
minimum of two standards that bracket the range of pH measurements. Refer to Methods 9040
and 9045 for additional guidance.
10.3 Prior to measurement of eluate conductivity, the meter should be calibrated
using at least one standard at a value greater than the range of conductivity measurements.
Refer to Method 9050 for additional guidance.
11.0 PREPARATORY PROCEDURES
A flowchart of this method, including preparatory and leaching procedures, is shown in
Figure 3.
11.1 Determination of solids and moisture content
The moisture and solids content of the sample material are used to relate
leaching results to dry-material masses. When preparing compacted granular samples
for testing, the moisture content or solid content is used to determine the optimum
moisture content following the modified Proctor test. This method calculates moisture
content on the basis of the "wet" or "as tested" sample.
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WARNING: The drying oven should be contained in a hood or otherwise properly
ventilated. Significant laboratory contamination or inhalation hazards may
result when drying heavily contaminated samples. Consult the laboratory
safety officer for proper handling procedures prior to drying samples that
may contain volatile, hazardous, flammable or explosive materials.
11.1.1 Place a 5-10-g sample of solid material into a clean, pre-weighed
dish or crucible. Dry the sample to a constant mass at 105 ± 2 °C. Periodically check
the sample mass after allowing the sample to cool to room temperature (20 ± 2 °C) in a
desiccator.
NOTE: The oven-dried sample is not used for the extraction and should be properly
disposed of once the dry mass is determined.
11.1.2 Calculate and report the solids content as follows:
test
Where: SC = solids content (g-dry/g)
Mdry = mass of oven-dried sample (g-dry)
Mtest = mass of "as-tested" sample (g)
11.1.3 Calculate and report the moisture content (wet basis) as follows:
Mtest ~ Mdry
wet = - - ~
test
Where: MC(wet) = moisture content
l\/l . — mooo r\f r\war»_rlriarl
MC(Wet) = moisture content on a wet basis (gH o/g)
Mdry = mass of oven-dried sample (g-dry)
Mtest = mass of "as-tested" sample (g)
11.2 Preparation of monolithic samples
11.2.1 If the material to be tested is granular, disregard this section and
proceed to Sec. 11.3.
11.2.2 A representative sample of monolithic material should be obtained
by molding material components in place (e.g., cementitious media) or by coring or
cutting a sample from a larger existing specimen.
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11.2.3 The geometry of monolithic samples may be rectangular (e.g.,
bricks, tiles), cubes, wafers, cylinders. Samples may also have a variety of faces
exposed to eluant forming 1-, 2-, or 3-D mass-transfer cases. Example monolithic
sample leaching setups are shown in Figure 1.
11.2.4 A minimum sample size of 5 cm in the direction of mass transfer
must be employed and the LSa ratio must be maintained at 9 ± 1 mL/cm2.
NOTE: Since, the sample holder and leaching vessel must correspond to the
specifications in Sec 6.1, it is often easier to modify the sample size and
geometry rather than the holder and vessel dimensions.
11.2.5 Proceed to Sec. 12.0.
11.3 Preparation of compacted granular samples
Compacted granular materials, for most cases, must be open-faced cylinders due to the
limitations of mechanical packing. However, the diameter and height of the sample holder may
be altered to work appropriately with the diameter and volume of the leaching vessel. In all
cases, a minimum sample size of 5 cm in the direction of mass transfer must be employed and
the LSa ratio must be maintained at 9 ± 1 mL/cm2.
Granular samples are compacted into the sample holder using a variation on the
modified Proctor compaction (see Ref. 5) to include the use of 6-cm high test molds compacted
in three layers (rather than the five layers specified in Ref. 5) to maintain the total compaction
effort. The granular sample should be compacted at optimum moisture content in order to
obtain packing densities that approximate field conditions. Optimum moisture content refers to
the amount of moisture or fractional mass of water (gH2o/g material) in the granular sample that
is present at the optimum packing density (g-dry material/cm3). Optimum packing density is
defined in Ref. 5. The optimum moisture content of the test material is determined from a
pretest measuring the packing density of granular materials compacted at different levels of
moisture content.
11.3.1 Pre-test to determine optimum moisture content
The pre-test is conducted as a series of five batch-wise packing trials with
consecutive increases in moisture content until the maximum packing density has been
surpassed. The optimum moisture content is determined as the maximum of a third-
order polynomial fit through the graph of dry-packing density as a function of moisture
content (wet basis).
11.3.1.1 Place 1500 g of "as received" material into a pail or
bowl and mix well by hand to homogenize. As an alternate to hand mixing, a
mechanical paddle mixer may used.
NOTE: The pretest may be conducted from a bulk supply of solid material
(e.g., 10 kg total for five batches) as long as the starting mass for each
trial is recorded and incremental water additions are used.
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1.3.1.2 Mix a known amount of tap water with the bulk material
in the pail or bowl until homogenized based on visual inspection. For the first
point in the pre-test, no water needs to be added.
NOTE: The amount of water added should be enough increase the moisture
content in approximately 3-5% increments. Smaller additions may be
needed in order to provide finer resolution of the packing density as a
function of moisture content curve.
11.3.1.3 Calculate the new moisture content for the trial as
follows:
_ Mtest x MCwet + Wadded
(wet) ~ M + w
lvltest T
Where: MC(Wet) = moisture content (wet basis) of the pre-test trial (gH2o/g)
Mtest = mass of "as-tested" material used in the trial (g)
MC(Wet) = moisture content (wet basis) of the "as-tested"
material (gH2o/g)
Wadded = mass of water added to the "as-tested" material (gH o/g)
11.3.1.4 Compact approximately 1000 g of material into a pre-
tared 10-cm diameter mold into three consecutive layers of material. The
compacted mass should have a level flat surface as a top face.
11.3.1.5 Measure and record the height, diameter, and mass of
the resulting compacted material.
11.3.1.6 Calculate and record the packing density (dry basis) as
follows:
mxSC
Where: ppack = packing density (dry basis) (g-dry/cm3)
m = mass of the compacted sample (g)
SC = solids content of the "as -received" granular material (g-
dry/g)
d = measured diameter of the compacted sample (cm)
h = measured height of the compacted sample (cm)
11.3.1.7 Repeat Sees. 11.3.1.1-11.3.1.6 for four subsequent
trials until the value of the calculated packing density decreases.
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11.3.1.8 Plot the packing density as a function of moisture
content. Figure 4 shows an example of a packing density curve.
11.3.1.9 Determine the optimum moisture content at the
maximum of the packing density curve. This value may be read directly from
the graph or determined by the maximum of a third-order polynomial fit through
the five pre-test data points (see the provided Microsoft® Excel Template).
11.3.2 Compacted granular test sample preparation
11.3.2.1 Using the optimum moisture content determined in
Sec. 11.3.1.9, calculate the amount of "as-received" material that is required to
pack the sample holder to within 3 mm of the rim of the holder.
_ popt x TT x (h - 0.3 )
I)'
Where: Mtest = mass of "as tested" sample (g)
p0pt = optimal packing density (dry basis) (g-dry/cm3)
determined in Sec. 11.3.1.9.
SC = solids content of the "as received" granular material (g-dry/g)
d = measured diameter of the sample mold (cm)
h = measured height of the sample mold (cm)
11.3.2.2 Adjust the moisture content of the "as-received"
material to the optimum moisture content using reagent water and mix until
homogenized.
11.3.2.3 Pack the sample material into the sample holder using
the modified Proctor compaction as described in Ref. 5.
11.3.2.4 Place a mono-layer of borosilicate glass beads (Sec.
6.3.3) on the exposed sample surface to minimize scouring and mass loss
during testing.
11.3.2.5 Begin the leach test procedure promptly or cover the
sample with plastic wrap to minimize moisture loss to the atmosphere.
12.0 LEACHING PROCEDURE
This protocol is a semi-dynamic, tank-leaching procedure (see schematic in Figure 5)
where the sample is exposed to eluate for a series of leaching intervals interspersed with eluant
exchanges. The chemical composition of each eluate is determined and mass transfer from the
bulk solid is determined as a function of cumulative leaching time. The schedule of leaching
intervals for this method is shown in Table 1.
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12.1 Pre-test measurements
12.1.1 For the surface area calculation, measure and record the
dimensions of the test specimen (i.e., diameter and height for a cylinder; length,
width and depth for a parallelepiped; or diameter of exposed surface for a
compacted granular sample).
12.1.2 Measure and record the mass of the specimen. This value should
be monitored for each eluant exchange.
12.1.3 If a holder is used, place the specimen in the monolith holder.
12.1.4 Measure and record the mass of the specimen and holder, if
applicable.
12.1.5 The recommended temperature for conducting this method is room
temperature (20 ± 2 °C). When conducted at temperatures readings or variations other
than those recommended, record the ambient temperature at each eluant renewal.
12.2 Eluant exchange
12.2.1 Fill a clean leaching vessel with the required volume of reagent
water based on an LSa ratio of 9 ± 1 mL/cm2. Record the amount of eluant used.
12.2.2 Carefully place the specimen or the specimen and holder in the
leaching vessel (Figure 6a) so that the sample is centered in the eluant (see Figure 6b).
Submersion should be gentle enough so that the physical integrity of the monolith is
maintained and scouring of the solid is minimized.
12.2.3 Cover the leaching vessel with the air-tight lid and place in a safe
location until the end of the leaching interval. Table 1 shows the schedule of leaching
intervals and cumulative release times for this method.
12.2.4 Prior to the end of the leaching interval, repeat Sec. 12.2.1 in order
to prepare a vessel for the next leaching interval.
12.2.5 At the end of the leaching interval (see Table 1), carefully remove
the specimen or the specimen and holder from the vessel (Figure 6c). Drain the
liquid from the surface of the specimen into the eluate for approximately 20 sec.
12.2.6 Measure and record the mass of the specimen or the mass of the
specimen and holder (Figure 6d).
NOTE: The change in sample mass between intervals is an indication of the potential
absorption of eluant by the matrix (mass gain) or erosion of the matrix (mass
loss). In the case where a holder is used, moisture may condense on the holder
during the leaching intervals and sample absorption may not be evident.
CAUTION: Mass gain may also be indicative of carbonate precipitation if the vessel is
not tightly sealed and carbon dioxide is absorbed from the atmosphere.
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12.2.7 Place the specimen or the specimen and holder into the clean
leaching vessel filled with new eluant as prepared in Sec. 12.2.4.
12.2.8 Cover the new leaching vessel with the air-tight lid and place in a
safe location until the end of the leaching interval.
12.3 Eluate processing
12.3.1 Measure and record the pH, specific conductivity, and oxidation-
reduction potential (ORP) (optional, but strongly recommended) of the eluate of the
decanted eluate from the previous leaching interval (see Methods 9040, 9045, and
9050).
12.3.2 Filter the remaining eluate through a 0.45-um membrane (Sec. 6.5).
12.3.3 Immediately, preserve and store the volume(s) of eluate required for
chemical analysis. Preserve all analytical samples in a manner that is consistent with
the determinative chemical analyses to be performed.
12.3.4 Collect all subsequent eluate by repeating the eluant exchange and
eluate processing procedures in Sees. 12.2 and 12.3.
13.0 DATA ANALYSIS AND CALCULATIONS
13.1 Data reporting
Figure 7 shows an example of a data sheet which may be used to report the
concentrations results of this method. This example is included in the Excel template. At a
minimum, the basic test report should include the following:
a) Name of the laboratory
b) Laboratory contact information
c) Date and time at the start of the test
d) Name or code of the solid material
e) Material Description (including monolithic or compacted granular)
f) Moisture content of material used (gH2o/g)
g) Dimensions (cm) and geometry of sample used
h) Mass of solid material used (g)
i) Mass of sample and holder at start of test (g)
j) Eluate type (e.g., reagent water)
k) Eluate specific information (see below)
The minimum set of data that should be reported for each eluate includes:
a) Eluate sample ID
b) Target eluant exchange date and time
c) Actual eluant exchange date and time
d) Volume of eluant used (mL)
e) Mass of sample and holder (g)
f) Measured eluate pH
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g) Measured eluate conductivity (mS/cm)
h) Measured ORP (mV) (optional)
i) Concentration of all COPCs
j) Analytical QC qualifiers as appropriate
13.2 Data presentation
13.2.1 Interval concentrations
13.2.1.1 At the conclusion of the schedule of leaching intervals
(see Table 1), the concentration of COPCs in each eluate may be plotted as a
function of cumulative leaching time. An example of this is shown in Figure 8
for mass transport from a monolithic field sample of fixated scrubber sludge and
lime.
13.2.1.2 If data is available from Method 1313, interval
concentrations and Method 1313 data may be plotted on the same graph as a
function of eluate pH. This QC step is conducted in order to determine if the
concentration of COPCs approached equilibrium in any leaching interval
(i.e., the driving force for mass transport from the matrix may not be constant
which is a common assumption of dynamic-tank leach testing). Figure 9 shows
this type of graph for the release from a field sample of fixated scrubber sludge
and lime.
13.2.2 Interval mass release
At the conclusion of the schedule of leaching intervals (see Table 1), the
interval mass released can be calculated for each leaching interval as follows:
Where: Mt. = Mass released during the current leaching interval i (mg/m2)
d = constituent concentration in the eluate for interval i (mg/L)
Vj = eluate volume in interval i (L)
A = specimen external geometric surface area exposed to
the eluant (m2)
13.2.3 Mean interval flux
The flux of a COPC in an interval may be plotted as a function of the
generalized mean of the square root of cumulative leaching time (-^/T). An example of a
flux graph is show in Figure 10 for the release from a field sample of fixated scrubber
sludge with lime. This graph may be used to interpret the mechanism of release (see
Ref. 7. for further details).
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13.2.3.1 The flux across the exposed surface of the sample can
be calculated by dividing the interval mass release by the interval duration as
follows:
Fi =
Where Fj = flux for interval, i (mg/m2-s)
Mi= mass released during the current leaching interval i (mg/m2)
tj = cumulative time at the end of the current leaching interval i (s)
tj_i = cumulative time at the end of the previous leaching
interval i-1 (s)
13.2.3.2 The time used to plot each interval mass is the
generalized mean of the square root of the cumulative leaching time using the
cumulative time at the end of the ith interval, tj, and the cumulative time at the
end of the previous interval, IM.
Where tj: = generalized mean leaching time for the current interval, i (s)
tj = cumulative time at the end of the current leaching interval, i (s)
tj_i = cumulative time at the end of the previous leaching
interval, i-1 (s)
NOTE: If the concentrations of a COPC in the eluates approach that shown in
Method 1313 for liquid-solid equilibrium, the flux curve will show the
pattern in Figure 10 with intervals of the same duration having the same
flux value. When the eluate concentration approaches saturation, the
driving force for mass transfer approaches zero, interval flux is limited,
and intervals with like durations will display similar flux limitations.
13.2.4 Cumulative release
13.2.4.1 The interval release calculated in 13.2.2 can be
summed to provide the cumulative mass release as a function of leaching time.
Figure 11 shows the cumulative release curves for a field sample of fixated
scrubber sludge with lime.
13.2.4.2 Interpretation of the cumulative release of constituents
is illustrated using the analytical solution for simple radial diffusion from a
cylinder into an infinite bath presented by Crank (see Ref. 6).
1315-16 Revision 1
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M,=2pC0
Where: Mt = cumulative mass released during leaching interval, i (mg/m2)
p = density of the "as-tested" sample (kg/m3)
C0 = concentration o
Dobs = observed diffu
t = leaching time (s)
C0 = concentration of available COPC in the solid matrix (mg/kg)
Dobs = observed diffusivity (m2/s)
When transformed to a log-log scale, the analytical solution
presented by Crank becomes becomes linear with the square root of time.
log[Mt ]=log
2pCc
("f
Thus, under the assumptions of the analytical solution presented by
Crank, the mass release should be proportional to the square root of time. A
line showing the square root of time is plotted in Figure 11 along with the data.
Since flux is the derivative of release, a similar treatment of flux as a function of
leaching time using the simple diffusion model would be proportional to the
negative square root of time as shown in Figure 10.
Other models than the simple diffusion model presented by Crank
may also be used to interpret mass release. For example, the Shrinking
Unreacted Core Model (see Ref. 8) and the Coupled Dissolution-Diffusion
Model (see Ref. 9) incorporate chemical release parameters (e.g., as derived
from Method 1313 data) into the model to better estimate release mechanisms
and predictions (see Ref. 7 for further details).
13.2.5 Observed diffusivity
An observed diffusivity for each COPC can be determined using the logarithm
of the cumulative release plotted versus the logarithm of time. In the case of a diffusion-
controlled mechanism, this plot is expected to be a straight line with a slope of 0.5. An
observed diffusivity can then be determined for each leaching interval where the slope is
0.5 ±0.15 (see Refs. 10 and 11) by the following:
1315-17 Revision 1
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Where: D°bs = observed diffusivity of a COPC for leaching
interval, i (m2/s)
Mt. = mass released during leaching interval, i (mg/m2)
tj = cumulative contact time after leaching interval, i (s)
tj_i = cumulative contact time after leaching interval, i -1 (s)
C0 = initial leachable content (i.e., available release
potential) (mg/kg)
p = sample density (kg-dry/m3)
The mean observed diffusivity for each COPC is then determined by taking the
average of the interval observed diffusivities. It should be reported with the computed
uncertainty (i.e., standard deviation).
NOTE: Since the analysis presented above assumes a diffusion process, only those
interval mass transfer coefficients corresponding to leaching intervals with
slopes of 0.50 ±0.15 are included in the overall average mass-transfer
coefficient.
13.3 Data representation by constituent
A concise representation of all relevant data for a single constituent may be presented
as shown in Figure 12 for arsenic from a field core of FSSL material. The data shows eluate pH
generation as a function of leaching time (Figure 12a), comparison between eluate
concentrations and Method 1313 data as a function of eluate pH (Figure 12b), constituent flux
as a function of generalized mean cumulative leaching time (Figure 12c), and constituent
release as a function of cumulative leaching time (Figure 12d).
14.0 METHOD PERFORMANCE
14.1 Performance data and related information are provided in SW-846 methods
only as examples and guidance. The data do not represent required performance criteria for
users of the methods. Instead, performance criteria should be developed on a project-specific
basis, and the laboratory should establish in-house QC performance criteria for the application
of this method. These performance data are not intended to be and must not be used as
absolute QC acceptance criteria for purposes of laboratory accreditation.
14.2 Refs. 1 and 7 may provide additional guidance and insight on the use,
performance and application of this method.
15.0 POLLUTION PREVENTION
15.1 Pollution prevention encompasses any technique that reduces or eliminates the
quantity and/or toxicity of waste at the point of generation. Numerous opportunities for pollution
prevention exist in laboratory operations. The EPA has established a preferred hierarchy of
1315-18 Revision 1
December 2009
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environmental management techniques that places pollution prevention as the management
option of first choice. Whenever feasible, laboratory personnel should use pollution prevention
techniques to address their waste generation. When wastes cannot be feasibly reduced at the
source, the Agency recommends recycling as the next best option.
15.2 For information about pollution prevention that may be applicable to
laboratories and research institutions consult Less is Better: Laboratory Chemical Management
for Waste Reduction available from the American Chemical Society's Department of
Government Relations and Science Policy, 1155 16th St., N.W. Washington, D.C. 20036,
http://www.acs.org.
16.0 WASTE MANAGEMENT
The Environmental Protection Agency requires that laboratory waste management
practices be conducted consistent with all applicable rules and regulations. The Agency urges
laboratories to protect the air, water, and land by minimizing and controlling all releases from
hoods and bench operations, complying with the letter and spirit of any sewer discharge permits
and regulations, and by complying with all solid and hazardous waste regulations, particularly
the hazardous waste identification rules and land disposal restrictions. For further information
on waste management, consult The Waste Management Manual for Laboratory Personnel
available from the American Chemical Society at the address listed in Sec. 15.2.
REFERENCES
1. D.S. Kosson, H.A. van der Sloot, F. Sanchez and A.C. Garrabrants (2002) "An
Integrated Framework for Evaluating Leaching in Waste Management and Utilization of
Secondary Materials," Environmental Engineering Science, 19(3) 159-204.
2. NEN 7345 (1995) "Leaching Characteristics of Solid Earth and Stony Materials -
Leaching Tests - Determination of the Leaching of Inorganic Constituents from Molded
and Monolithic Materials with the Diffusion Test," Dutch Standardization Institute, Delft,
The Netherlands.
3. ANSI/ANS 16.1 (1986) "American National Standard Measurement of the Leachability of
Solidified Low-Level Radioactive Wastes by a Short-term Test Procedure," American
Nuclear Society, La Grange Park, IL.
4. ASTM D1308-95 (2001) "Standard Method for Accelerated Leach Test for Diffusive
Releases from Solidified Waste and a Computer Program to Model Diffusive, Fractional
Leaching from Cylindrical Waste Forms," ASTM International, West Conshohocken, PA.
5. ASTM D1557-07 "Standard Method for Laboratory Compaction Characteristics of Soil
Using Modified Effori
Conshohocken, PA.
Using Modified Effort (56,000 ft-lbf/ft3 (2,700 kN-m/m3))," ASTM International, West
6. D.E. Hockley and H.A. van der Sloot (1991) "Long-term Processes in a Stabilized Coal-
Waste Block Exposed to Seawater," Environmental Science and Technology, 25(8),
1408-1414.
1315-19 Revision 1
December 2009
-------
7. D.S. Kosson, A.C. Garrabrants, H.A. van der Sloot (2009) "Background Information for
the Development of Leaching Test," Draft Methods 1313 through Method 1316, (in
preparation).
8. Crank (1986) Mathematics of Diffusion, Oxford University Press, London.
9. Hinsenveld, and P.L. Bishop (1996) "Use of the shrinking core/exposure model to
describe the leachability from cement stabilized wastes," in Stabilization and
Solidification of Hazardous, Radioactive, and Mixed Wastes, 3rd Volume, ASTM STP
1240, T. M. Gilliam and C. C. Wiles (eds), American Society for Testing and Materials,
Philadelphia, PA.
10. Sanchez (1996) "Etude de la lixiviation de milieux poreux contenant des especes
solubles: Application au cas des dechets solidifies par Hants hydrauliques," doctoral
thesis, Institut National des Sciences Appliquees de Lyon, Lyon, France.
11. IAWG (1997) Municipal Solid Waste Incinerator Residues, International Ash Working
Group, Elsevier Science Publishers, Amsterdam, the Netherlands.
12. J. de Groot, and H. A. van der Sloot (1992) "Determination of Leaching Characteristics
of Waste Materials Leading to Environmental Product Certification," in Solidification and
Stabilization of Hazardous, Radioactive, and Mixed Wastes, 2nd Volume, ASTM STP
1123, T. M. Gilliam and C. C. Wiles (eds), American Society for Testing and Materials,
Philadelphia, PA.
13. A.C. Garrabrants and D.S. Kosson (2005) "Leaching Processes and Evaluation Tests for
Inorganic Constituents Release from Cement-Based Matrices," in
Solidification/Stabilization of Hazardous, Radioactive and Mixed Wastes, R Spence and
C. Shi (eds.), CRC Press.
18.0
TABLES, DIAGRAMS, FLOWCHARTS, AND VALIDATION DATA
The following pages contain the tables and figures referenced by this method
1315-20 Revision 1
December 2009
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TABLE 1
SCHEDULE OF ELUATE RENEWALS
Interval Label
T01
T02
T03
T04
T05
T06
T07
T08
T09
Interval
Duration
(h)
2.0 ± 0.25
23.0 ± 0.5
23.0 ± 0.5
-
-
-
-
-
-
Interval
Duration
(d)
-
-
-
5.0 ± 0.1
7.0 ± 0.1
14.0 ± 0.1
14.0 ± 0.1
7.0 ± 0.1
14.0 ± 0.1
Cumulative
Leaching Time
(d)
0.08
1.0
2.0
7.0
14.0
28.0
42.0
49.0
63.0
NOTE: This schedule may be extended for additional 14-day contact
intervals to provide more information regarding longer-term
release.
1315-21
Revision 1
December 2009
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FIGURE 1
EXAMPLES OF MONOLITHIC SAMPLE HOLDERS
a) 3-D Configuration
Sample Holder
b) 1-D Configuration
Sample. Holder and Stand
3-D Leaching Setup
Empty Sample Holder
Full Sample Holder
1-D Leaching Setup
1315-22
Revision 1
December 2009
-------
FIGURE 2
EXAMPLE COMPACTED GRANULAR SAMPLE HOLDER AND SETUP
Empty Sample Holder
Compacted Sample
1-D Leaching Setup
1315-23
Revision 1
December 2009
-------
FIGURES
METHOD 1315 FLOWCHART
Material of
Interest
_y
Solids/Moisture Content
(Section 11.1)
Is the
material
monolithic?
no
Compaction Pre-Test
(Section 11.3.1)
Sample Preparation
(Section 11.2)
.
Sample Preparation
(Section 11.3.2)
Leaching Procedure
(Section 12)
Pre-Test Measurements (Sec 12.1)
Eluant Exchange (Sec 12.2)
Eluate Processing (Sec 12.3)
Extract Analysis
Documentation and
Graphing
•
1315-24
Revision 1
December 2009
-------
FIGURE 4
EXAMPLE CURVE OF PACKING DENSITY AS A FUNCTION OF MOISTURE CONTENT
y = 55.975x3 - 65.036x2 + 1.8352
r2 = 0.983
rr*
o
I
O)
c
2.65
2.60
2.55
2.50
2.45
Q. 2 40 -
S
2.35 i
2.30
maximum density
2.576 g-dry/cm3
0.00
optimum moisture
0.120gH20/g
0.05
0.10
0.15
0.20
Moisture Content [9H20/Q]
0.25
1315-25
Revision 1
December 2009
-------
FIGURES
SCHEMATIC OF SEMI-DYNAMIC MASS TRANSFER TEST PROCESS
1 Sample
Monolith
(all faces exposed)
Compacted Granular
(1 circular face exposed)
n Leaching Intervals
analytical
samples
Figure obtained and modified from Ref. 11.
1315-26
Revision 1
December 2009
-------
FIGURES
EXAMPLE LEACHING PROCEDURE STEPS
Start of Leaching Interval
Sample Centered in Eluant (top view)
Removing Sample for Exchange
Mass of Sample and Holder
1315-27
Revision 1
December 2009
-------
FIGURE?
EXAMPLE DATA REPORTING SHEET
ABC Laboratories
123 Main Street
Anytown, USA
Contact: John Smith
(555)111-1111
EPA METHOD 1315
Report of Analysis
Client Contact: Susan Jones
(555) 222-2222
Material Code: XYZ
Material Type: Coal Combustion Fly Ash
Date Received : 1 0/1 /20xx
Test Start Date: 11/1/20xx
Report Date: 12/1/20xx
Test Type: Compacted Granular
Eluant: ASTM Type II Water
Test
Position
T01
Test
Position
T02
Replicate
A
Eluate Sample ID
Exchange Date
Target Exchange Time
Actual Exchange Time
Mass of Sample & Holder
Eluate Mass
Eluate pH
Eluate Conductivity
Eluate ORP
Chemical Analysis
Al
As
Cl
Replicate
A
Eluate Sample ID
Exchange Date
Target Exchange Time
Actual Exchange Time
Mass of Sample & Holder
Eluate Mass
Eluate pH
Eluate Conductivity
Eluate ORP
Chemical Analysis
Al
As
Cl
Value
Units
Particle Size:
Mass used in Column:
Moisture Content:
Sample Geometry:
Sample Diameter
Sample Depth:
Mass of Sample & Holder
Lab Temperature:
Method
88% passing 2-mm
860 g
0.002 gH2o/g
Cylinder
10.0cm
60.3cm
1020g
21 ±2°C
Note
sieve
XYZ-1315-T01-A
11/1/20xx
12:00
12:15
1026
730.4
8.82
5.4
NA
Value
4.72
0.12
5.42
Value
PM
PM
g
g
-
mS/c
mv
Units
mg/L
mg/L
mg/L
Units
EPA 9040
EPA 9050
QC
Flag Method
EPA 6020
EPA 6020
EPA 9056
Method
Date
11/7/20xx
11/7/20xx
11/9/20xx
Note
Dilution
Factor
1000
10
1
XYZ-1315-T02-A
11/1/20xx
12:00
12:18
1027
725.0
9.15
2.8
NA
Value
2.99
0.21
4.20
PM
PM
g
g
-
mS/c
mv
Units
mg/L
mg/L
mg/L
EPA 9040
EPA 9050
QC
Flag Method
EPA 6020
EPA 6020
U EPA 9056
Date
11/7/20xx
11/7/20xx
11/7/20xx
Dilution
Factor
1000
10
1
QC Flag Key: U Value below lower limit of quantitation as reported (< "LLOQ")
1315-28
Revision 1
December 2009
-------
FIGURES
EXAMPLE INTERVAL CONCENTRATION GRAPHS
Arsenic [ug/L]
100 j
10 -
0 1 -
n n-i
22?
AFSSL-A
OFSSL-B
fi Qfi c
t. L 1 1
Cadmium [pg/L]
a)
O)
1
I
1
0)
(/5
20 40 60 80
Leaching Time [days]
100 •
10 -
i
^i
01 -
i n-i
^
}
AFSSL-A
o—
OFSSL-B
D
O
2
0
20 40 60
Leaching Time [days]
SO
b)
00 •
-in .
IU
<
11 -
n-i
.
0
t A A
o
0 0 A
— i — i — i — i — i — i — , — ,
AFSSL-A
OFSSL-B
G
DA
£
20 40 60 80
Leaching Time [days]
Vanadium [ug/L]
D
DP -. C
* _t -t O C
^J
D
AFSSL-A
OFSSL-B
O Q
Q
d)
20 40 60
Leaching Time [days]
SO
NOTE: Orange lines represent cumulative release if all eluate extracts were at the quantitation limit
(dashed) and detection limit (solid). Chemical analyses below the detection limit are shown at
1/2 the detection limit value.
1315-29
Revision 1
December 2009
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FIGURE 9
EXAMPLE OF SATURATION CHECK BETWEEN INTERVAL CONCENTRATIONS
AND METHOD 1313 DATA
1 UUUUU
10000 -
1000 -
_1
1 100 -
u
'1 10 -
s
0.1 -
n n-i
n
n
[
%
=bc
uiviemoa iou
AFSSL-A
OFSSL-B
.A
CA
i
& —
L
a)
4 6 8 10 12 14
Eluate pH
100000
10000 -;
17 1000 -i
E
3
_3
Q
03
10
1
0.1
0.01
B
5
3fa
5
u Method 1313
AFSSL-A
OFSSL-B
"U&tL
^
T
c)
4 6 8 10 12 14
Eluate pH
d
2.
E
1
°
IUUU
100 -
10 '
1 -
0.1 -
0.01 -
o
n
n
: D
i
uivieinoa i j \3
AFSSL-A
OFSSL-B
*i
-U-.
^&"
^
A
A
0 2 4 6 8 10 12 14
b)
Eluate pH
100000 •
10000 -
5- 1000 -
— 100 -
1 10 -
re
1 1 -
n 1 -
n n-i
\°n 0
:
D Method 13 1 3 "
AFSSL-A
OFSSL-B
i d? SD
' 1
"
d)
468
Eluate pH
10 12 14
NOTE: Orange lines represent cumulative release if all eluate extracts were at the quantitation limit
(dashed) and detection limit (solid). Chemical analyses below the detection limit are shown at
1/2 the detection limit value.
1315-30
Revision 1
December 2009
-------
FIGURE 10
EXAMPLE INTERVAL FLUX GRAPHS
i.c-uo -
1.E-04 -
"uT
CM
£ 1 p nc; -
05
E
*""" 1 c nc
x I.h-Ob
o 1.E-07 -
•
| 1.E-08 -
A c no -
£)
-
AFSSI
OFSS
1 . b-Uy
0.01 0
^
X-
.-B
.1
$ slope = -1/2
o4i
-
^-•~~
P\_A
1 10 1C
a)
Mean Interval [days]
JT
"Si
E
E
2
_0)
OJ
CO
c)
1 . C-UH
1 c nc
i.b-Uo
1 p nR
l.t-UO
1 F 07 -
1 c no
i.t-uo -
1 C.OQ -
rcr^
-
6
; AFSSL-A
; OFSSL-B
, I
Aslope* -1/2
A,
i
O
s
s«*
--•-
0.01 0.1 1 10 100
Mean Interval [days]
1.E-05
1.E-06 -
1.E-07 -
E
"5>
E
: 1.E-08 -
1.E-09
' OQQ
b)
0.01 0.1 1 10 100
Mean Interval [days]
I.C-UO
1.E-04 -
"
CM
-| 1.E-05 -
IE
E 1 F-n? -
I
| 1.E-08 -
-i p no -
^£ slope = -1/2
-
AFSS
OFSSI
2
-
, , . ,,,,.. , , .,,.,,
0^
-
ANC:;-
d)
0.01 0.1 1 10 100
Mean Interval [days]
NOTE: Orange data represent cumulative release if all eluate extracts were at the quantitation limit
(dashes) and detection limit (solid line).
1315-31
Revision 1
December 2009
-------
FIGURE 11
INTERVAL FLUX AT ELUATE SATURATION
1,000
100 -:
10 -
Equalfluxfor
23-hrintervals
V
Equalfluxfor
7-day intervals
Equalfluxfor 14-day intervals
0.01
0.1
10
100
Mean Flux Time [days]
NOTE: This figure assumes that the concentration in the eluate approaches saturation during the
leaching interval (i.e., the driving force for diffusion approaches zero). When the leaching
solution is saturated, the resulting mass release and interval flux is constant for intervals of
the same duration.
1315-32
Revision 1
December 2009
-------
FIGURE 12
EXAMPLE CUMULATIVE RELEASE GRAPHS
E
"01
£
Q>
OL
O
5
i2
<
w
1UU
10 -
1 '
.1
.01
i nni
AFSS
n F<^
L-A
L-B
i slope =) 1/2
-EC
r^
m
I
r — - -
6 '6
66#
^^
0.01 0.1 1 10 100
Z Leaching Time [days]
o>
CO
0
01
£
v
c/>
s
s 0.01 -
0.001
0.01 0.1 1 10 100
Z Leaching Time [days]
E
^)
£
o
w
05
CJ
O
a:
|
E
•D
to
O
^J
0.001
0.01 -i
b]
0.01 0.1 1 10 100
I Leaching Time [days]
0)
M
rc
re
d)
100 -
10 -
1 -
0.1 -
.01
i nn-i
: AFSSL-A
OFSSL-B
; ^- -"
slope
i
»-"
•
rl/2
•
-r— "
.
>°--a
-~
^
M ^"
.— - ^
0.01 0.1 1 10 100
I Leaching Time [days]
NOTE: Orange data represent cumulative release if all eluate extracts were at the quantitation limit
(dashes) and detection limit (solid line).
1315-33
Revision 1
December 2009
-------
FIGURE 13
DATA REPRESENTATION BY CONSTITUENT (QUAD FORMAT)
LLJ
a)
10 '
9 !
8 '
V -
„
k
2
!!-
2
AFSSL-A
OFSSL-B
IUUUUU •
10000 -
„ 1000 -
1 100 -
0
§ *"
01 .
n n-i
: n-i
. ^ D
uMetnoa i.no
AFSSL-A
OFSSL-B
.
^bod^Si
-------
APPENDIX D
METHOD 1316
LIQUID-SOLID PARTITIONING AS A FUNCTION OF
LIQUID-TO-SOLID RATIO IN SOLID MATERIALS
USING A PARALLEL BATCH PROCEDURE
-------
PRELIMINARY VERSION1 OF METHOD 1316
LIQUID-SOLID PARTITIONING AS A FUNCTION OF LIQUID-TO-SOLID RATIO IN SOLID
MATERIALS USING A PARALLEL BATCH PROCEDURE
SW-846 is not intended to be an analytical training manual. Therefore, method
procedures are written based on the assumption that they will be performed by analysts who are
formally trained in at least the basic principles of chemical analysis and in the use of the subject
technology.
In addition, SW-846 methods, with the exception of required method use for the analysis
of method-defined parameters, are intended to be guidance methods which contain general
information on how to perform an analytical procedure or technique which a laboratory can use
as a basic starting point for generating its own detailed Standard Operating Procedure (SOP),
either for its own general use or for a specific project application. The performance data
included in this method are for guidance purposes only, and are not intended to be and must not
be used as absolute QC acceptance criteria for purposes of laboratory accreditation.
1.0 SCOPE AND APPLICATION
1.1 This method is designed to provide the liquid-solid partitioning (LSP) of
inorganic constituents (e.g., metals, radionuclides) and non-volatile organic constituents (e.g.,
polycyclic aromatic hydrocarbons (PAHs), dissolved organic carbon) at the natural pH of the
solid material as a function of liquid-to-solid ratio (L/S) under conditions that approach liquid-
solid chemical equilibrium. Table 1 shows the range of target L/S values tested under this
method.
1.2 The eluate concentrations at a low L/S provide insight into pore solution
composition either in a granular bed (e.g., soil column) or in the pore space of low-permeability
material (e.g., solidified monolithic or compacted granular fill). In addition, analysis of eluates
for dissolved organic carbon and of the solid phase for total organic carbon allow for evaluation
of the impact of organic carbon release and the influence of dissolved organic carbon on the
LSP of inorganic constituents.
1.3 This method is intended to be used as part of environmental leaching
assessment for the evaluation of disposal, beneficial use, treatment effectiveness and site
remediation.
1.4 This method is suitable to a wide range of solid materials. Example solid
materials include industrial wastes, soils, sludges, combustion residues, sediments, stabilized
materials, construction materials, and mining wastes.
Preliminary Version denotes that this method has not been endorsed by EPA but is under consideration
for inclusion into SW-846. This method has been derived from published procedures (Kosson et al, 2002)
using reviewed and accepted methodologies (USEPA 2006, 2008, 2009). The method has been
submitted to the USEPA Office of Resource Conservation and Recovery and is currently under review for
development of interlaboratory validation studies to develop precision and bias information.
1316 - 1 Revision 1.1
April 2010
-------
1.5 This method is a leaching characterization method used to provide intrinsic
material parameters that control leaching of inorganic species under equilibrium conditions.
This test method is intended as a means for obtaining an extract (i.e., the eluate) of a solid
material which may be used to estimate the solubility and release of inorganic constituents
under the laboratory conditions described in this method. Extract concentrations may be used
in conjunction with information regarding environmental management scenarios to estimate
anticipated leaching concentrations, release rate and extent for individual material constituents
in the management scenarios evaluated. Extract concentrations may also be used along with
geochemical speciation modeling to infer the mineral phases that control the LSP in the pore
structure of the solid material.
1.6 This method is not applicable to characterize the release of volatile organic
analytes.
1.7 This method provides solutions that are considered to be indicative of eluate
under field conditions only where the field leaching pH and L/S is the same as the laboratory
extract final conditions and the LSP is controlled by aqueous-phase saturation of the constituent
of interest.
1.8 The solvent used in this method is reagent water
1.9 Analysts are advised to take reasonable measures to ensure that the sample is
homogenized to the extent practical prior to employment of this method. Particle-size reduction
may provide additional assurance of sample homogenization. Table 2 designates a minimum
dry equivalent mass of sample to be added to each extraction vessel and the associated
extraction contact time as a function maximum particle diameter. If the heterogeneity of the
sample is suspected as the cause of unacceptable levels of precision in replicate test results or
is considered significant based on professional judgment, the sample mass used in the test
procedure may be increased to a greater minimum dry equivalent mass than shown in Table 1
with the amount of extractant increased proportionately to maintain the designated L/S.
1.10 In the preparation of solid materials for use in this method, particle-size
reduction of samples with large grain size is used to enhance the approach towards liquid-solid
equilibrium under the designated contact time interval of the extract process. The extract
contact time for samples reduced to a finer maximum particle size will be shorter.
1.11 Prior to employing this method, analysts are advised to consult the base
method for each type of procedure that may be employed in the overall analysis (e.g., Methods
9040, 9045), quality control (QC) acceptance criteria, calculations, and general guidance.
Analysts also should consult the disclaimer statement at the front of the manual and the
information in Chapter Two for guidance on the intended flexibility in the choice of methods,
apparatus, materials, reagents, and supplies, and on the responsibilities of the analyst for
demonstrating that the techniques employed are appropriate for the analytes of interest, in the
matrix of interest, and at the levels of concern.
In addition, analysts and data users are advised that, except where explicitly specified in
a regulation, the use of SW-846 methods is not mandatory in response to Federal testing
requirements. The information contained in this method is provided by EPA as guidance to be
used by the analyst and the regulated community in making judgments necessary to generate
results that meet the data quality objectives for the intended application.
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1.12 Use of this method is restricted to use by, or under supervision of, properly
experienced and trained personnel. Each analyst must demonstrate the ability to generate
acceptable results with this method.
2.0 SUMMARY OF METHOD
This method consists of five parallel extractions of a particle-size reduced solid material
in reagent water over a range of L/S values from 0.5 to 10 mL eluant/g dry material (see Table
1). In addition to the five test extractions, a method blank without solid sample is carried
through the procedure in order to verify that analyte interferences are not introduced as a
consequence of reagent impurities or equipment contamination (If multiple materials or replicate
tests are carried out in parallel, only one set of method blanks is necessary). In total, six bottles
(i.e., five test positions and one method blank) are tumbled in an end-over-end fashion for a
specified contact time based on the maximum particle size of the solid (see Table 2). At the end
of the contact interval, the liquid and solid phases are roughly separated via settling or
centrifugation. Extract pH and specific conductance measurements are then taken on an
aliquot of the liquid phase. The bulk of the eluate is clarified by pressure or vacuum filtration in
preparation for constituent analysis. Analytical aliquots of the extracts are collected and
preserved accordingly based on the determinative methods to be performed. The eluate
constituent concentrations are plotted as a function of L/S and compared to QC and
assessment limits.
3.0 DEFINITIONS
3.1 Release — The dissolution or partitioning of a constituent of potential concern
(COPC) from the solid phase to the aqueous phase during laboratory testing (or under field
conditions). In this method, mass release is expressed in units of mg COPC/kg dry solid
material.
3.2 COPC — A chemical species of interest, which may or may not be regulated,
but may be characteristic of release-controlling properties of the sample geochemistry.
3.3 LSP — The distribution of COPCs between the solid and liquid phases at the
conclusion of the extraction.
3.4 L/S — the fraction of the total liquid volume (including the moisture contained in
the "as used" solid sample) to the dry mass equivalent of the solid material. L/S is typically
expressed in volume units of liquid per dry mass of solid material (mL/g-dry).
3.5 "As-tested" sample — The solid sample at the conditions (e.g., moisture content
and particle-size distribution) present at the time of the start of the test procedure. The "as-
tested" conditions will differ from the "as-received" sample conditions if particle-size reduction
and drying were necessarily performed.
3.6 Dry-mass equivalent — The mass of "as-tested" (i.e., "wet") sample that
equates to the mass of dry solids plus associated moisture, based on the moisture content of
the "as-tested" material. The dry-mass equivalent is typically expressed in mass units of the
"as-tested" sample (g).
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3.7 Refer to the SW-846 chapter of terms and acronyms for potentially applicable
definitions.
4.0 INTERFERENCES
4.1 Solvents, reagents, glassware, and other sample processing hardware may
yield artifacts and/or interferences to sample analysis. All of these materials must be
demonstrated to be free from interferences under the conditions of the analysis by analyzing
method blanks. Specific selection of reagents and purification of solvents by distillation in all-
glass systems may be necessary. Refer to each method to be used for specific guidance on
quality control procedures and to Chapters Three and Four for general guidance on the cleaning
of laboratory apparatus prior to use.
5.0 SAFETY
5.1 This method does not address all safety issues associated with its use. The
laboratory is responsible for maintaining a safe work environment and a current awareness file
of OSHA regulations regarding the safe handling of the chemicals listed in this method. A
reference file of material safety data sheets (MSDSs) should be available to all personnel
involved in these analyses.
6.0 EQUIPMENT AND SUPPLIES
The mention of trade names or commercial products in this manual is for illustrative
purposes only, and does not constitute an EPA endorsement or exclusive recommendation for
use. The products and instrument settings cited in SW-846 methods represent those products
and setting used during the method development or subsequently evaluated by the Agency.
Glassware, reagents, supplies, equipment, and setting other than those listed in this manual
may be employed provided that method performance appropriate for the intended application
has been demonstrated and documented.
This section does not list common laboratory glassware (e.g., beakers and flasks).
6.1 Extraction vessels
6.1.1 Six wide-mouth bottles (i.e., five for test positions plus one for a
method blank) constructed of an inert material resistant to high and low pH conditions or
interaction with the constituents of interest.
6.1.1.1 For the evaluation of inorganic COPC mobility, bottles
composed of high density polyethylene (HOPE) (e.g., Nalgene #3140-0250 or
equivalent), polypropylene (PP), or polyvinyl chloride (PVC) are recommended.
6.1.1.2 For the evaluation of non-volatile organic and mixed
organic/inorganic COPCs, equipment composed of glass or Type 316 stainless
steel is recommended. PTFE is not recommended for non-volatile organics,
due sorption of species with high hydrophobicity (e.g., PAHs). Borosilicate
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glass is recommended over other types of glass, especially when inorganic
analytes are of concern.
6.1.2. The extraction vessels must be of sufficient volume to
accommodate both the solid sample and an extractant volume based on the schedule of
L/S values shown in Table 1. For example, a 500-mL bottle is recommended when 100
g dry equivalent mass is contacted with 200 ml_ of eluant (see T03 in Table 1).
6.1.3 The vessels must have a leak-proof seals that can sustain end-over-
end tumbling for the duration of the designated contact time.
6.1.4 If centrifugation is anticipated to be beneficial for initial phase
separation, the extraction vessels should be capable of withstanding centrifugation at
4000 ±100 rpm for a minimum of 10 ± 2 min. Alternately, samples may be extracted in
bottles that do not meet this centrifugation specification (e.g., Nalgene l-Chem #311-
0250 or equivalent) and the solid-liquid slurries transferred into appropriate
centrifugation vessels for phase separation as needed.
6.2 Balance — Capable of 0.01-g resolution for masses less than 500 g.
6.3 Rotary tumbler — Capable of rotating the extraction vessels in an end-over-end
fashion at a constant speed of 28 ± 2 rpm (e.g., Analytical Testing, Werrington, PA or
equivalent).
6.4 Filtration apparatus — Pressure or vacuum filtration apparatus composed of
appropriate materials so as to maximize the collection of extracts and minimize loss of the
COPCs (e.g., Nalgene #300-4000 or equivalent) (see Sec. 6.1).
6.5 Filtration membranes — Composed of polypropylene or equivalent material with
an effective pore size of 0.45-um (e.g., Gelman Sciences GH Polypro #66548 from Fisher
Scientific or equivalent).
6.6 pH Meter — Laboratory model with the capability for temperature compensation
(e.g., Accumet 20, Fisher Scientific or equivalent) and a minimum resolution of 0.1 pH units.
6.7 pH combination electrode — Composed of chemically-resistant materials.
6.8 Conductivity meter — Laboratory model (e.g., Accumet 20, Fisher Scientific or
equivalent), with a minimum resolution of 5% of the measured value.
6.9 Conductivity electrodes — Composed of chemically-resistant materials.
6.10 Adjustable-volume pipettor — Oxford Benchmate series or equivalent The
necessary delivery range will depend on the buffering capacity of the solid material and
acid/base strength used in the test.
6.11 Disposable pipettor tips.
6.12 Centrifuge (recommended) — Capable of centrifuging the extraction vessels at
a rate of 4000 ± 100 rpm for 10 ± 2 min.
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7.0 REAGENTS AND STANDARDS
7.1 Reagent-grade chemicals must be used in all tests. Unless otherwise
indicated, it is intended that all reagents conform to the specifications of the Committee on
Analytical Reagents of the American Chemical Society, where such specification are available.
Other grades may be used, provided it is first ascertained that the reagents are of sufficiently
high purity to permit use without lessening the accuracy of the determination. Inorganic
reagents and extracts should be stored in plastic to prevent interaction of constituents from
glass containers.
7.2 Reagent water must be interference free. All references to water in this method
refer to reagent water unless otherwise specified.
7.3 Consult Methods 9040 and 9050 for additional information regarding the
preparation of reagents required for pH and specific conductance measurements.
8.0 SAMPLE COLLECTION, PRESERVATION, AND STORAGE
8.1 See the introductory material to Chapter Three "Inorganic Analytes" and
Chapter Four "Organic Analytes."
8.2 All samples should be collected using an appropriate sampling plan.
8.3 All analytical sample containers should be composed of materials that minimize
interaction with solution COPCs. For further information, see Chapters Three and Four.
8.4 Preservatives should not be added to samples before extraction.
8.5 Samples can be refrigerated, unless refrigeration results in an irreversible
physical change to the sample.
8.6 Analytical samples should be preserved according to the guidance given in the
individual determinative methods for the COPCs.
8.7 Extract holding times should be consistent with the aqueous sample holding
times specified in the determinative methods for the COPCs.
9.0 QUALITY CONTROL
9.1 Refer to Chapter One for guidance on quality assurance (QA) and quality
control (QC) protocols. When inconsistencies exist between QC guidelines, method-specific
QC criteria take precedence over both technique-specific criteria and those criteria given in
Chapter One, and technique-specific QC criteria take precedence over the criteria in Chapter
One. Any effort involving the collection of analytical data should include development of a
structured and systematic planning document, such as a Quality Assurance Project Plan
(QAPP) or a Sampling and Analysis Plan (SAP), which translates project objectives and
specifications into directions for those that will implement the project and assess the results.
Each laboratory should maintain a formal quality assurance program. The laboratory should
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also maintain records to document the quality of the data generated. All data sheets and quality
control data should be maintained for reference or inspection.
9.2 In order to demonstrate the purity of reagents and sample contact surfaces, a
method blank (e.g., a bottle without solid material but with eluant carried through the extraction,
filtration and analytical sample preparation process) should be tested.
9.3 The analysis of extracts should follow appropriate QC procedures, as specified
in the determinative methods for the COPCs. Refer to Chapter One for specific quality control
procedures.
9.4 Solid materials should be tested within one month of receipt unless the project
requires that the "as-received" samples are tested sooner (e.g., the material is part of a time-
dependent study or the material may change during storage due to oxidation or carbonation).
10.0 CALIBRATION AND STANDARDIZATION
10.1 The balance should be calibrated and certified at a minimum annually or in
accordance with laboratory policy.
10.2 Prior to measurement of eluate pH, the pH meter should be calibrated using a
minimum of two standards that bracket the range of pH measurements. Refer to Methods 9040
and 9045 for additional guidance.
10.3 Prior to measurement of eluate conductivity, the meter should be calibrated
using at least one standard at a value greater than the range of conductivity measurements.
Refer to Method 9050 for additional guidance.
11.0 PREPARATORY PROCEDURES
A flowchart of the method is presented in Figure 1.
11.1 Particle-size reduction (if required)
11.1.1 In this method, particle-size reduction is used to prepare large-
grained samples for extraction so that the approach toward liquid-solid equilibrium is
enhanced and mass transport through large particles is minimized. A longer extract
contact time is required for larger maximum particle-size designations. This method
designates three maximum particle sizes and associated contact times (see Table 2).
The selection of an appropriate maximum particle size from this table should be based
on professional judgment regarding the practical effort required to size reduce the solid
material.
11.1.2 Particle-size reduction of "as received" sample may be achieved
through crushing, milling or grinding with equipment made from chemically inert
materials. During the reduction process, care should be taken to minimize loss of
sample and potentially volatile constituents in the sample.
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11.1.3 If the moisture content of the "as-received" material is greater than
15% (wet basis), air drying or desiccation may be necessary. Oven drying is not
recommended for preparation of test samples due to the potential for mineral alteration.
In all cases, the moisture content of the "as received" material should be recorded.
NOTE: If the solid material is susceptible to interaction with the atmosphere (e.g.,
carbonation, oxidation), drying should be conducted in an inert environment.
11.1.4 When the material seems to be of a relatively uniform particle size,
calculate the percentage less than the sieve size as follows:
% Passing = Msieved x 100%
Mtotal
Where: Msieved = mass of sample passing the sieve (g)
Mtotai = mass of total sample (g) (e.g., Msieved + mass not passing sieve)
11.1.5 The fraction retained by the sieve should be recycled for further
particle-size reduction until at least 85% of the initial mass has been reduced below the
designated maximum particle size. Calculate and record the final percentage passing
the sieve and the designated maximum particle size. For the uncrushable fraction of the
"as received" material, record the fraction mass and nature (e.g., rock, metal or glass
shards, etc).
11.1.6 Store the size-reduced material in an airtight container in order to
prevent contamination via gas exchange with the atmosphere. Store the container in a
cool, dark and dry place prior to use.
11.2 Determination of solids and moisture content
11.2.1 In order to provide the dry mass equivalent of the "as-tested"
material, the solids content of the subject material should be determined. Often, the
moisture content of the solid sample is recorded. In this method, the moisture content is
determined and recorded on the basis of the "wet" or "as-tested" sample.
WARNING: The drying oven should be contained in a hood or otherwise properly
ventilated. Significant laboratory contamination or inhalation hazards may
result when drying heavily contaminated samples. Consult the laboratory
safety officer for proper handling procedures prior to drying samples that
may contain volatile, hazardous, flammable or explosive materials.
11.2.2 Place a 5-10-g sample of solid material into a pre-tared dish or
crucible. Dry the sample to a constant mass at 105 ± 2 °C. Periodically check the
sample mass after allowing the sample to cool to room temperature
(20 ± 2 °C) in a desiccator.
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NOTE: The oven-dried sample is not used for the extraction and should be properly
disposed of once the dry mass is determined.
11.2.3 Calculate and report the solids content as follows:
Mlest
Where: SC = solids content (g-dry/g)
Mdry = mass of oven-dried sample (g-dry)
Mtest = mass of "as-tested" sample (g)
1 1 .2.4 Calculate and report the moisture content (wet basis) as follows:
Mtest - Md
- r. -
Mtesl
Where: MC(wet) = moisture content on a wet basis (gH o/g)
Mdry = mass of oven-dried sample (g-dry)
Mtest = mass of "as-tested" sample (g)
11.3 Extraction setup schedule (Microsoft® Excel template provided)
This method provides an Excel template which may be used to set up the
extraction schedule. If using the provided template, disregard Sec. 11.3 and proceed to
the extraction procedure Sec. 11.4.
11.3.1 Using the schedule shown in Table 1 as a guide, set up five test
extractions and one method blank. The mass of solids in an extraction may be scaled to
minimize headspace in each extraction vessel. However, the volume of eluant should
always be based on the target L/S in Column B of Table 1.
11.3.2 Calculate and record the amount of "as-tested" material equivalent
to the dry mass in Column D of Table 1 as follows:
Mtest=~sc~
Where: Mtest = mass of "as-tested" solid equivalent to the dry-material mass (g)
Mdry = mass of dry material specified in the method (g-dry)
SC = solids content of "as-tested" material (g-dry/g)
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11.3.3 Calculate and record the volume of moisture contained in the "as-
tested" sample in Column E of Table 1 as follows:
"w.sample
Mtestx(l-SC)
Pw
Where: VWsampie = volume of water in the "as tested" sample (ml)
Mtest = mass of the "as tested" sample (g)
SC = solids content of the "as tested" sample (g-dry/g)
pw = density of water (1.0 g/mL at room temperature)
11.3.4 Calculate and record the volume of reagent water required to bring
each extraction to the target L/S in Column F of Table 1 as follows:
VRW = Mdry x LS - VW|Sample
Where: VRW = volume of reagent water required to complete L/S (ml)
Mdry = dry mass equivalent of solid sample (g)
LS = liquid-to-dry-solid ratio (10 mL/g)
Vw.sampie = volume of water in "as used" sample (ml)
The size of the extraction bottle should be sufficient to contain the combined
volume of solid material and eluant, ideally with a minimum amount of headspace.
12.0 EXTRACTION PROCEDURE
12.1 Label five bottles with test position numbers and an additional bottle as a
method blank according to Column A in Table 1.
12.2 Place the dry-mass equivalent (± 0.1 g) of "as-tested" sample as shown in
Column D in Table 1 into each of the five test position extraction vessels.
NOTE: Do not put solid material in the method blank extraction vessel
12.3 Add the appropriate volume ( ± 0.5 mL) of reagent water to both the test
position and method blank extraction vessels as specified in Column F of Table 1.
12.4 Tighten the leak-proof lid on each bottle and tumble all extractions (i.e., test
positions and method blanks) in an end-over-end fashion at a speed of 28 ± 2 rpm at room
temperature (20 ± 2 °C). The contact time for this method will vary depending on the maximum
particle size as shown in Table 2.
NOTE: The length of the contact time is designed to enhance the approach toward liquid-solid
equilibrium. Longer contact times are required for larger particles to compensate for the
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effects of intra-particle diffusion. See Table 2 for required contact times based on the
maximum particle size.
12.5 Remove the extraction vessels from the rotary tumbler and clarify the
extractants by allowing the bottles to stand for 15 ± 5 min. Alternately, centrifuge the extraction
vessels at 4000 ± 100 rpm for 10 ± 2 min.
NOTE: If clarification is significantly incomplete after settling or centrifugation, eluate
measurements for pH, conductivity, and oxidization-reduction potential (ORP) may be
taken on filtered samples. In this case, perform the filtration in 12.7 prior to eluate
measurement in 12.6 and note the deviation from the written procedure.
CAUTION: Following separation from the solid phase, eluate samples lack the buffering
provided by the solid phase and therefore may be susceptible to pH change
resulting from interaction with air.
12.6 For each extraction vessel, decant a minimum volume (~ 5 ml_) of clear,
unpreserved supernatant into a clean container. Measure and record the pH, specific
conductivity, and oxidation-reduction potential (ORP) (optional, but strongly recommended) of
the extracts (see Methods 9040, 9045, and 9050).
12.7 Separate the solid from the remaining liquid in each extraction vessel by
pressure or vacuum filtration through a clean 0.45-um pore size membrane (Sec. 6.5). The
filtration apparatus may be exchanged for a clean apparatus as often as necessary until all
liquid has been filtered.
NOTE: Eluate measurements for pH, conductivity, and ORP should be taken as soon as
possible after the settling and preferably within 1 hour after completion of tumbling
(12.6).
12.8 Immediately, preserve and store the volume(s) of eluate required for chemical
analysis. Preserve all analytical samples in a manner that is consistent with the determinative
chemical analyses to be performed.
13.0 DATA ANALYSIS AND CALCULATIONS (EXCEL TEMPLATE PROVIDED)
13.1 Data reporting
13.1.1 Figure 2 shows an example of a data sheet that may be used to
report the concentration results of this method. This example is included in the Excel
template. At a minimum, the basic test report should include:
a) Name of the laboratory
b) Laboratory contact information
c) Date at the start of the test
d) Name or code of the solid material
e) Particle size (85 wt% less than)
f) Ambient temperature during extraction (°C)
g) Extraction contact time (h)
h) Eluate specific information (see Sec. 13.1.2 below)
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13.1.2 The minimum set of data that should be reported for each eluate
includes:
a) Eluate sample ID
b) Target L/S (mL/g-dry)
c) Mass of "as tested" solid material used (g)
d) Moisture content of material used (gH2o/g)
e) Volume of eluant used (ml_)
f) Measured final eluate pH
g) Measured eluate conductivity (mS/cm)
h) Measured ORP (mV) (optional)
i) Concentrations of all COPCs
j) Analytical QC qualifiers as appropriate
13.2 Data interpretation and presentation (optional)
13.2.1 LSP curve
13.2.1.1 A constituent LSP curve can be generated for each
COPC after chemical analysis of all extracts by plotting the constituent
concentration in the liquid phase as a function of L/S used for each extraction.
The curve indicates the equilibrium concentration of the COPC as a function of
L/S at the natural pH.
13.2.1.2 The lower limit of quantitation (LLOQ) for the analytical
technique for each COPC may be shown as a horizontal line. COPC
concentrations below this line indicate negligible or non-quantitative
concentrations.
NOTE: The LLOQ is highly matrix dependent and should be determined as
part of a QA/QC plan.
13.2.1.3 Figure 3 provides example LSP curves as a function of
L/S for a coal combustion fly ash and a coal combustion flue gas desulfurization
filter cake.
14.0 METHOD PERFORMANCE
14.1 Performance data and related information are provided in SW-846 methods
only as examples and guidance. The data do not represent required performance criteria for
users of the methods. Instead, performance criteria should be developed on a project-specific
basis, and the laboratory should establish in-house QC performance criteria for the application
of this method. These performance data are not intended to be and must not be used as
absolute QC acceptance criteria for purposes of laboratory accreditation.
14.2 Refs. 1 and 2 may provide additional guidance and insight on the use,
performance and application of this method.
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15.0
POLLUTION PREVENTION
15.1 Pollution prevention encompasses any technique that reduces or eliminates the
quantity and/or toxicity of waste at the point of generation. Numerous opportunities for pollution
prevention exist in laboratory operations. The EPA has established a preferred hierarchy of
environmental management techniques that places pollution prevention as the management
option of first choice. Whenever feasible, laboratory personnel should use pollution prevention
techniques to address their waste generation. When wastes cannot be feasibly reduced at the
source, the Agency recommends recycling as the next best option.
15.2 For information about pollution prevention that may be applicable to
laboratories and research institutions consult Less is Better: Laboratory Chemical Management
for Waste Reduction available from the American Chemical Society's Department of
Government Relations and Science Policy, 1155 16th St., N.W. Washington, D.C. 20036,
http://www.acs.org.
16.0 WASTE MANAGEMENT
The Environmental Protection Agency requires that laboratory waste management
practices be conducted consistent with all applicable rules and regulations. The Agency urges
laboratories to protect the air, water, and land by minimizing and controlling all releases from
hoods and bench operations, complying with the letter and spirit of any sewer discharge permits
and regulations, and by complying with all solid and hazardous waste regulations, particularly
the hazardous waste identification rules and land disposal restrictions. For further information
on waste management, consult The Waste Management Manual for Laboratory Personnel
available from the American Chemical Society at the address listed in Sec. 15.2.
17.0 REFERENCES
1. D.S. Kosson, H.A. van der Sloot, F. Sanchez and A.C. Garrabrants (2002) "An
Integrated Framework for Evaluating Leaching in Waste Management and Utilization of
Secondary Materials," Environmental Engineering Science, 19(3) 159-204.
2. D.S. Kosson, A.C. Garrabrants, H.A. van der Sloot (2009) "Background Information for
the Development of Leaching Test Draft Methods 1313 through Method 1316," (in
preparation).
3. USEPA (2006) Characterization of Mercury-Enriched Coal Combustion Residues from
Electric Utilities Using Enhanced Sorbents for Mercury Control, EPA-600/R-06/008,
February 2006.
4. USEPA (2008) Characterization of Coal Combustion Residues from Electric Utilities
Using Wet Scrubbers for Multi-Pollutant Control, EPA-600/R-08/077, July 2008.
5. USEPA (2009) Characterization of Coal Combustion Residues from Electric Utilities -
Leaching and Characterization Data, EPA-600/R-09/151, December 2009.
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18.0 TABLES, DIAGRAMS, FLOWCHARTS, AND VALIDATION DATA
The following pages contain the tables and figures referenced by this method
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TABLE 1
EXAMPLE SCHEDULE FOR EXTRACTION SETUP
A
Test
Position
T01
T02
T03
T04
T05
603
Total
B
Target
LS
10.0
5.0
2.0
1.0
0.5
QC
C
Minimum Dry
Mass
(g-dry)
20
40
100
200
400
-
-
D
Mass of
"As-Tested"
Sample
(g)
22.2
44.4
111.1
222.2
444.4
844.4
E
Moisture in
"As-Tested"
Sample
(mL)
2.2
4.4
11.1
22.2
44.4
F
Volume of
Reagent
Water
(mL)
198
196
189
178
156
200
1120
G
Recommended
Bottle Size
(mL)
250
250
500
500
1000
250
NOTE: 1) This schedule assumes a target liquid volume of 200 mL.
2) This schedule is based on "as tested" solids content of 0.90 g-dry/g.
3) Test position marked B01 is a method blank of reagent water.
Table data modified from Ref. 1.
TABLE 2
EXTRACTION PARAMETERS AS FUNCTION OF MAXIMUM PARTICLE SIZE
Particle Size
(85% less than)
(mm)
0.3
2.0
5.0
US Sieve
Size
50
10
4
Minimum
Dry Mass
(g-dry)
20 ± 0.05
40 ±0.1
80 ±0.1
Contact Time
(h)
24 ±2
48 ±2
72 ±2
Recommended
Vessel size
(mL)
250
500
1000
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FIGURE 1
METHOD FLOWCHART
< Material of
Interest ^S
Is mate rial at
appropriate
particle size?
yes
no
Particle Size Reduction
(Section 11.1)
Solids/Moisture Content
(Section 11.2)
LS Ratio Schedule
(Section 11.3)
Extraction Procedure
(Section 12)
Extraction Setup
Leachate pH, EC, Eh
Sample Preservation
Extract Analysis
Documentation and
Graphing
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FIGURE 2
EXAMPLE DATA REPORTING SHEET
ABC Laboratories
123 Main Street
Anytown, USA
Contact: John Smith
(555) 111-1111
EPA METHOD 1316
Report of Analysis
Client Contact: Susan Jones
(555) 222-2222
Material Code: FAX
Material Type: Coal Combustion Fly Ash
Date Received : 1 0/1 /20xx
Test Start Date: 11/1/20xx
Report Date: 12/1/20xx
Test
Position
T01
Test
Position
T02
Replicate
A
Eluate Sample ID
Solid Material
Moisture Content
Water Added
Target L/S
Eluate pH
Eluate Conductivity
Eluate ORP
Chemical Analysis
Al
As
Cl
Replicate
A
Eluate Sample ID
Solid Material
Moisture Content
Water Added
Target L/S
Eluate pH
Eluate Conductivity
Eluate ORP
Chemical Analysis
Al
As
Cl
QC Flag Key: U
Value Units
XYZ-1316-T01-A
40.0 g
0.01 gH2o/g
386.0 mL
10.0 mL/g-dry
1.89
12.6 mS/cm
203 mv
Value Units
216.0 mg/L
7.64 mg/L
<4.13 mg/L
Value Units
XYZ-1316-T02-A
20.0 g
0.01 gH2o/g
400.0 mL
5.0 mL/g-
3.86
0.99 mS/cm
180 mv
Value Units
449.0 mg/L
97.9 mg/L
<4.13 mg/L
Value below lower limit
1316- 17
Particle Size: 88% passing 2-mm sieve
Contact Time: 860 g
Lab Temperature: 21 ± 2 °C
EluantUsed: ASTM Type II Water
Method Note
EPA 9040
EPA 9050
QC Dilution
Flag Method Date Factor
EPA 6020 11/7/20xx 1000
EPA 6020 11/7/20xx 10
U EPA 9056 11/9/20xx 1
Method Note
EPA 9040
EPA 9050
QC Dilution
Flag Method Date Factor
EPA 6020 11/7/20xx 1000
EPA 6020 11/7/20xx 10
U EPA 9056 11/7/20xx 1
of quantitation as reported (< "LLOQ")
Revision 1.1
April 2010
-------
1316-18 Revision 1.1
April 2010
-------
FIGURES
EXAMPLE CONCENTRATON RESULTS FROM A COAL COMBUSTION FLY ASH AND
FLUE-GAS DESULFURIZATION FILTER CAKE
Q.
5 9
UJ
8 •
7 .
•"' *
• FGDFilterCak
• Fly Ash
1 «•
u
< 0.001 •
0.0001 -
• ML
(
~ ~j I
MDL
0.00001 ^ -i 1 • • • f
0 4 6 8 10 0 2 4 6 8 10
a) LS Ratio [mL/g-dry] b) LS Ratio [m\jg^ry]
1UUU
100 -
i 0.1-
o
0 0.01 -
0.001 -
"i •
I
innn -
• FGD Filter Cake
; -Fly Ash
MDL '_.
100 -
| -o-
E
1 °1 "
i 0.01 -
Q.
0 001 -
-. —
si "
1 t
1
<
• FGDFilterCak
• Fly Ash
:
i
0.0001 I • ' ' i i • • ' i • ' • I u.uuui i | ,,.),,. , ,..,
02468 10 02468 10
c) LS Ratio [mL/g-dry] d) LS Ratio [mL/g-dry]
.«™r> mnnnn -~_ •
Thallium [ug/L]
l^_^| "
/•
i
• FGDFilterCak
• Fly Ash
.
._•
1
J
1UUUU
1000 -
. 5"
100 -
1 10-
01 .
n r\* .
!•
- •
.
! ML r
! MDL
• FGDFilterCak
• Fly Ash
,
3
U.U 1 U.U 1
02468 10 02468 10
e) LS Ratio [mL/g-dry] f) LS Ratio [mL/g-dry]
1316-19 Revision 1.1
April 2010
-------
APPENDIX E. DETAILS OF TIME, MATERIALS, AND COST
ESTIMATES BY METHOD
Table E-1. Detailed Labor Time Estimates for Method 1313.
Task
Subtask
Moisture Content
Units per
Test
("as received") 2
Air Drying (1-2 days assumed) 1
Particle-size Analysis/Reduction 1
Sieving
Grinding
Moisture Content
Pre-Test Titration
1
1
("as tested") 2
(2 x 5 extracts) 10
Subtask Task Time
fime [min] [h]
0.5
0.5
1.5
30
60
0.5
2.5
Labeling bottles
Solids-filling, weighing & recording
Liquid-filling, weighing & recording
Acid/base addition
pH measurement & recording
10
10
10
10
10
10
20
20
20
50
Data template management
30
Extraction Procedure (9 extracts + 3 QC)
Labeling bottles
Solids-filling, weighing & recording
Liquid-filling, weighing & recording
Acid/base addition
pH/EC/Eh measurement & recording
Eluate filtration
Sample preservation
Data template management
Clean Up (12 filter holders)
12
12
9
12
11
12
12
24
3
3
12
18
24
22
60
60
24
60
90
6.2
Total Labor Time
11.7
Notes:
1) Particle-size reduction assumes a relatively easy material to reduce (e.g., coal combustion residues,
soils) via mechanical grinder or light hand grinding with mortar and pestle.
2) Pre-test titration step assumes two rounds of five extractions are required to adequately define the
titration curve (10 pre-test extractions in all).
E- 1
-------
Table E-2. Detailed Labor Time Estimates for Method 1314.
Task
Subtask
Units per
Test
Moisture Content ("as received") 2
Air Drying (1-2 days assumed) 1
Particle-size Analysis/Reduction 1
Sieving
1
Grinding 1
Moisture Content ("as tested") 2
Column Setup 1
Column packing, weighing & recording
Eluant preparation
Pump adjustment
Column Test Procedure (9 eluates + I QC)
Checking system & flowrate (daily)
Bottle exchange (9 eluates - 8 changes)
pH/EC/Eh measurement & recording
Eluate filtration
Sample preservation
Data template management (daily)
1
1
1
10
15
8
9
10
20
15
Clean up ( 1 filter holders per exchange) 8
Clean up (column) 1
Subtask
Time [min]
30
60
30
15
60
75
40
30
30
60
75
100
Total Labor Time
Task Time
[h]
0.5
0.5
1.5
0.5
1.8
6.9
1.0
12.7
Notes:
1) Particle-size reduction assumes a relatively easy material to reduce (e.g., coal combustion residues,
soils) via mechanical grinder or light hand grinding with mortar and pestle.
2) Column operation assumes light to moderate daily systems maintenance (e.g., pump adjustment, flow
rate measurement & recording).
E-2
-------
Table E-3. Detailed Labor Time Estimates for Method 1315 (Granular Material).
Task U
Subtask
Moisture Content ("as received")
Air Drying (1-2 days assumed)
Particle-size Analysis/Reduction
Sieving
Grinding
Moisture Content ("as tested")
nits per Subtask Task Time
Test Time [min] [h]
2 0
1 0
1 1
.5
.5
.5
1 30
1 60
2 0
.5
Optimum Moisture/Density ( 5 trials)
Moisture adjustment
Sample packing
Dimension measurement & recording
Mass measurement & recording
5
5
5
5
5
50
80
25
25
3.5
Data template management 1 30
Compacted Granular Sample Preparation 1 1.0
Moisture Content ("as packed") 2
Test Procedure (9 fractions + 9 QC)
Eluant-filling, weighing & recording
Sample exchange, weighing & recording
pH/EC/Eh measurement & recording
Eluate filtration
Sample preservation
Data template management
Clean Up (2 vessels + 2 filter holders)
18
9
9
18
18
10
36
9
18
18
54
36
50
108
180
0.5
7.8
Total Labor Time 15.8
Notes:
1) Particle-size reduction assumes a relatively easy material to reduce (e.g., coal combustion residues,
soils) via mechanical grinder or light hand grinding with mortar and pestle.
2) Monolithic samples are assumed to be provided at an appropriate size such that no cutting or coring is
necessary.
3) In most cases, testing of a monolithic sample would require only "as received" moisture content and
the test procedure steps, totaling approximately 8.5 labor hours.
E-3
-------
Table E-4. Detailed Labor Time Estimates for Method 1316.
Task
Subtask
Units per
Test
Moisture Content ("as received") 2
Air Drying (1-2 days assumed) 1
Particle-size Analysis/Reduction 1
Sieving
Grinding
1
1
Moisture Content ("as tested") 2
Extraction Procedure (5 extracts + 1 QC) 6
Labeling bottles 6
Solids-filling, weighing & recording
Liquid-filling, weighing & recording
pH/EC/Eh measurement & recording
Eluate filtration
Sample preservation
Data template management
5
6
6
6
12
1
Clean Up (12 filter holders) 1
Subtask Task Time
Time [min] [h]
0.5
0.5
30
60
1.5
0.5
3.6
6
12
12
30
30
36
30
60
Total Labor Time 6.6
Notes:
1) Particle-size reduction assumes a relatively easy material to reduce (e.g., coal combustion residues,
soils) via mechanical grinder or light hand grinding with mortar and pestle.
Table E-5. Minimum Solid Material Required for Method 1313.
Method 1313
Number of Solid Samples Sample Mass Mass Required
[g-dry] [g-dry]
Moisture Content (MC)
Pre-Test Titration
Batch Test Extracts
2 analyses x 2 replicates
2 trials x 5 extracts
9 extracts
10
40
40
40
400
360
Mass Required for Method 1313
800
E-4
-------
Table E-6. Minimum Solid Material Required for Method 1314.
Method 1314
MC
Column Test
Number of Solid Samples
2 analyses x 2 replicates
Sample Mass
[g-dry]
10
1 column
Mass Required
[g-dry]
40
660
Mass Required for Method 1314 700
a Mass estimate assumes cylindrical column (5-cm dia. x 30 cm) and packing density of 1.2 g-dry/cm3.
Table E-7. Minimum Solid Material Required for Method 1315.
Method 1313 Number of Solid Samples Sample Mass Mass Required
[g-dry] [g-dry]
MC - monolith
MC - granular
Optimum Density3
Tank Testb
3 analyses x 2 replicates
2 analysis x 2 replicates
5 samples
1 sample
10
10
700
1400
Mass Required for Method 1315 (granular)0
60
20
3500
1400
4960
Mass Required for Method 1315 (monolithic)
1420
a Estimate assumes packing 1A volume of test sample per optimum density trial.
Mass estimate assumes cylindrical sample (10-cm dia. x 10 cm) and packed density of 1.7 g-dry/cm3.
0 Optimum density assessment is conducted only for 1st test.
Table E-8. Minimum Solid Material Required for Method 1316.
Method 1313
Number of Solid Samples
Sample Mass Mass Required
[g-dry] [g-dry]
MC 2 analyses x 2 replicates
Batch Test Extracts 5 extracts @ different LS
LS=10 mL/g-dry
LS=5 mL/g-dry
10
25
50
LS=2 mL/g-dry 125
LS= 1 mL/g-dry 250
LS=0. 5 mL/g-dry 500
40
950
Mass Required for Method 1316
990
E-5
-------
Table E-9. Estimate of Supply Costs for Batch Method 1313
(i)
Item Description
Moisture Content
Aluminum weighing dish, 2.3 fl. oz., Fisherbrand
Granular Material Storage
I-Chem HOPE wide-mouth bottle, 1000 mL
Pre-Test Titration
I-Chem HOPE wide-mouth bottle, 250 mL
Nitric Acid, tracemetal grade, Fisher Chemical
Sodium Hydroxide solution, 2N, Fisher Chemical
BD Falcon 15 mL conical centrifuge tube
Extraction Setup
I-Chem HOPE wide -mouth bottle, 250 mL
Nitric Acid, tracemetal grade, Fisher Chemical
Sodium Hydroxide solution, 2N, Fisher Chemical
Fisher
Scientific
Catalog #
08-732-103
05-719-357
05-719-353
A509-212
SS264-1
14-959-49B
05-719-353
A509-212
SS264-1
Required
for 3
Test
Reps
12
3
10
50 mL
50 mL
10
30
~150mL
~150mL
Unit
Price<2)
$0.57
$5.23
$2.95
$0.05
$0.06
$0.42
$2.95
$0.05
$0.06
Cost for 3
Test Reps
$6.84
$15.69
$29.50
$2.50
$3.00
$4.20
$88.50
$7.50
$9.00
Eluate Processing
BD Falcon 15 mL conical centrifuge tube
GH Poly pro filter, 0.45 -urn pore, Andwin Scientific
I-Chem HOPE wide -mouth bottle, 125 mL
Nitric acid, optima grade, Fisher Chemical
14-959-49B
NC9035907
05-719-351
A467-500
30
30
60(3)
30 mL
$0.42
$2.47
$2.39
$0.75
$12.60
$74.10
$143.40
$22.50
Total Supplies Cost per Test $419.33
Equipment and Durable Items
12-port tumbler, LE-1002,
Polycarbonate filter holder
Environmental Express
, 250 mL, Nalgene
09-732-79
1
$6,880.00
09-740-23A 12(4) $104.52
$6,880.00
$1,254.24
Total Equipment Cost per Test $8,134.24
Notes:
(1) Supply and equipment costs are shown as example costs associated with conducting the method and do not
denote any endorsement by the authors or USEPA of a specific vendor, manufacturer or product.
(2) Prices based on Fisher Scientific online catalog (www.fishersci.com') as of 3/25/10 unless otherwise noted.
(3) Assumes two analytical samples per test position with one preserved using optima nitric acid.
(4) Filtration holders may be soap-water washed, rinsed with 10% nitric acid, and triple reagent water rinsed
between uses. Thirty (30) filter holders are recommended if washing between replicates is not anticipated.
E-6
-------
Table E-10. Estimate of Supply and Equipment Costs for Column Method 1314
(i)
Item Description
Fisher
Scientific
Catalog #
Required
for 3 Test
Reps
Moisture Content
Aluminum weighing dish, 2.3 fl. oz., Fisherbrand 08-732-103
12
Granular Material Storage
I-Chem HOPE wide-mouth bottle, 1000 mL
05-719-357
3
Column Setup
Unit
Price<2)
Cost for
3 Test
Reps
$0.57
$5.23
$6.84
$15.69
PTFE column bed support, 4.8-cm, Kimble-Kontes
TygonR-3603 tubing, 1/16" ID, St. Gobain
Calcium chloride dihydrate, ACS, Fisher Chemical
K420809-2040
14-169-1B
C79-500
6
30ft
1.5g/10L
$6.51
$0.28
$0.05
$39.06
$8.40
$0.50
Eluate Processing
BD Falcon 15 mL conical centrifuge tube
GH Polypro filter, 0.45-(im, Andwin Scientific
I-Chem HOPE wide -mouth bottle, 125 mL
Nitric acid, optima grade, Fisher Chemical
14-959-49B
NC9035907
05-719-351
A467-500
28
28
56(3)
-30 mL
$0.42
$2.47
$2.39
$0.75
$11.76
$69.16
$133.84
$22.50
Total Supplies Cost per Test $307.75
Equipment and Durable Items
Chromaflex column, 4.8-cm ID, Kimble-Kontes
Nalgene filter holder, 250 mL, Thermo Scientific
Manostat "Carter" pump, 12/6, Thermo Scientific
Pump link, pharmed, 0.89 mm, Thermo Scientific
LDPE Carboy, 20 L, Nalgene
Polycarbonate straight-side jar, 250 mL, Nalgene
Polypropylene mason jar, 2000 mL, Nalgene
Polypropylene mason jar, 3000 mL, Nalgene
K420830-3020
09-740-23A
13-875-249
13-875-296
02-961 -60E
11-815-10D
11-825C
11-825D
o
6
28(4)
1
3
1
18
3
3
$318.95
$104.52
$2,818.82
$7.52
$124.83
$3.77
$16.79
$21.58
$956.85
$2,926.56
$2,818.82
$22.56
$124.83
$67.86
$50.37
$64.74
Total Equipment Cost per Test $7,032.59
Notes:
(1) Supply and equipment costs are shown as example costs associated with conducting the method and do not
denote any endorsement by the authors or USEPA of a specific vendor.
(2) Estimates based on Fisher Scientific online catalog (www.fishersci.com') as of 3/25/10 unless otherwise noted.
(3) Assumes two analytical samples per test position with one preserved using optima nitric acid.
(4) Filtration holders may be soap-water washed, rinsed with 10% nitric acid, and triple reagent water rinsed
between uses such that less than 28 holders are required.
E-7
-------
Table E-11. Estimate of Supply and Equipment Costs for Mass Transport Method 1315.
(i)
Item Description Fi
Sch
1 Cat
sher Required Catalog
;ntific for 3 Test Price'2'
alog # Reps
Cost for 3
Test Reps
Moisture Content
Aluminum weighing dish, 2.3 fl. oz., Fisherbrand 08-7
Granular Material Storage (Granular Only)
I-Chem HOPE wide -mouth bottle, 1000 mL 05-7
Optimum Density Analysis (Granular Only)
Concrete cylinder molds, 4" ID x 8" (cut to 3") Is
Sample Preparation (Granular Only)
Concrete cylinder molds, 4" ID x 8" (cut to 3") Is
Eluate Processing
32-103 12 $0.57
19-357~| 3 | $5.23
A(a) ~| 5 |~ $0.98
A(a) 3 $0.98
$6.84
$15.69
$4.90
$2.94
BD Falcon 15 mL conical centrifuge tube
GH Polypro filter disc, 0.45-(im, Andwin Scientific
I-Chem HOPE wide -mouth bottle, 125 mL
Nitric acid, Optima grade, Fisher Chemical
14-959-49B
NC9035907
05-719-351
A467-500
36
36
72
36 mL
$0.42
$2.47
$2.39
$0.75
$15.12
$88.92
$172.08
$27.00
Total Supplies Cost per Test (Granular Material) $333.49
Total Supplies Cost per Test (Monolithic Material) $309.96
Equipment and Durable Items
Compaction rammer (granular)
Polycarbonate straight-side jar, lOOOmL (granular)
LDPE 170 oz container (monolithic), Nalge Nunc
Polycarbonate filter holder, 250 mL, Nalgene
NA(b)
11-815-10F
12-566-113
09-740-23A
1
8
8
$100.00
$8.07
$4.00
$100.00
$64.56
$32.00
36(3) 1 $104.52 $3,762.72
Total Equipment Cost per Test (Granular Material) $2,013.64
Total Equipment Cost per Test (Monolithic Material) $1,897.36
Notes:
(1) Supply and equipment costs are shown as example costs associated with conducting the method and do not
denote any endorsement by the authors or USEPA of a specific vendor.
(2) Estimates based on Fisher Scientific online catalog (www.fishersci.com) as of 3/25/10 unless otherwise noted.
a available as item #004-873 through MA Industries, Peachtree City, GA at www.maind.com.
b available as item #EL24-0963 through ELE International at www.ele.com/usa (cost approximated).
(3) Filtration holders may be soap-water washed, rinsed with 10% nitric acid, and triple reagent water rinsed
between uses such that less than 36 holders are required.
E-8
-------
Table E-12. Estimate of Supply Costs for Batch Method 1316.
(i)
Item Description
Fisher Required
Catalog # for 3 Test
Reps
Catalog
Price'2'
Cost for 3
Test Reps
Moisture Content
Fisherbrand aluminum weighing dish, 2.3 fl. oz.
Granular Material Storage
I-Chem HOPE wide -mouth bottle, 1000 mL
Extraction Setup
08-732-103
05-719-357
12
3
$0.57
$5.23
$6.84
$15.69
I-Chem HOPE wide-mouth bottle, 500 mL
05-719-349
16
$4.24
Eluate Processing
BD Falcon 15 mL conical centrifuge tube
Andwin Scientific GH Polypro filter, 0.45-(im
I-Chem HOPE wide -mouth bottle, 125 mL
Fisher Chemical Nitric acid (optima grade)
14-959-49B
NC9035907
05-719-351
A467-500
16
16
32
-16 mL
$0.42
$2.47
$2.39
$0.75
$6.72
$39.52
$76.48
$12.00
Total Supply Cost per Test
$225.09
Durable Supplies
Environmental Express LE-1002 tumbler, 12 port
Nalgene polycarb filter holder, 250 mL
09-732-79
09-740-23A
1
16(3)
6,880.00
$104.52
$6,880.00
$1,672.32
Total Durables Cost per Test
$8,552.32
Notes:
(1) Supply and equipment costs are shown as example costs associated with conducting the method and do not
denote any endorsement by the authors or USEPA of a specific vendor.
2) Estimates based on Fisher Scientific online catalog (www.fishersci.com) as of 2/01/10 unless otherwise noted.
3) Filtration holders may be soap-water washed, rinsed with 10% nitric acid, and triple reagent water rinsed
between uses such that less that 30 holders are required.
E-9
------- |