&EPA Method 1699: Pesticides in Water,
Soil, Sediment, Biosolids, and
Tissue by HRGC/HRMS
December 2007
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Method 1699 December 2007
U.S. Environmental Protection Agency
Office of Water
Office of Science and Technology
Engineering and Analysis Division (4303T)
1200 Pennsylvania Avenue, NW
Washington, DC 20460
EPA-821-R-08-001
December 2007
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Method 1699 December 2007
Introduction
EPA Method 1699 determines organochlorine, organophosphorus, triazine, and pyrethroid pesticides in
environmental samples by high resolution gas chromatography/high resolution mass spectrometry
(HRGC/HRMS) using isotope dilution and internal standard quantitation techniques. This method has
been developed for use with aqueous, solid, tissue and biosolids matrices.
Disclaimer
This method has been reviewed by the Engineering and Analytical Support Branch of the Engineering
and Analysis Division (EAD) in OST. The method is available for general use, but has not been
published in 40 CFR Part 136. Mention of trade names or commercial products does not constitute
endorsement or recommendation for use.
Contacts
Questions concerning this method or its application should be addressed to:
Brian Englert, Ph.D.
Environmental Scientist
Engineering & Analytical Support Branch
Engineering and Analysis Division (43 OST)
Office of Science and Technology, Office of Water
U.S. Environmental Protection Agency
1200 Pennsylvania Avenue NW
Washington, DC 20460
http://www.epa.gov/waterscience
ostcwamethods@epa.gov
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Method 1699 December 2007
Table of Contents
INTRODUCTION 3
DISCLAIMER 3
1.0 SCOPE AND APPLICATION 5
2.0 SUMMARY OF METHOD 6
3.0 DEFINITIONS AND UNITS OF MEASURE 7
4.0 INTERFERENCES 7
5.0 SAFETY 9
6.0 APPARATUS AND MATERIALS 12
7.0 REAGENTS AND STANDARDS 19
8.0 SAMPLE COLLECTION, PRESERVATION, STORAGE, AND HOLDING TIMES 25
9.0 QUALITY ASSURANCE/QUALITY CONTROL 26
10.0 CALIBRATION 31
11.0 SAMPLE PREPARATION 36
12.0 EXTRACTION AND CONCENTRATION 42
13.0 EXTRACT CLEANUP 51
14.0 HRGC/HRMS ANALYSIS 57
15.0 SYSTEM AND LABORATORY PERFORMANCE 58
16.0 QUALITATIVE DETERMINATION 61
17.0 QUANTITATIVE DETERMINATION 61
18.0 ANALYSIS OF COMPLEX SAMPLES 64
19.0 POLLUTION PREVENTION 65
20.0 WASTE MANAGEMENT 65
21.0 METHOD PERFORMANCE 66
22.0 REFERENCES 66
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Method 1699 December 2007
Method 1699: Pesticides in Water, Soil,
Sediment, Biosolids, and Tissue by HRGC/HRMS
1.0 Scope and Application
1.1 Method 1699 is for determination of selected organochlorine, organo-phosphorus, triazine,
and pyrethroid pesticides in multi-media environmental samples by high resolution gas
chromatography/high resolution mass spectrometry (HRGC/HRMS).
1.2 This Method was developed for use in EPA's Clean Water Act (CWA) programs; other
applications are possible. It is based on existing EPA methods (Reference 1) and
procedures developed at Axys Analytical Services (Reference 2).
1.3 The analytes that may be measured by this method and their corresponding Chemical
Abstracts Service Registry Numbers (CASRNs) and ambient water quality criteria are listed
in Table 1.
1.4 The detection limits and quantitation levels in this Method are usually dependent on the
level of interferences rather than instrumental limitations. The method detection limits
(MDLs; 40 CFR 136, appendix B) and minimum levels of quantitation (MLs; 68 FR
11790) in Table 1 are the levels at which pesticides can be determined in the absence of
interferences.
1.5 This Method is restricted for use by analysts experienced in HRGC/HRMS or under the
close supervision of such qualified persons. Each laboratory that uses this Method must
demonstrate the ability to generate acceptable results using the procedure in Section 9.2.
1.6 This method is performance-based which means that you may modify the method to improve
performance (e.g., to overcome interferences or improve the accuracy or precision of the
results) provided that you meet all performance requirements in this method. These
requirements for establishing equivalency of a modification are in Section 9.1.2. For Clean
Water Act (CWA) uses, additional flexibility is described at 40 CFR 136.6. Modifications
not in the scope of Part 136.6 or in Section 9 of this method may require prior review and
approval.
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Method 1699 December 2007
2.0 Summary of Method
Flow charts that summarize procedures for sample preparation, extraction, and analysis are given
in Figure 1 for aqueous and solid samples, Figure 2 for multi-phase samples, and Figure 3 for
tissue samples.
2.1 Extraction (Section 12)
2.1.1 Aqueous samples (samples containing less than one percent solids) - Stable
isotopically labeled analogs of the pesticides are spiked into a 1-L sample. The
sample is extracted at neutral pH with methylene chloride using separatory funnel
extraction (SFE) or continuous liquid/liquid extraction (CLLE).
2.1.2 Solid, semi-solid, and multi-phase samples (excluding municipal sludge and tissue)
- The labeled compounds are spiked into a sample containing 10 g (dry weight) of
solids. Samples containing multiple phases are pressure filtered and any aqueous
liquid is discarded. Coarse solids are ground or homogenized. Any non-aqueous
liquid from multi-phase samples is combined with the solids and extracted with
methylene chloride, methylene chloride :hexane (1:1) or acetone :hexane (1:1) in a
Soxhlet extractor or with toluene in a Soxhlet/Dean-Stark (SDS) extractor
(Reference 3).
2.1.3 Municipal sludges are homogenized, spiked with labeled compounds, and Soxhlet
extracted with dichloromethane.
2.1.4 Fish and other tissue - A 20-g aliquot of sample is homogenized, and a 10-g
aliquot is spiked with the labeled compounds. The sample is mixed with
anhydrous sodium sulfate, allowed to dry for 30 minutes minimum, and extracted
for 18 - 24 hours using methylene chloride in a Soxhlet extractor. The extract is
evaporated to dryness, and the lipid content is determined.
2.2 Concentration (Section 12)
2.2.1 Extracts are macro-concentrated using rotary evaporation, a heating mantle, or a
Kuderna-Danish evaporator.
2.2.2 Extracts to be injected into the HRGC/HRMS are concentrated to a final volume of
20 |oL using nitrogen evaporation (blowdown).
2.3 Cleanup (Section 13)
2.3.1 Extracts of aqueous, solid or mixed phase samples are cleaned up using an
aminopropyl SPE column followed by a microsilica column.
2.3.2 Extracts may be further cleaned up using gel permeation chromatography (GPC) or
solid-phase cartridge techniques.
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Method 1699 December 2007
2.3.3 Extracts in which the organo-chlorine pesticides only are to be determined may be
further cleaned up using silica gel, Florisil, or alumina chromatography.
2.4 Determination by GC/HRMS - Immediately prior to injection, a labeled injection internal
standard is added to each extract and an aliquot of the extract is injected into the gas
chromatograph (GC). The analytes are separated by the GC and detected by a high-resolu-
tion (>8,000) mass spectrometer. Two exact m/z's for each pesticide are monitored
throughout a pre-determined retention time window.
2.5 An individual pesticide is identified by comparing the GC retention time and ion-
abundance ratio of two exact m/z's with the corresponding retention time of an authentic
standard and the theoretical or acquired ion-abundance ratio of the two exact m/z's.
2.6 Quantitative analysis is performed in one of two ways using selected ion current profile
(SICP) areas:
2.6.1 For pesticides for which a labeled analog is available, the GC/HRMS is multi-point
calibrated and the concentration is determined using the isotope dilution technique.
2.6.2 Pesticides for which a labeled analog is not available are determined using the
internal standard technique. The labeled compounds are used as internal standards,
affording recovery correction for all pesticides.
2.7 The quality of the analysis is assured through reproducible calibration and testing of the
extraction, cleanup, and GC/MS systems.
3.0 Definitions and units of measure
Definitions and units of measure are given in the glossary at the end of this Method.
4.0 Interferences
4.1 Solvents, reagents, glassware, and other sample processing hardware may yield artifacts,
elevated baselines, and/or lock-mass suppression causing misinterpretation of
chromatograms. Specific selection of reagents and purification of solvents by distillation in
all-glass systems may be required. Where possible, reagents are cleaned by extraction or
solvent rinse.
4.2 Proper cleaning of glassware is extremely important, because glassware may not only
contaminate the samples but may also remove the analytes of interest by adsorption on the
glass surface.
4.2.1 Glassware should be rinsed with solvent and washed with a detergent solution as
soon after use as is practical. Sonication of glassware containing a detergent
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Method 1699 December 2007
solution for approximately 30 seconds may aid in cleaning. Glassware with
removable parts, particularly separatory runnels with fluoropolymer stopcocks,
must be disassembled prior to detergent washing.
4.2.2 After detergent washing, glassware should be rinsed immediately, first with
methanol, then with hot tap water. The tap water rinse is followed by another
methanol rinse, then acetone, and then methylene chloride.
4.2.3 Baking of glassware in a kiln or other high temperature furnace (300 - 500°C) may
be warranted after particularly dirty samples are encountered. The kiln or furnace
should be vented to prevent laboratory contamination by pesticide vapors. Baking
should be minimized, as repeated baking of glassware may cause active sites on the
glass surface that may irreversibly adsorb pesticides. Volumetric ware should not
be baked at high temperature.
4.2.4 After drying and cooling, glassware should be sealed and stored in a clean
environment to prevent any accumulation of dust or other contaminants. Store
inverted or capped with aluminum foil.
4.2.5 Immediately prior to use, the Soxhlet apparatus should be pre-extracted for
approximately 3 hours and the extraction apparatus should be rinsed with the
extraction solvent.
4.3 All materials used in the analysis must be demonstrated to be free from interferences by
running reference matrix method blanks (Section 9.5) initially and with each sample batch
(samples started through the extraction process on a given 12-hour shift, to a maximum of
20 samples).
4.3.1 The reference matrix must simulate, as closely as possible, the sample matrix under
test. Ideally, the reference matrix should not contain the pesticides in detectable
amounts, but should contain potential interferents in the concentrations expected to
be found in the samples to be analyzed.
4.3.2 When a reference matrix that simulates the sample matrix under test is not
available, reagent water (Section 7.6.1) can be used to simulate water samples;
playground sand (Section 7.6.2) or white quartz sand (Section 7.3.2) can be used to
simulate soils; filter paper (Section 7.6.3) can be used to simulate papers and
similar materials; and corn oil (Section 7.6.4) can be used to simulate tissues.
4.4 Interferences co-extracted from samples will vary considerably from source to source,
depending on the diversity of the site being sampled. Interfering compounds may be
present at concentrations several orders of magnitude higher than the pesticides. The most
frequently encountered interferences are chlorinated biphenyls, chlorinated and brominated
dibenzodioxins and dibenzofurans, methoxy biphenyls, hydroxydiphenyl ethers,
benzylphenyl ethers, brominated diphenyl ethers, polynuclear aromatics, and
polychlorinated naphthalenes. Because very low levels of pesticides are measured by this
Method, elimination of interferences is essential. The cleanup steps given in Section 13
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Method 1699 December 2007
can be used to reduce or eliminate these interferences and thereby permit reliable
determination of the pesticides at the levels shown in Table 1.
4.5 Each piece of reusable glassware should be numbered to associate that glassware with the
processing of a particular sample. This will assist the laboratory in tracking possible
sources of contamination for individual samples, identifying glassware associated with
highly contaminated samples that may require extra cleaning, and determining when
glassware should be discarded.
4.6 Organic acids and other substances make it difficult to extract and clean up biosolids
(sewage sludge) samples. The exact procedures to be used are dependent on the analytes to
be determined. If all analytes in this Method are to be determined, gel permeation
chromatography (GPC), the amino-propyl SPE column, and the layered alumina/Florisil
column have been found effective. For the organo-chlorine pesticides, sequential
extraction with acetonitrile and methylene chloride followed by back extraction with
sodium sulfate-saturated water has been found effective. An anthropogenic isolation
column (Section 13.6; see Section 7.5.2 for column details), GPC (Section 13.2), high
performance liquid chromatography (HPLC; Section 13.5), Florisil (Section 13.7), and
alumina (Section 13.8) are additional steps that may be employed to minimize interferences
in the sludge matrix.
4.7 The natural lipid content of tissue can interfere in the analysis of tissue samples for
measurement of pesticides. The lipid contents of different species and portions of tissue
can vary widely. Lipids are soluble to varying degrees in various organic solvents and may
be present in sufficient quantity to overwhelm the column chromatographic cleanup
procedures used for sample extracts. Lipids must be removed by the anthropogenic
isolation column procedure in Section 13.6, followed by GPC (Section 13.2).
5.0 Safety
5.1 The toxicity or carcinogenicity of each chemical used in this Method has not been precisely
determined; however, each compound should be treated as a potential health hazard.
Exposure to these compounds should be reduced to the lowest possible level.
5.1.1 Some pesticides, most notably 4,4'-DDT and 4,4'-DDD, have been tentatively
classified as known or suspected human or mammalian carcinogens. Pure
standards of the pesticides should be handled only by highly trained personnel
thoroughly familiar with handling and cautionary procedures and the associated
risks.
5.1.2 It is recommended that the laboratory purchase dilute standard solutions of the
analytes in this Method. However, if primary solutions are prepared, they must be
prepared in a hood, and a NIOSH/MESA approved toxic gas respirator must be
worn when high concentrations are handled.
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Method 1699 December 2007
5.2 This Method does not address all safety issues associated with its use. The laboratory is
responsible for maintaining a current awareness file of OSHA regulations regarding the
safe handling of the chemicals specified in this Method. A reference file of material safety
data sheets (MSDSs) should also be made available to all personnel involved in these
analyses. It is also suggested that the laboratory perform personal hygiene monitoring of
each analyst who uses this Method and that the results of this monitoring be made available
to the analyst. Additional information on laboratory safety can be found in References 4-7.
The references and bibliography at the end of Reference 6 are particularly comprehensive
in dealing with the general subject of laboratory safety.
5.3 The pure pesticides and samples suspected to contain high concentrations of these
compounds are handled using essentially the same techniques employed in handling
radioactive or infectious materials. Well-ventilated, controlled access laboratories are
required. Assistance in evaluating the health hazards of particular laboratory conditions
may be obtained from certain consulting laboratories and from State Departments of Health
or Labor, many of which have an industrial health service. Each laboratory must develop a
strict safety program for handling these compounds. The practices in Reference 8 for
handling chlorinated dibenzo-p-dioxins and dibenzofurans (CDDs/CDFs) are also
recommended for handling pesticides.
5.3.1 Facility - When finely divided samples (dusts, soils, dry chemicals) are handled, all
operations (including removal of samples from sample containers, weighing,
transferring, and mixing) should be performed in a glove box demonstrated to be
leak tight or in a fume hood demonstrated to have adequate air flow. Gross losses
to the laboratory ventilation system must not be allowed. Handling of the dilute
solutions normally used in analytical and animal work presents no inhalation
hazards except in the case of an accident.
5.3.2 Protective equipment - Disposable plastic gloves, apron or lab coat, safety glasses
or mask, and a glove box or fume hood adequate for radioactive work should be
used. During analytical operations that may give rise to aerosols or dusts,
personnel should wear respirators equipped with activated carbon filters. Eye
protection (preferably full face shields) must be worn while working with exposed
samples or pure analytical standards. Latex gloves are commonly used to reduce
exposure of the hands. When handling samples suspected or known to contain
high concentrations of the pesticides, an additional set of gloves can also be worn
beneath the latex gloves.
5.3.3 Training - Workers must be trained in the proper method of removing
contaminated gloves and clothing without contacting the exterior surfaces.
5.3.4 Personal hygiene - Hands and forearms should be washed thoroughly after each
operation involving high concentrations of the pesticides, and before breaks
(coffee, lunch, and shift).
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Method 1699 December 2007
5.3.5 Confinement - Isolated work areas posted with signs, segregated glassware and
tools, and plastic absorbent paper on bench tops will aid in confining
contamination.
5.3.6 Effluent vapors - The effluent of the sample splitter from the gas chromatograph
(GC) and from roughing pumps on the mass spectrometer (MS) should pass
through either a column of activated charcoal or be bubbled through a trap contain-
ing oil or high-boiling alcohols to condense pesticide vapors.
5.3.7 Waste handling - Good technique includes minimizing contaminated waste.
Plastic bag liners should be used in waste cans. Janitors and other personnel should
be trained in the safe handling of waste.
5.3.8 Decontamination
5.3.8.1 Decontamination of personnel - Use any mild soap with plenty of
scrubbing action.
5.3.8.2 Glassware, tools, and surfaces - Chlorothene NU Solvent is a less toxic
solvent that should be effective in removing pesticides. Satisfactory
cleaning may be accomplished by rinsing with Chlorothene, then
washing with any detergent and water. If glassware is first rinsed with
solvent, the wash water may be disposed of in the sewer. Given the cost
of disposal, it is prudent to minimize solvent wastes.
5.3.9 Laundry - Clothing known to be contaminated should be collected in plastic bags.
Persons that convey the bags and launder clothing should be advised of the hazard
and trained in proper handling. Clothing may be put into a washer without contact
if the launderer knows of the potential problem. The washer should be run through
a cycle before being used again for other clothing.
5.3.10 Wipe tests - A useful method of determining cleanliness of work surfaces and tools
is to perform a wipe test of the surface suspected of being contaminated.
5.3.10.1 Using a piece of filter paper moistened with Chlorothene or other
solvent, wipe an area approximately 10 x 10 cm.
5.3.10.2 Extract and analyze the wipe by GC with an electron capture detector
(BCD) or by this Method.
5.3.10.3 Using the area wiped (e.g., 10 x 10 cm = 0.01 m2), calculate the
concentration in (ig/m2. A concentration less than 1 (ig/m2 indicates
acceptable cleanliness; anything higher warrants further cleaning. More
than 100 (ig/m2 constitutes an acute hazard and requires prompt cleaning
before further use of the equipment or work space, and indicates that
unacceptable work practices have been employed.
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Method 1699 December 2007
5.4 Biosolids samples may contain high concentrations of biohazards, and must be handled
with gloves and opened in a hood or biological safety cabinet to prevent exposure.
Laboratory staff should know and observe the safety procedures required in a
microbiology laboratory that handles pathogenic organisms when handling biosolids
samples.
6.0 Apparatus and materials
Note: Brand names, suppliers, and part numbers are for illustration purposes only and no
endorsement is implied. Equivalent performance may be achieved using apparatus and materials
other than those specified here. Meeting the performance requirements of this Method is the
responsibility of the laboratory.
6.1 Sampling equipment for discrete or composite sampling
6.1.1 Sample bottles and caps
6.1.1.1 Liquid samples (waters, sludges and similar materials containing 5
percent solids or less) - Sample bottle, amber glass, 1.1-L minimum,
with screw cap.
6.1.1.2 Solid samples (soils, sediments, sludges, paper pulps, filter cake,
compost, and similar materials that contain more than 5 percent solids) -
Sample bottle, wide mouth, amber glass, 500-mL minimum.
6.1.1.3 If amber bottles are not available, samples must be protected from light.
6.1.1.4 Bottle caps - Threaded to fit sample bottles. Caps must be lined with
fluoropolymer.
6.1.1.5 Cleaning
6.1.1.5.1 Bottles are detergent water washed, then solvent rinsed
before use.
6.1.1.5.2 Liners are detergent water washed and rinsed with reagent
water (Section 7.6.1).
6.1.2 Compositing equipment - Automatic or manual compositing system incorporating
glass containers cleaned per bottle cleaning procedure above. Only glass or
fluoropolymer tubing must be used. If the sampler uses a peristaltic pump, a
minimum length of compressible silicone rubber tubing may be used in the pump
only. Before use, the tubing must be thoroughly rinsed with methanol, followed by
repeated rinsing with reagent water to minimize sample contamination. An
integrating flow meter is used to collect proportional composite samples.
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Method 1699 December 2007
6.2 Equipment for glassware cleaning
Note: If blanks from bottles or other glassware or with fewer cleaning steps than required in this
Method show no detectable pesticide contamination, unnecessary cleaning steps and equipment may
be eliminated.
6.2.1 Laboratory sink with overhead fume hood
6.2.2 Kiln - Capable of reaching 450°C within 2 hours and maintaining 450 - 500°C
within V10°C, with temperature controller and safety switch (Cress Manufacturing
Co, Santa Fe Springs, CA, B31H, X3 ITS, or equivalent). See the precautions in
Section 4.2.3.
6.2.3 Aluminum foil - solvent rinsed or baked in a kiln. If baked in a kiln, heavy-duty
aluminum foil is required, as thinner foil will become brittle and unusable.
6.3 Equipment for sample preparation
6.3.1 Laboratory fume hood of sufficient size to contain the sample preparation
equipment listed below.
6.3.2 Glove box (optional)
6.3.3 Tissue homogenizer - VirTis Model 45 Macro homogenizer (American Scientific
Products H-3515, or equivalent) with stainless steel Macro-shaft and Turbo-shear
blade.
6.3.4 Meat grinder - Hobart, or equivalent, with 3- to 5-mm holes in inner plate.
6.3.5 Equipment for determining percent moisture
6.3.5.1 Oven - Capable of maintaining a temperature of 110 V5°C
6.3.5.2 Desiccator
6.3.6 Balances
6.3.6.1 Analytical - Capable of weighing 0.1 mg
6.3.6.2 Top loading - Capable of weighing 10 mg
6.4 Extraction apparatus
6.4.1 Water and solid samples
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Method 1699 December 2007
6.4.1.1 pH meter, with combination glass electrode
6.4.1.2 pH paper, wide range (Hydrion Papers, or equivalent)
6.4.1.3 Graduated cylinder, glass, 1-L capacity and Erlenmeyer Flask, glass, 1-L
capacity
6.4.1.4 Liquid/liquid extraction - Separatory runnels, 250-, 500-, and 2000-mL,
with fluoropolymer stopcocks
6.4.1.5 Solid-phase extraction
6.4.1.5.1 1-L filtration apparatus, including glass funnel, frit support,
clamp, adapter, stopper, filtration flask, and vacuum tubing
(Figure 4). For wastewater samples, the apparatus should
accept 90 or 144 mm disks. For drinking water or other
samples containing low solids, smaller disks may be used.
6.4.1.5.2 Vacuum source - Capable of maintaining 25 in. Hg,
equipped with shutoff valve and vacuum gauge
6.4.1.5.3 Glass-fiber filter - Whatman GMF 150 (or equivalent), 1
micron pore size, to fit filtration apparatus in Section
6.4.1.5.1
6.4.1.5.4 Solid-phase extraction disk containing octadecyl (Ci8)
bonded silica uniformly enmeshed in an inert matrix - Fisher
Scientific 14-378F (or equivalent), to fit filtration apparatus
in Section 6.4.1.5.1
6.4.1.6 Continuous liquid/liquid extraction (CLLE) - Fluoropolymer or glass
connecting joints and stopcocks without lubrication, 1.5-2 L capacity
(Hershberg-Wolf Extractor, Cal-Glass, Costa Mesa, California, 1000 mL
or 2000 mL, or equivalent)
6.4.2 Soxhlet/Dean-Stark (SDS) extractor (Figure 5 and Reference 3) for filters and
solid/sludge samples
6.4.2.1 Soxhlet - 50-mm ID, 200-mL capacity with 500-mL flask (Cal-Glass
LG-6900, or equivalent, except substitute 500-mL round-bottom flask for
300-mL flat-bottom flask)
6.4.2.2 Thimble - 43 H 123 to fit Soxhlet (Cal-Glass LG-6901-122, or
equivalent)
6.4.2.3 Moisture trap - Dean Stark or Barret with fluoropolymer stopcock, to fit
Soxhlet
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Method 1699 December 2007
6.4.2.4 Heating mantle - Hemispherical, to fit 500-mL round-bottom flask (Cal-
Glass LG-8801-112, or equivalent)
6.4.2.5 Variable transformer - Powerstat (or equivalent), 110-volt, 10-amp
6.4.3 Beakers - 400- to 500-mL
6.4.4 Spatulas - Stainless steel
6.5 Filtration apparatus
6.5.1 Pyrex glass wool - Solvent-extracted using a Soxhlet or SDS extractor for 3 hours
minimum
6.5.2 Glass funnel - 125- to 250-mL
6.5.3 Glass-fiber filter paper - Whatman GF/D (or equivalent), to fit glass funnel in
Section 6.5.2.
6.5.4 Drying column - 15- to 20-mm ID Pyrex chromatographic column equipped with
coarse-glass frit or glass-wool plug
6.5.5 Buchner funnel - 15-cm
6.5.6 Glass-fiber filter paper for Buchner funnel above
6.5.7 Filtration flasks - glass, 1.5- to 2.0-L, with side arm
6.5.8 Pressure filtration apparatus - Millipore YT30 142 HW, or equivalent
6.6 Centrifuge apparatus
6.6.1 Centrifuge - Capable of rotating 500-mL centrifuge bottles or 15-mL centrifuge
tubes at 5,000 rpm minimum
6.6.2 Centrifuge bottles - 500-mL, with screw-caps, to fit centrifuge
6.6.3 Centrifuge tubes - 12- to 15-mL, with screw-caps, to fit centrifuge
6.7 Cleanup apparatus
6.7.1 Automated gel permeation chromatograph (Analytical Biochemical Labs, Inc,
Columbia, MO, Model GPC Autoprep 1002, or equivalent)
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Method 1699 December 2007
6.7.1.1 Column - 600-700 mm long H 25 mm ID glass, packed with 70 g of
200-400 mesh SX-3 Bio-beads (Bio-Rad Laboratories, Richmond, CA,
or equivalent)
6.7.1.2 Syringe - 10-mL, with Luer fitting
6.7.1.3 Syringe filter holder - stainless steel, and glass-fiber or fluoropolymer
filters (Gelman 4310, or equivalent)
6.7.1.4 UV detectors - 254-nm, preparative or semi-preparative flow cell (Isco,
Inc., Type 6; Schmadzu, 5-mm path length; Beckman-Altex 152W, 8-|oL
micro-prep flow cell, 2-mm path; Pharmacia UV-1, 3-mm flow cell;
LDC Milton-Roy UV-3, monitor #1203; or equivalent)
6.7.2 Reverse-phase high-performance liquid chromatograph (Reference 9)
6.7.2.1 Pump - Perkin-Elmer Series 410, or equivalent
6.7.2.2 Injector - Perkin-Elmer ISS-100 Autosampler, or equivalent
6.7.2.3 6-Port switching valve - Valco N60, or equivalent
6.7.2.4 Column - Hypercarb, 100 x 4.6 mm, 5 Om particle size, Keystone
Scientific, or equivalent
6.7.2.5 Detector - Altex 110A (or equivalent) operated at 0.02 AUFS at 235 nm
6.7.2.6 Fraction collector - Isco Foxy II, or equivalent
6.7.3 Pipets, precleaned
6.7.3.1 Disposable, Pasteur, 150-mm long x 5-mm ID (Fisher Scientific 13-678-
6A, or equivalent)
6.7.3.2 Disposable, serological, 50-mL (8- to 10- mm ID)
6.7.4 Glass chromatographic columns
6.7.4.1 150-mm long x 8-mm ID, (Kontes K-420155, or equivalent) with coarse-
glass frit or glass-wool plug and 250-mL reservoir
6.7.4.2 200-mm long x 15-mm ID, with coarse-glass frit or glass-wool plug and
250-mL reservoir
6.7.4.3 300-mm long x 22-mm ID, with coarse-glass frit, 300-mL reservoir, and
glass or fluoropolymer stopcock
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Method 1699 December 2007
6.7.5 Oven - For baking and storage of adsorbents, capable of maintaining a constant
temperature (V 5°C) in the range of 105-250°C
6.7.6 System for solid-phase extraction
6.7.6.1 Vac-Elute Manifold (Analytichem International, or equivalent)
6.7.6.2 Vacuum trap: Made from 500-mL sidearm flask fitted with single-hole
rubber stopper and glass tubing
6.7.6.3 Rack for holding 50-mL volumetric flasks in the manifold
6.8 Concentration apparatus
6.8.1 Rotary evaporator - Buchi/Brinkman-American Scientific No. E5045-10 or
equivalent, equipped with a variable temperature water bath
6.8.1.1 Vacuum source for rotary evaporator equipped with vacuum gauge and
with shutoff valve at the evaporator
6.8.1.2 A recirculating water pump and chiller are recommended. Use of tap
water for cooling the evaporator wastes large volumes of water and can
lead to inconsistent performance as water temperatures and pressures
vary.
6.8.1.3 Round-bottom flask - 100-mL and 500-mL or larger, with ground-glass
fitting compatible with the rotary evaporator
6.8.2 Kuderna-Danish (K-D) concentrator
6.8.2.1 Concentrator tube - 10-mL, graduated (Kontes K-570050-1025, or
equivalent) with calibration verified. Ground-glass stopper (size 19/22
joint) is used to prevent evaporation of extracts.
6.8.2.2 Evaporation flask - 500-mL (Kontes K-570001-0500, or equivalent),
attached to concentrator tube with springs (Kontes K-662750-0012 or
equivalent)
6.8.2.3 Snyder column - Three-ball macro (Kontes K-503000-0232, or
equivalent)
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Method 1699 December 2007
6.8.2.4 Boiling chips
6.8.2.4.1 Glass or silicon carbide - Approximately 10/40 mesh,
extracted with methylene chloride and baked at 450°C for
one hour minimum
6.8.2.4.2 Fluoropolymer (optional) - Extracted with methylene
chloride
6.8.2.5 Water bath - Heated, with concentric ring cover, capable of maintaining
a temperature within V 2°C, installed in a fume hood
6.8.3 Nitrogen evaporation apparatus - Equipped with water bath controlled in the range
of 30 - 60°C (N-Evap, Organomation Associates, Inc., South Berlin, MA, or
equivalent), installed in a fume hood
6.8.4 Sample vials
6.8.4.1 Amber glass, 2- to 5-mL with fluoropolymer-lined screw-cap
6.8.4.2 Glass, 0.3-mL, conical, with fluoropolymer-lined screw or crimp cap
6.9 Gas chromatograph - Must have splitless or on-column injection port for capillary column,
temperature program with isothermal hold, and must meet all of the performance
specifications in Section 10.
6.9.1 GC column - 60 V 5-m long x 0.25 V 0.02-mm ID; 0.1 (Hun film DB-17, or
equivalent
6.9.1.1 The column must meet the following minimum retention time and
resolution criteria, and must be adjusted or replaced when these criteria
are not met:
6.9.1.1.1 The retention time for methoxychlor must be greater than 39
minutes.
6.9.1.1.2 trans-chlordane and trans-nonachlor (or the labeled analogs)
must be uniquely resolved to a valley height less than 10
percent of the shorter of the two peaks.
6.9.1.2 Endrin and DDT breakdown - The column must meet the endrin/DDT
breakdown criteria in Section 10.6.2.3. Some GC injectors may be
unable to meet requirements for endrin and DDT breakdown. This
problem can be minimized by operating the injector at 200 - 205 °C,
using a Pyrex (not quartz) methyl silicone deactivated injector liner, and
deactivating the injector with dichlorodimethylsilane. A temperature
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Method 1699 December 2007
programmed injector has also been shown to minimize decomposition of
labile substances such as endrin and DDT (Reference 10).
6.10 Mass spectrometer - 28- to 40-eV electron impact ionization, must be capable of
selectively monitoring a minimum of 22 exact m/z's minimum at high resolution (greater
than 8,000) during a period less than 1.5 seconds, and must meet all of the performance
specifications in Section 10.
6.11 GC/MS interface - The mass spectrometer (MS) must be interfaced to the GC such that the
end of the capillary column terminates within 1 cm of the ion source but does not intercept
the electron or ion beams.
6.12 Data system - Capable of collecting, recording, storing, and processing MS data
6.12.1 Data acquisition - The signal at each exact m/z must be collected repetitively
throughout the monitoring period and stored on a mass storage device.
6.12.2 Response factors and multipoint calibrations - The data system must record and
maintain lists of response factors (response ratios for isotope dilution) and
multipoint calibrations. Computations of relative standard deviation (RSD) are be
used to test calibration linearity. Statistics on initial (Section 9.4) and ongoing
(Section 15.6.4) performance should be computed and maintained, either on the
instrument data system, or on a separate computer system.
7.0 Reagents and standards
7.1 pH adjustment and back-extraction
7.1.1 Potassium hydroxide (KOH) - Dissolve 20 g reagent grade KOH in 100 mL
reagent water.
7.1.2 Sulfuric acid (H2SO4) - Reagent grade (specific gravity 1.84)
7.1.3 Hydrochloric acid - Reagent grade, 6N
7.1.4 Sodium chloride solution - Prepare at 5% (w/v) solution in reagent water
7.1.4 Sodium sulfate solution - Prepare at 2% (w/v) in reagent water; pH adjust to 8.5 -
9.0withKOHorH2SO4
7.2 Solution and tissue drying, municipal sludge extract back-extraction, and solvent
evaporation (blowdown)
7.2.1 Solution drying - Sodium sulfate, reagent grade, granular, anhydrous (Baker 3375,
or equivalent), rinsed with methylene chloride (20 mL/g), baked at 400°C for 1
hour minimum, cooled in a desiccator, and stored in a pre-cleaned glass bottle with
screw-cap that prevents moisture from entering. If, after heating, the sodium
19
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Method 1699 December 2007
sulfate develops a noticeable grayish cast (due to the presence of carbon in the
crystal matrix), that batch of reagent is not suitable for use and should be discarded.
Extraction with methylene chloride (as opposed to simple rinsing) and baking at a
lower temperature may produce sodium sulfate that is suitable for use.
7.2.2 Tissue drying - Sodium sulfate, reagent grade, powdered, treated and stored as in
Section 7.2.1
7.2.3 Solution for back-extraction of municipal sludge extracts - Sodium sulfate
solution: 2% (w/v) in reagent water, pH adjusted to pH 8.5 to 9.0 with KOH or
H2SO4
7.2.4 Prepurified nitrogen
7.3 Extraction
7.3.1 Solvents - Acetone, toluene, cyclohexane, hexane, methanol, methylene chloride,
isooctane, and nonane; distilled in glass, pesticide quality, lot-certified to be free of
interferences
7.3.2 White quartz sand, 60/70 mesh - For Soxhlet/Dean-Stark extraction (Aldrich
Chemical, Cat. No. 27-437-9, or equivalent). Bake at 450 - 500°C for 4 hours
minimum.
7.4 GPC calibration solution - Prepare a solution containing 2.5 mg/mL corn oil, 0.05 mg/mL
bis(2-ethylhexyl) phthalate (BEHP), 0.01 mg/mL methoxychlor, 0.002 mg/mL perylene,
and 0.008 mg/mL sulfur, or at concentrations appropriate to the response of the detector.
7.5 Adsorbents for sample cleanup
7.5.1 Silica gel
7.5.1.1 Activated silica gel - 100-200 mesh, Supelco 1-3651 (or equivalent),
mesh, rinsed with methylene chloride, baked at 180±5 °C for a minimum
of 1 hour, cooled in a desiccator, and stored in a precleaned glass bottle
with screw-cap that prevents moisture from entering.
7.5.1.1.1 10% deactivated silica - Place 100 g of activated silica gel
(Section 7.5.1.1) in a clean glass bottle or jar and add 10 g (ormL) of
reagent water. Cap the bottle tightly to prevent moisture from entering
or escaping.
7.5.1.1.2 Tumble the bottle for 5-10 hours to thoroughly mix the water
and silica. Keep bottle tightly sealed when silica is not being removed
for use.
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Method 1699 December 2007
7.5.1.2 Acid silica gel (30% w/w) - Thoroughly mix 44 g of concentrated
sulfuric acid with 100 g of activated silica gel in a clean container.
Break up aggregates with a stirring rod until a uniform mixture is
obtained. Store in a screw-capped bottle with fluoropolymer-lined cap.
7.5.1.3 Basic silica gel - Thoroughly mix 30 g of IN sodium hydroxide with 100
g of activated silica gel in a clean container. Break up aggregates with a
stirring rod until a uniform mixture is obtained. Store in a screw-capped
bottle with fluoropolymer-lined cap.
7.5.1.4 Potassium silicate
7.5.1.4.1 Dissolve 56 g of high purity potassium hydroxide (Aldrich,
or equivalent) in 300 mL of methanol in a 750- to 1000-mL
flat-bottom flask.
7.5.1.4.2 Add 100 g of activated silica gel (Section 7.5.1.1) and a
stirring bar, and stir on an explosion-proof hot plate at 60-
70°C for 1-2 hours.
7.5.1.4.3 Decant the liquid and rinse the potassium silicate twice with
100-mL portions of methanol, followed by a single rinse
with 100 mL of methylene chloride.
7.5.1.4.4 Spread the potassium silicate on solvent-rinsed aluminum
foil and dry for 2-4 hours in a hood. Observe the precaution
in Section 5.3.2.
7.5.1.4.5 Activate overnight at 200-250°C prior to use.
7.5.2 Anthropogenic isolation column - Pack the column in Section 6.7.4.3 from bottom
to top with the following:
7.5.2.1 2 g silica gel (Section 7.5.1.1)
7.5.2.2 2 g potassium silicate (Section 7.5.1.4)
7.5.2.3 2 g granular anhydrous sodium sulfate (Section 7.2.1)
7.5.2.4 10 g acid silica gel (Section 7.5.1.2)
7.5.2.5 2 g granular anhydrous sodium sulfate
7.5.3 Aminopropyl solid-phase extraction (SPE) column - 1 g aminopropyl-bonded
silica (Varian NH2, or equivalent).
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Method 1699 December 2007
Note: Other SPE columns (e.g., C18 octadecyl, cyanopropyl) may be used provided the laboratory
establishes the elution conditions and meets the requirements in Section 9.2 with the SPE column as
an integral part of the analysis.
7.5.4 Florisil column
7.5.4.1 Florisil - PR grade, 60-100 mesh (U.S. Silica Corp, Berkeley Springs,
WV, or equivalent). Alternatively, prepacked Florisil columns may be
used. Use the following procedure for Florisil activation and column
packing.
7.5.4.2 Fill a clean 1- to 2-L bottle 1/2 to 2/3 full with Florisil and place in an
oven at 130-150°C for a minimum of three days to activate the Florisil.
7.5.4.3 Immediately prior to use, dry pack a 300-mm x 22-mm ID glass column
(Section 6.7.4.3) bottom to top with 0.5-1.0 cm of warm to hot
anhydrous sodium sulfate (Section 7.2.1), 10-10.5 cm of warm to hot
activated Florisil (Section 7.5.4.2), and 1-2 cm of warm to hot anhydrous
sodium sulfate. Allow the column to cool and pre-elute immediately
with 100 mL of n-hexane. Keep column wet with hexane to prevent
water from entering.
7.5.4.4 Using the procedure in Section 13.7.3, establish the elution pattern for
each carton of Florisil or each lot of Florisil columns received.
7.5.5 Alumina column
7.5.5.1 Alumina - Neutral, Brockman Activity I, 80-200 mesh (Fisher Scientific
Certified, or equivalent). Heat for 16 hours at 400 to 450°C. Seal and
cool to room temperature. Add 7% (WAV) reagent water and tumble for
1 to 2 hours. Keep bottle tightly sealed.
7.5.5.2 Immediately prior to use, partially fill a 150-mm x 8-mm ID glass
column (Section 6.7.4.1) with n-hexane. Pack the column bottom to top
with 0.5 - 1 cm of warm to hot anhydrous sodium sulfate (Section 7.2.1),
10 - 10.5 cm alumina (Section 7.5.5.1) and 1 - 1.5 cm of warm to hot
anhydrous sodium sulfate. Allow the column to cool and pre-elute
immediately with 100 mL of hexane. Keep column wet with hexane to
prevent moisture from entering.
7.6 Reference matrices - Matrices in which the pesticides and interfering compounds are not
detected by this Method
7.6.1 Reagent water - Bottled water purchased locally, or prepared by passage through
activated carbon
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Method 1699 December 2007
7.6.2 High-solids reference matrix - Playground sand or similar material. Prepared by
extraction with methylene chloride and/or baking at 450°C for a minimum of 4
hours.
7.6.3 Paper reference matrix - Glass-fiber filter, Gelman type A, or equivalent. Cut
paper to simulate the surface area of the paper sample being tested.
7.6.4 Tissue reference matrix - Corn or other vegetable oil.
7.6.5 Other matrices - This Method may be verified on any reference matrix by
performing the tests given in Section 9.2. Ideally, the matrix should be free of the
pesticides, but in no case must the background level of the pesticides in the
reference matrix exceed the minimum levels in Table 1. If low background levels
of the pesticides are present in the reference matrix, the spike level of the analytes
used in Section 9.2 should be increased to provide a spike-to-background ratio of
approximately 5 (Reference 11).
7.7 Standard solutions - Prepare from materials of known purity and composition or purchase
as solutions or mixtures with certification to their purity, concentration, and authenticity. If
the chemical purity is 98 % or greater, the weight may be used without correction to
calculate the concentration of the standard. Observe the safety precautions in Section 5 and
the recommendation in Section 5.1.2.
7.7.1 For preparation of stock solutions from neat materials, dissolve an appropriate
amount of assayed reference material in solvent. For example, weigh 10 to 20 mg
of lindane to three significant figures in a 10-mL ground-glass-stoppered
volumetric flask and fill to the mark with nonane. After the compound is
completely dissolved, transfer the solution to a clean 15-mL vial with
fluoropolymer-lined cap.
7.7.2 When not being used, store standard solutions in the dark at room temperature in
screw-capped vials with fluoropolymer-lined caps. Place a mark on the vial at the
level of the solution so that solvent loss by evaporation can be detected. Replace
the solution if solvent loss has occurred.
7.8 Native (unlabeled) stock solutions
7.8.1 Native stock solution - Prepare to contain the pesticides at the concentrations
shown in Table 3, or purchase prepared solutions. If additional pesticides are to be
determined, include the additional native compounds in this stock solution.
7.8.2 Stock solutions should be checked for signs of degradation (e.g., discoloration,
precipitation) prior to preparing calibration or performance test standards.
Reference standards that can be used to determine the accuracy of standard
solutions are available from several vendors.
7.9 Labeled compound stock solutions (Table 3)
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Method 1699 December 2007
7.9.1 Labeled pesticide stock solution - Prepare the labeled pesticides in isooctane or
nonane at the concentrations in Table 3 or purchase prepared standards. If
additional pesticides are to be determined by isotope dilution, include the
additional labeled compounds in this stock solution.
7.9.2 Labeled injection internal standard stock solution - Prepare labeled PCB 52 in
nonane or isooctane at the concentration shown in Table 3, or purchase a prepared
standard.
7.10 Calibration standards - Combine and dilute the solutions in Sections 7.8 and 7.9 to produce
the calibration solutions in Table 4 or purchase prepared standards for the CS-1 to CS-6 set
of calibration solutions. These solutions permit the relative response (labeled to native) and
response factor to be measured as a function of concentration. The CS-4 standard is used
for calibration verification (VER).
7.11 Native IPR/OPR standard spiking solution - Used for determining initial precision and
recovery (IPR; Section 9.2) and ongoing precision and recovery (OPR; Section 15.6).
Dilute the Native stock solution (Section 7.8.1) with acetone to produce the concentrations
of the pesticides as shown in Table 3. When 1 mL of this solution is spiked into the IPR
(Section 9.2.1) or OPR (Section 15.6) and concentrated to a final volume of 20 joL, the
concentration of the pesticides in the final volume will be either 8 or 20 ng/mL (pg/OL), as
shown in Table 3. Prepare only the amount necessary for each reference matrix with each
sample batch.
7.12 Labeled standard spiking solution - This solution is spiked into each sample (Section 9.3)
and into the IPR (Section 9.2.1), OPR (Section 15.6), and blank (Section 9.5) to measure
recovery. Dilute the Labeled pesticide stock solution (Section 7.9.1) with acetone to
produce the concentrations of the labeled compounds shown in Table 3. When 1 mL of this
solution is spiked into an IPR, OPR, blank, or sample and concentrated to a final extract
volume of 20 |oL, the concentration in the final volume will be as shown in Table 3.
Prepare only the amount necessary for each reference matrix with each sample batch.
7.13 Endrin/4,4'-DDT breakdown solution - Prepare a solution to contain 100 ng/mL (pg/joL) of
DDT and 50 ng/mL (pg/joL) of endrin in isooctane or nonane. This solution is to determine
endrin/4,4'-DDT breakdown in Sections 10.6 and 15.5.
7.14 Labeled injection internal standard spiking solution - This solution is added to each
concentrated extract prior to injection into the HRGC/HRMS. Dilute the Labeled injection
internal standard stock solution (Section 7.9.2) in nonane to produce a concentration of the
injection internal standards at 800 ng/mL, as shown in Table 3. When 2 |oL of this solution
is spiked into a 20 |oL extract, the concentration of each injection internal standard will be
nominally 80 ng/mL (pg/joL), as shown in Table 3.
Note: The addition of 2 ^L of the Labeled injection internal standard spiking solution to a 20 ^L
final extract has the effect of diluting the concentration of the components in the extract by 10%.
24
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Method 1699 December 2007
Provided all calibration solutions and all extracts undergo this dilution as a result of adding the
Labeled injection internal standard spiking solution, the effect of the 10% solution is compensated,
and correction for this dilution should not be made.
7.15 QC Check Sample - A QC Check Sample should be obtained from a source independent of
the calibration standards. Ideally, this check sample would be a certified Standard
Reference Material (SRM) containing the pesticides in known concentrations in a sample
matrix similar to the matrix under test. The National Institute of Standards and Technology
(NIST) in Gaithersburg, Maryland has SRMs, and the Institute for National Measurement
Standards of the National Research Council of Canada in Ottawa has certified reference
materials (CRMs), for pesticides in various matrices.
7.16 Stability of solutions - Standard solutions used for quantitative purposes (Sections 7.8 -
7.14) should be assayed periodically (e.g., every 6 months) against SRMs from NIST (if
available), or certified reference materials from a source that will attest to the authenticity
and concentration, to assure that the composition and concentrations have not changed.
8.0 Sample collection, preservation, storage, and holding times
8.1 Collect samples in amber glass containers following conventional sampling practices
(Reference 12); collect field and trip blanks as necessary to validate the sampling.
8.2 Aqueous samples
8.2.1 Samples that flow freely are collected as grab samples or in refrigerated bottles
using automatic sampling equipment. Collect 1-L. If high concentrations of the
pesticides are expected, collect a smaller volume (e.g., 100 mL) in addition to the
1-L sample. Do not rinse the bottle with sample before collection.
8.2.2 If residual chlorine is present, add 80 mg sodium thiosulfate per liter of water. Any
method suitable for field use may be employed to test for residual chlorine (Reference
9).
8.2.3 Maintain aqueous samples in the dark at <6°C from the time of collection until
receipt at the laboratory (see 40 CFR 136.6(e), Table II). If the sample will be
frozen, allow room for expansion.
8.2.4 If the sample will not be analyzed within 72 hours, adjust the pH to a range of 5.0
to 9.0 with sodium hydroxide or sulfuric acid solution. Record the volume of acid
or base used.
8.3 Solid, mixed-phase, semi-solid, and oily samples, excluding tissue.
8.3.1 Collect samples as grab samples using wide-mouth jars. Collect a sufficient
amount of wet material to produce a minimum of 20 g of solids.
25
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Method 1699 December 2007
8.3.2 Maintain solid, semi-solid, oily, and mixed-phase samples in the dark at <6°C from
the time of collection until receipt at the laboratory. Store solid, semi-solid, oily,
and mixed-phase samples in the dark at less than -10°C.
8.4 Fish and other tissue samples
8.4.1 Fish may be cleaned, filleted, or processed in other ways in the field, such that the
laboratory may expect to receive whole fish, fish fillets, or other tissues for
analysis.
8.4.2 Collect fish, wrap in aluminum foil, and maintain at <6°C from the time of
collection until receipt at the laboratory, to a maximum time of 24 hours. If a
longer transport time is necessary, freeze the sample. Ideally, fish should be frozen
upon collection and shipped to the laboratory under dry ice.
8.4.3 Freeze tissue samples upon receipt at the laboratory and maintain in the dark at less
than -10°C until prepared. Maintain unused sample in the dark at less than -10°C.
8.4.4 Store sample extracts in the dark at less than -10°C until analyzed.
8.5 Holding times - See 40 CFR 136.3(e) Table II
8.5.1 Aqueous samples - Extract within 7 days of collection, and analyze within 40 days
of extraction.
8.5.2 Solid, mixed-phase, semi-solid, tissue, and oily samples - Extract and analyze
within 1 year of collection. If a sample is to be stored for more than 14 days, and
results are to be reported in solids units, either hermetically seal the sample
container or determine the moisture content upon receipt and immediately prior to
analysis. Adjust the final concentration based on the original moisture content.
9.0 Quality assurance/quality control
9.1 Each laboratory that uses this Method is required to operate a formal quality assurance
program (Reference 14). The minimum requirements of this program consist of an initial
demonstration of laboratory capability, analysis of samples spiked with labeled compounds
to evaluate and document data quality, and analysis of standards and blanks as tests of
continued performance. Laboratory performance is compared to established performance
criteria to determine if the results of analyses meet the performance characteristics of the
Method.
If the Method is to be applied to a sample matrix other than water (e.g., soils, filter cake,
compost, tissue) the most appropriate alternate reference matrix (Sections 7.6.2 - 7.6.5 and
7.15) is substituted for the reagent water matrix (Section 7.6.1) in all performance tests.
26
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Method 1699 December 2007
9.1.1 The laboratory must make an initial demonstration of the ability to generate
acceptable precision and recovery with this Method. This demonstration is given
in Section 9.2.
9.1.2 In recognition of advances that are occurring in analytical technology, and to
overcome matrix interferences, the laboratory is permitted certain options to
improve separations or lower the costs of measurements. These options include
alternate extraction, concentration, and cleanup procedures, and changes in
columns and detectors (see also 40 CFR 136.6). Alternate determinative
techniques, such as the substitution of spectroscopic or immuno-assay techniques,
and changes that degrade Method performance, are not allowed. If an analytical
technique other than the techniques specified in this Method is used, that technique
must have a specificity equal to or greater than the specificity of the techniques in
this Method for the analytes of interest.
9.1.2.1 Each time a modification is made to this Method, the laboratory is
required to repeat the procedure in Section 9.2. If the detection limit of
the Method will be affected by the change, the laboratory is required to
demonstrate that the MDLs (40 CFR Part 136, Appendix B) are lower
than one-third the regulatory compliance level or the MDLs in this
Method, whichever are greater. If calibration will be affected by the
change, the instrument must be recalibrated per Section 10. Once the
modification is demonstrated to produce results equivalent or superior to
results produced by this Method as written, that modification may be
used routinely thereafter, so long as the other requirements in this
Method are met (e.g., labeled compound recovery).
9.1.2.2 The laboratory is required to maintain records of modifications made to
this Method. These records include the following, at a minimum:
9.1.2.2.1 The names, titles, addresses, and telephone numbers of the
analyst(s) that performed the analyses and modification, and
of the quality control officer that witnessed and will verify
the analyses and modifications.
9.1.2.2.2 A listing of pollutant(s) measured, by name and CAS
Registry number.
9.1.2.2.3 A narrative stating reason(s) for the modifications.
9.1.2.2.4 Results from all quality control (QC) tests comparing the
modified method to this Method, including:
a) Calibration (Section 10)
b) Calibration verification (Section 15.3)
c) Initial precision and recovery (Section 9.2)
d) Labeled compound recovery (Section 9.3)
27
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Method 1699 December 2007
e) Analysis of blanks (Section 9.5)
f) Accuracy assessment (Section 9.4)
9.1.2.2.5 Data that will allow an independent reviewer to validate each
determination by tracing the instrument output (peak height,
area, or other signal) to the final result. These data are to
include:
a) Sample numbers and other identifiers
b) Extraction dates
c) Analysis dates and times
d) Analysis sequence/run chronology
e) Sample weight or volume (Section 11)
f) Extract volume prior to each cleanup step (Section 13)
g) Extract volume after each cleanup step (Section 13)
h) Final extract volume prior to injection (Section 14)
i) Injection volume (Sections 10.3 and 14.3)
j) Dilution data, differentiating between dilution of a
sample or extract (Section 17.5)
k) Instrument and operating conditions
1) Column (dimensions, liquid phase, solid support, film
thickness, etc)
m) Operating conditions (temperatures, temperature
program, flow rates)
n) Detector (type, operating conditions, etc)
o) Chromatograms, printer tapes, and other recordings of
raw data
p) Quantitation reports, data system outputs, and other data
to link the raw data to the results reported
9.1.2.3 Alternate HRGC columns and column systems - If a column or column
system alternate to those specified in this Method is used, that column or
column system must meet the requirements in Section 6.9.1.
9.1.3 Analyses of method blanks are required to demonstrate freedom from
contamination (Section 4.3). The procedures and criteria for analysis of a method
blank are given in Sections 9.5 and 15.7.
9.1.4 The laboratory must spike all samples with labeled compounds to monitor Method
performance. This test is described in Section 9.3. When results of these spikes
indicate atypical Method performance for samples, the samples are diluted to bring
Method performance within acceptable limits. Procedures for dilution are given in
Section 17.5.
9.1.5 The laboratory must, on an ongoing basis, demonstrate through calibration verifica-
tion and the analysis of the ongoing precision and recovery standard (OPR) and
28
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Method 1699 December 2007
blanks that the analytical system is in control. These procedures are given in
Sections 15.1 through 15.7.
9.1.6 The laboratory should maintain records to define the quality of data generated.
Development of accuracy statements is described in Sections 9.4 and 15.6.4.
9.2 Initial precision and recovery (IPR) - To establish the ability to generate acceptable
precision and recovery, the laboratory must perform the following operations:
9.2.1 For low solids (aqueous) samples, extract, concentrate, and analyze four 1-L
aliquots of reagent water spiked with 1 mL each of the Native spiking solution
(Section 7.11) and the Labeled spiking solution (Section 7.12), according to the
procedures in Sections 11 through 18. For an alternate sample matrix, four aliquots
of the alternate reference matrix (Sections 7.6.1 - 7.6.5) are used. All sample
processing steps that are to be used for processing samples, including preparation
(Section 11), extraction (Section 12), and cleanup (Section 13), must be included in
this test.
9.2.2 Using results of the set of four analyses, compute the average percent recovery (X)
of the extracts and the relative standard deviation (RSD) of the concentration for
each compound, by isotope dilution for pesticides with a labeled analog, and by
internal standard for pesticides without a labeled analog and for the labeled
compounds.
9.2.3 For each pesticide and labeled compound, compare RSD and X with the
corresponding limits for initial precision and recovery in Table 5. If RSD and X
for all compounds meet the acceptance criteria, system performance is acceptable
and analysis of blanks and samples may begin. If, however, any individual RSD
exceeds the precision limit or any individual X falls outside the range for recovery,
system performance is unacceptable for that compound. Correct the problem and
repeat the test (Section 9.2).
9.3 To assess Method performance on the sample matrix, the laboratory must spike all samples
with the Labeled spiking solution (Section 7.12).
9.3.1 Analyze each sample according to the procedures in Sections 11 through 18.
9.3.2 Compute the percent recovery of the labeled pesticides using the internal standard
method (Section 17.2).
9.3.3 The recovery of each labeled compound must be within the limits in Table 5. If the
recovery of any compound falls outside of these limits, Method performance is
unacceptable for that compound in that sample. Additional cleanup procedures
must then be employed to attempt to bring the recovery within the normal range. If
the recovery cannot be brought within the normal range after all cleanup
procedures have been employed, water samples are diluted and smaller amounts of
soils, sludges, sediments, and other matrices are analyzed per Section 18.
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Method 1699 December 2007
9.4 It is suggested but not required that recovery of labeled compounds from samples be
assessed and records maintained.
9.4.1 After the analysis of 30 samples of a given matrix type (water, soil, sludge, pulp,
etc.) for which the labeled compounds pass the tests in Section 9.3, compute the
average percent recovery (R) and the standard deviation of the percent recovery
(SR) for the labeled compounds only. Express the assessment as a percent recovery
interval from R ! 2SR to R + 2SR for each matrix. For example, if R = 90% and SR
= 10% for five analyses of pulp, the recovery interval is expressed as 70 to 110%.
9.4.2 Update the accuracy assessment for each labeled compound in each matrix on a
regular basis (e.g., after each five to ten new measurements).
9.5 Method blanks - A reference matrix Method blank is analyzed with each sample batch
(Section 4.3) to demonstrate freedom from contamination. The matrix for the Method
blank must be similar to the sample matrix for the batch, e.g., a 1-L reagent water blank
(Section 7.6.1), high-solids reference matrix blank (Section 7.6.2), paper matrix blank
(Section 7.6.3); tissue blank (Section 7.6.4), or alternate reference matrix blank (Section
7.6.5).
9.5.1 Spike 1.0 mL each of the Labeled spiking solution (Section 7.12) into the Method
blank, according to the procedures in Sections 11 through 18. Prepare, extract,
clean up, and concentrate the Method blank. Analyze the blank immediately after
analysis of the OPR (Section 15.6) to demonstrate freedom from contamination.
9.5.2 If any pesticide (Table 1) is found in the blank at greater than the minimum level
(Table 1) or one-third the regulatory compliance limit, whichever is greater; or if
any potentially interfering compound is found in the blank at the minimum level
for each pesticide in Table 1 (assuming a response factor of 1 relative to the
quantitation reference in Table 2 for a potentially interfering compound; i.e., a
compound not listed in this Method), analysis of samples must be halted until the
sample batch is re-extracted and the extracts re-analyzed, and the blank associated
with the sample batch shows no evidence of contamination at these levels. All
samples must be associated with an uncontaminated Method blank before the
results for those samples may be reported or used for permitting or regulatory
compliance purposes.
9.6 QC Check Sample - Analyze the QC Check Sample (Section 7.15) periodically to assure
the accuracy of calibration standards and the overall reliability of the analytical process. It
is suggested that the QC Check Sample be analyzed at least quarterly.
9.7 The specifications contained in this Method can be met if the apparatus used is calibrated
properly and then maintained in a calibrated state. The standards used for calibration
(Section 10), calibration verification (Section 15.3), and for initial (Section 9.2) and
ongoing (Section 15.6) precision and recovery should be identical, so that the most precise
results will be obtained. A GC/HRMS instrument will provide the most reproducible
30
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Method 1699
December 2007
results if dedicated to the settings and conditions required for determination of pesticides by
this Method.
9.8 Depending on specific program requirements, field replicates may be collected to determine
the precision of the sampling technique, and spiked samples may be required to determine
the accuracy of the analysis when the internal standard method is used.
10.0 Calibration
10.1 Establish the operating conditions necessary to meet the retention times (RTs) and relative
retention times (RRTs) for the pesticides in Table 2.
10.1.1 Suggested operating conditions:
GC conditions
Injector
Carrier gas
Injector temperature
Maximum column temperature
GC Temperature program
Initial temperature and hold
Initial ramp
Second hold
Second ramp
Third hold
Third ramp
Final hold
Interface temperature
Mass spectrometer conditions
Source temperature
Electron energy
Trap current
Mass resolution
Detector potential
Split/splitless, 2 min
Helium @ 200 kPa
180 - 220°C or temperature programmed
300°C
50°C for 1 minute
50 - 180°C @ 10°C per minute
180°C for 0 minute
180-200°C@1.5°C per minute
200°C for 2 minutes
200 - 295°C @ 6°C per minute
295°C for 1 minutes or until methoxychlor elutes
290°C
250°C
35 eV
500 - 900 OA
8000
340 - 400 V
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Method 1699 December 2007
10.1.1.1 All portions of the column that connect the GC to the ion source should
remain at or above the interface temperature during analysis to preclude
condensation of less volatile compounds.
10.1.1.2 The GC conditions may be optimized for compound separation and
sensitivity. Once optimized, the same GC conditions must be used for
the analysis of all standards, blanks, IPR and OPR standards, and
samples.
10.1.2 Retention time calibration for the native and labeled pesticides
10.1.2.1 Inject the CS-4 calibration standard (Section 7.10 and Table 4).
Establish the beginning and ending retention times for the scan
descriptors in Table 6. Scan descriptors other than those listed in Table 6
may be used provided the MLs in Table 1 are met. Store the retention
time (RT) and relative retention time (RRT) for each compound in the
data system.
10.1.2.2 The absolute retention time of methoxychlor must exceed 39 minutes on
the DB-17 column; otherwise, the GC temperature program must be
adjusted and this test repeated until the minimum retention time criterion
is met. If a GC column or column system alternate to the DB-17 column
is used, a similar minimum retention time specification must be
established for the alternate column or column systems so that
interferences that may be encountered in environmental samples will be
resolved from the analytes of interest. This specification is deemed to be
met if the retention time of methoxychlor is greater than 39 minutes on
such alternate column.
10.2 Mass spectrometer (MS) resolution
10.2.1 Using PFK (or other reference substance) and a molecular leak, tune the instrument
to meet the minimum required resolving power of 8,000 (10% valley) at m/z
280.9825 or other significant PFK fragment in the range of 250 - 300. For each
descriptor (Table 6), monitor and record the resolution and exact m/z's of three to
five reference peaks covering the mass range of the descriptor. The level of PFK
(or other reference substance) metered into the HRMS during analyses should be
adjusted so that the amplitude of the most intense selected lock-mass m/z signal
(regardless of the descriptor number) does not exceed 10% of the full-scale
deflection for a given set of detector parameters. Under those conditions,
sensitivity changes that might occur during the analysis can be more effectively
monitored.
Note: Different lots and types of PFK can contain varying levels of contamination, and excessive
PFK (or other reference substance) may cause noise problems and contamination of the ion source
necessitating increased frequency of source cleaning.
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Method 1699 December 2007
10.2.2 The analysis time for the pesticides may exceed the long-term mass stability of the
mass spectrometer. Because the instrument is operated in the high-resolution
mode, mass drifts of a few ppm (e.g., 5 ppm in mass) can have serious adverse
effects on instrument performance. Therefore, mass-drift correction is mandatory
and a lock-mass m/z from perfluorokerosene (PFK) or other reference substance is
used for drift correction. The lock-mass m/z is dependent on the exact m/z's
monitored within each descriptor, as shown in Table 6. The deviation between
each monitored exact m/z and the theoretical m/z (Table 6) must be less than 5
ppm.
10.2.3 Obtain a selected ion current profile (SICP) at the two exact m/z's specified in
Table 6 and at 38,000 resolving power for each native and labeled pesticide.
Because of the extensive mass range covered in each function, it may not be
possible to maintain 8,000 resolution throughout the mass range during the
function. Therefore, resolution must be 36,000 throughout the mass range and
must be 38,000 in the center of the mass range for each function.
10.2.4 If the HRMS has the capability to monitor resolution during the analysis, it is
acceptable to terminate the analysis when the resolution falls below the minimum
(Section 10.2.1 and 10.2.3) to save re-analysis time.
10.3 Ion abundance ratios, minimum levels, and signal-to-noise ratios during calibration.
Choose an injection volume of either 1 or 2 (iL, consistent with the capability of the
HRGC/HRMS instrument. Inject a 1 or 2 (iL aliquot of the CS-1 calibration solution
(Table 4) using the GC conditions in Section 10.1.1.
10.3.1 Measure the SICP areas for each pesticide, and compute the ion abundance ratios at
the exact m/z's specified in Table 6. Compare the computed ratio to the theoretical
ratio given in Table 6.
10.3.1.1 The exact m/z's to be monitored in each descriptor are shown in Table 6.
Each group or descriptor must be monitored in succession as a function
of GC retention time to ensure that the pesticides are detected.
Additional m/z's may be monitored in each descriptor, and the m/z's may
be divided among more than the descriptors listed in Table 6, provided
that the laboratory is able to monitor the m/z's of all pesticides that may
elute from the GC in a given RT window.
10.3.1.2 The mass spectrometer must be operated in a mass-drift correction mode,
using PFK (or other reference substance) to provide lock m/z's. The lock
mass for each group of m/z's is shown in Table 6. Each lock mass must
be monitored and must not vary by more than V 20% throughout its
respective retention time window. Variations of lock mass by more than
20% indicate the presence of co-eluting interferences that raise the
source pressure and may significantly reduce the sensitivity of the mass
spectrometer. Re-injection of another aliquot of the sample extract may
not resolve the problem and additional cleanup of the extract may be
33
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Method 1699 December 2007
required to remove the interference. A lock mass interference or
suppression in a retention time region in which pesticides and labeled
compounds do not elute may be ignored.
1 0.3.2 All pesticides and labeled compounds in the CS-1 standard must be within the QC
limits in Table 6 for their respective ion abundance ratios; otherwise, the mass
spectrometer must be adjusted and this test repeated until the m/z ratios fall within
the limits specified. If the adjustment alters the resolution of the mass
spectrometer, resolution must be verified (Section 10.2.1) prior to repeat of the test.
1 0.3.3 Verify that the HRGC/HRMS instrument meets the minimum levels (MLs) in
Table 1. The peaks representing the pesticides and labeled compounds in the CS-1
calibration standard must have signal-to-noise ratios (S/N) 3 3; otherwise, the mass
spectrometer must be adjusted and this test repeated until the minimum levels in
Table 1 are met.
10.4 Calibration by isotope dilution - Isotope dilution is used for calibration of the native
pesticides for which a labeled analog is available. The reference compound for each native
compound is its labeled analog, as listed in Table 2. A 6-point calibration encompassing
the concentration range is prepared for each native compound.
1 0.4.1 For the pesticides determined by isotope dilution, the relative response (RR)
(labeled to native) vs. concentration in the calibration solutions (Table 4) is
computed over the calibration range according to the procedures described below.
Five calibration points are employed for less-sensitive HRMS instruments (e.g.,
VG 70); five or six points may be employed for more -sensitive instruments (e.g.,
Micromass Autospec Ultima).
1 0.4.2 Determine the response of each pesticide relative to its labeled analog using the
area responses of both the primary and secondary exact m/z's specified in Table 6,
for each calibration standard. Use the labeled compounds listed in Table 2 as the
quantitation reference and the two exact m/z's listed in Table 6 for quantitation.
The areas at the two exact m/z's for the compound is summed and divided by the
summed area of the two exact m/z's for the quantitation reference.
Note: Both exact m/z's are used as reference to reduce the effect of an interference at a single m/z.
Other quantitation references and procedures may be used provided that the results produced are as
accurate as results produced by the quantitation references and procedures described in this Section.
1 0.4.3 Calibrate the native compounds with a labeled analog using the following equation:
RR = (A
Where:
A \n and A2n = The areas of the primary and secondary m/z's for the
pesticide
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Method 1699 December 2007
A\i and A2t = The areas of the primary and secondary m/z's for the
labeled compound.
Ci = The concentration of the labeled compound in the
calibration standard (Table 4).
Cn = The concentration of the native compound in the
calibration standard (Table 4).
10.4.4 To calibrate the analytical system by isotope dilution, inject calibration standards
CS-2 through CS-6 (Section 7.10 and Table 4) for a less sensitive instrument (e.g.
VG 70) or CS-1 through CS-6 for a more sensitive instrument (e.g., Micromass
Autospec Ultima). Use a volume identical to the volume chosen in Section 10.3,
the procedure in Section 14, and the conditions in Section 10.1.1. Compute and
store the relative response (RR) for each pesticide at each concentration. Compute
the average (mean) RR and the RSD of the 6 RRs.
10.4.5 Linearity - If the RRs for any pesticide are constant (less than 20% RSD), the
average RRmay be used for that pesticide; otherwise, the complete calibration
curve for that pesticide must be used over the calibration range.
10.5 Calibration by internal standard - Internal standard calibration is applied to determination
of the native pesticides for which a labeled compound is not available, and to determination
of the labeled compounds for performance tests and intra-laboratory statistics (Sections 9.4
and 15.6.4). The reference compound for each compound is listed in Table 2. For the
labeled compounds, calibration is performed at a single concentration using data from the 6
points in the calibration (Section 10.4).
10.5.1 Response factors - Internal standard calibration requires the determination of
response factors (RF) defined by the following equation:
RF= (A
(Alls+A2ls)Cs
Where:
A \s and A2S = The areas of the primary and secondary m/z's for the
pesticide.
A\is and A2is = The areas of the primary and secondary m/z's for the
internal standard.
Cis = The concentration of the internal standard (Table 4).
Cs = The concentration of the compound in the calibration
standard (Table 4).
10.5.2 To calibrate the analytical system for pesticides that do not have a labeled analog,
and for the labeled compounds, use the data from the 6-point calibration (Section
10.4.4 and Table 4).
10.5.3 Compute and store the response factor (RF) for all native pesticides that do not
have a labeled analog and for the labeled compounds. Use the labeled compounds
35
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Method 1699 December 2007
listed in Table 2 as the quantitation reference and the two exact m/z's listed in
Table 6 for quantitation. For example, the areas at the two exact m/z's for the
compound is summed and divided by the summed area of the two exact m/z's for
the quantitation reference.
10.5.4 Compute and store the response factor (RF) for the labeled compounds using the
Labeled injection internal standard as the quantitation reference, as given in Table
2.
10.5.5 Linearity - If the RFs for any pesticide are constant (less than 35% RSD), the
average RF may be used for that pesticide; otherwise, the complete calibration
curve for that pesticide must be used over the calibration range.
10.6 Endrin/4,4'-DDT breakdown - This test is run after calibration (Section 10.4 and 10.5) or
calibration verification (Section 15.3) to assure that the labile pesticides do not decompose
in the GC.
10.6.1 Inject the endrin/4,4'-DDT breakdown solution (Section 7.13) using the same
volume chosen in Section 10.3.
10.6.2 Measure and sum the peak areas for both exact m/z's separately for 4,4'-DDD, 4,4'-
DDE, 4,4'-DDT, endrin, endrin aldehyde, and endrin ketone using the calibration
data from Section 10.4.
10.6.2.1 Add the summed peak areas for endrin aldehyde and endrin ketone and
separately add the peak areas for 4,4'-DDD and 4,4'-DDE.
10.6.2.2 Calculate the endrin and 4,4'-DDT breakdown as follows:
Endrin breakdown (percent) = (areas for endrin aldehyde + endrin ketone) xlOO
areas for endrin
4,4'-DDTbreakdown (percent) = (areas for 4.4'-DDD + 4,4'-DDE) xWO
areas for 4,4'-DDT
10.6.2.3 If the breakdown of endrin or 4,4'-DDT exceeds 20 percent, endrin or
4,4'-DDT is decomposing. If decomposition greater than 20 percent of
either endrin or 4,4'-DDT occurs, clean and recondition the injector,
break off a short section of the inlet end of the column, or alter the GC
conditions to reduce the decomposition to where the 20 percent criterion
is met (see Section 6.9.1.2).
11.0 Sample preparation
11.1 Sample preparation involves modifying the physical form of the sample so that the
pesticides can be extracted efficiently. In general, the samples must be in a liquid form or
36
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Method 1699 December 2007
in the form of finely divided solids in order for efficient extraction to take place. Table 7
lists the phases and suggested quantities for extraction of various sample matrices.
For samples known or expected to contain high levels of the pesticides, the smallest sample
size representative of the entire sample should be used (see Section 18). For all samples,
the blank and IPR/OPR aliquots must be processed through the same steps as the sample to
check for contamination and losses in the preparation processes.
11.1.1 For samples that contain particles, percent solids and particle size are determined
using the procedures in Sections 11.2 and 11.3, respectively.
11.1.2 Aqueous samples - Because the pesticides may be bound to suspended particles,
the preparation of aqueous samples is dependent on the solids content of the
sample.
11.1.2.1 Aqueous samples containing one percent solids or less are prepared per
Section 11.4 and extracted directly using one of the extraction
techniques in Section 12.2.
11.1.2.2 For aqueous samples containing greater than one percent solids, a
sample aliquot sufficient to provide 10 g of dry solids is used, as
described in Section 11.5.
11.1.3 Solid Samples - Solid samples are prepared using the procedure described in
Section 11.5 followed by extraction using the SDS procedure in Section 12.3.
11.1.4 Multi-phase samples - The phase(s) containing the pesticides is separated from the
non-pesticide phase using pressure filtration and centrifugation, as described in
Section 11.6. The pesticides will be in the organic phase in a multi-phase sample
in which an organic phase exists.
11.1.5 Procedures for grinding, homogenization, and blending of various sample phases
are given in Section 11.7.
11.1.6 Tissue samples - Preparation procedures for fish and other tissues are given in
Section 11.8.
11.2 Determination of percent suspended solids
Note: 777/5 aliquot is used for determining the solids content of the sample, not for pesticide
determination.
11.2.1 Aqueous liquids and multi-phase samples consisting of mainly an aqueous phase.
11.2.1.1 Desiccate and weigh a GF/D filter (Section 6.5.3) to three significant
figures.
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Method 1699 December 2007
11.2.1.2 Filter 10.0 V0.02 mL of well-mixed sample through the filter.
11.2.1.3 Dry the filter a minimum of 12 hours at 110 ± 5°C and cool in a
desiccator.
11.2.1.4 Calculate percent solids as follows:
% Solids = Weight of sample aliquot after drying (g) - weight of filter (g) xlOO
Wg
11.2.2 Non-aqueous liquids, solids, semi-solid samples, and multi-phase samples in which
the main phase is not aqueous; but not tissues.
11.2.2.1 Weigh 5 to 10 g of sample to three significant figures in a tared beaker.
11.2.2.2 Dry a minimum of 12 hours at 110 V5°C, and cool in a desiccator.
11.2.2.3 Calculate percent solids as follows:
% Solids = Weight of sample aliquot after drying x 100
Weight of sample aliquot before drying
11.3 Estimation of particle size
11.3.1 Spread the dried sample from Section 11.2.1.3 or 11.2.2.2 on apiece of filter paper
or aluminum foil in a fume hood or glove box.
11.3.2 Estimate the size of the particles in the sample. If the size of the largest particles is
greater than 1 mm, the particle size must be reduced to 1 mm or less prior to
extraction using the procedures in Section 11.7.
11.4 Preparation of aqueous samples containing one percent suspended solids or less.
11.4.1 Aqueous samples containing one percent suspended solids or less are prepared
using the procedure below and extracted using the one of the extraction techniques
in Section 12.2.
11.4.2 Preparation of sample and QC aliquots
11.4.2.1 Mark the original level of the sample on the sample bottle for reference.
Weigh the sample plus bottle to V 1 g.
11.4.2.2 Spike 1.0 mL of the Labeled pesticide spiking solution (Section 7.12)
into the sample bottle. Cap the bottle and mix the sample by shaking.
Allow the sample to equilibrate for 1 to 2 hours, with occasional
shaking.
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Method 1699 December 2007
11.4.2.3 For each sample or sample batch (to a maximum of 20 samples) to be
extracted during the same 12-hour shift, place two 1.0-L aliquots of
reagent water in clean sample bottles or flasks.
11.4.2.4 Spike 1.0 mL of the Labeled pesticide spiking solution (Section 7.12)
into both reagent water aliquots. One of these aliquots will serve as the
Method blank.
11.4.2.5 Spike 1.0 mL of the Native pesticide spiking solution (Section 7.11)
into the remaining reagent water aliquot. This aliquot will serve as the
OPR (Section 15.6).
11.4.2.6 For extraction using SPE, add 5 mL of methanol to the sample and QC
aliquots. Cap and shake the sample and QC aliquots to mix thoroughly,
and proceed to Section 12.2 for extraction.
11.5 Preparation of samples containing greater than one percent solids.
11.5.1 Weigh a well-mixed aliquot of each sample (of the same matrix type) sufficient to
provide 10 g of dry solids (based on the solids determination in Section 11.2) into a
clean beaker or glass jar, to a maximum of 1 L of sample.
11.5.2 Spike 1.0 mL of the Labeled pesticide spiking solution (Section 7.12) into the
sample.
11.5.3 Prepare the blank and OPR aliquots per Sections 11.4.2.3 - 11.4.2.5.
11.5.4 Stir or tumble and equilibrate the aliquots for 1 to 2 hours.
11.5.5 Decant excess water. If necessary to remove water, filter the sample through a
glass-fiber filter and discard the aqueous liquid.
11.5.6 If particles >1 mm are present in the sample (as determined in Section 11.3.2),
spread the sample on clean aluminum foil in a hood. After the sample is dry, grind
to reduce the particle size (Section 11.7).
11.5.7 Extract the sample and QC aliquots using the SDS procedure in Section 12.3.1.
11.6 Multi-phase samples, including high solids municipal sludge samples
11.6.1 Using the percent solids determined in Section 11.2.1.4 or 11.2.2.3, determine the
volume of sample that will provide 10 g of solids, up to 1 L of sample.
11.6.2 Spike 1.0 mL of the Labeled pesticide spiking solution (Section 7.12) into the
amount of sample determined in Section 11.6.1, and into the OPR and blank.
39
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Method 1699 December 2007
11.6.3 Prepare the blank and OPRaliquots per Sections 11.4.2.3 - 11.4.2.5.
11.6.4 Pressure filter the sample, blank, and OPR through Whatman GF/D glass-fiber
filter paper (Section 6.5.3). If necessary to separate the phases and/or settle the
solids, centrifuge these aliquots prior to filtration. Discard any aqueous phase (if
present). Remove any non-aqueous liquid present and reserve the maximum
amount filtered from the sample (Section 11.5.5) or 10 g, whichever is less, for
combination with the solid phase (Section 12.3.1.5).
11.6.5 If particles >1 mm are present in the sample (as determined in Section 11.3.2) and
the sample is capable of being dried, spread the sample and QC aliquots on clean
aluminum foil in a hood. Observe the precaution in Section 5.3.1.
11.6.6 After the aliquots are dry or if the sample cannot be dried, reduce the particle size
using the procedures in Section 11.7 and extract the reduced-size particles using the
SDS procedure in Section 12.3. If particles >1 mm are not present, extract the
particles and filter in the sample and QC aliquots directly using the SDS procedure
in Section 12.3.
11.7 Sample grinding, homogenization, or blending - Samples with particle sizes greater than 1
mm (as determined in Section 11.3.2) are subjected to grinding, homogenization, or
blending. The method of reducing particle size to less than 1 mm is matrix-dependent. In
general, hard particles can be reduced by grinding with a mortar and pestle. Softer particles
can be reduced by grinding in a Wiley mill or meat grinder, by homogenization, or in a
blender.
11.7.1 Each size-reducing preparation procedure on each matrix must be verified by
running the tests in Section 9.2 before the procedure is employed routinely.
11.7.2 The grinding, homogenization, or blending procedures must be carried out in a
glove box or fume hood to prevent particles from contaminating the work
environment.
11.7.3 Grinding - Certain papers and pulps, slurries, and amorphous solids can be ground
in a Wiley mill or heavy duty meat grinder. In some cases, reducing the
temperature of the sample to freezing or to dry ice or liquid nitrogen temperatures
can aid in the grinding process. Grind the sample aliquots from Sections 11.5.7 or
11.6.6 in a clean grinder. Do not allow the sample temperature to exceed 50°C.
Grind the blank and reference matrix aliquots using a clean grinder.
11.7.4 Homogenization or blending - Particles that are not ground effectively, or particles
greater than 1 mm in size after grinding, can often be reduced in size by high speed
homogenization or blending. Homogenize and/or blend the particles or filter from
Sections 11.5.7 or 11.6.6 for the sample, blank, and OPRaliquots.
11.7.5 Extract the aliquots using the SDS procedure in Section 12.3.1.
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Method 1699 December 2007
11.8 Fish and other tissues - Prior to processing tissue samples, the laboratory must determine
the exact tissue to be analyzed. Common requests for analysis offish tissue include whole
fish-skin on, whole fish-skin removed, edible fish fillets (filleted in the field or by the
laboratory), specific organs, and other portions. Once the appropriate tissue has been
determined, the sample must be homogenized.
11.8.1 Tissue homogenization
11.8.1.1 Samples are homogenized while still frozen, where practical. If the
laboratory must dissect the whole fish to obtain the appropriate tissue
for analysis, the unused tissues may be rapidly refrozen and stored in a
clean glass jar for subsequent use.
11.8.1.2 Each analysis requires 10 g of tissue (wet weight). Therefore, the
laboratory should homogenize at least 20 g of tissue to allow for re-
extraction of a second aliquot of the same homogenized sample, if re-
analysis is required. When whole fish analysis is necessary, the entire
fish is homogenized.
11.8.1.3 Homogenize the sample in a tissue homogenizer (Section 6.3.3) or grind
in a meat grinder (Section 6.3.4). Cut tissue too large to feed into the
grinder into smaller pieces. To assure homogeneity, grind three times.
11.8.1.4 Transfer approximately 10 g (wet weight) of homogenized tissue to a
clean, tared, 400- to 500-mL beaker.
11.8.1.5 Transfer the remaining homogenized tissue to a clean jar with a
fluoropolymer-lined lid. Seal the jar and store the tissue at less than
-10°C. Return any tissue that was not homogenized to its original
container and store at less than -10°C.
11.8.2 Tissue QC aliquots
11.8.2.1 Prepare a Method blank by adding approximately 1-2 g of the oily
liquid reference matrix (Section 7.6.4) to a 400- to 500-mL beaker.
Record the weight to the nearest 10 mg.
11.8.2.2 Prepare an ongoing precision and recovery aliquot by adding 1-2 g of
the oily liquid reference matrix (Section 7.6.4) to a separate 400- to
500-mL beaker. Record the weight to the nearest 10 mg.
11.8.3 Spiking
11.8.3.1 Spike 1.0 mL of the Labeled pesticide spiking solution (Section 7.12)
into the sample, blank, and OPR aliquot.
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Method 1699 December 2007
11.8.3.2 Spike 1.0 mL of the Native spiking solution (Section 7.11) into the OPR
aliquot.
11.8.4 Extract the aliquots using the Soxhlet procedure in Section 12.4.
12.0 Extraction and concentration
12.1 Extraction procedures include: solid phase (Section 12.2.1), separatory runnel (Section
12.2.2), or continuous liquid/liquid (Section 12.2.3) for aqueous liquids; Soxhlet/Dean-
Stark (Section 12.3.1) for sludge, solids and filters; and Soxhlet extraction (Section 12.4)
for tissues.
Macro-concentration procedures include: rotary evaporation (Section 12.6.1), heating
mantle (Section 12.6.2), and Kuderna-Danish (K-D) evaporation (Section 12.6.3). Micro-
concentration uses nitrogen evaporation (Section 12.7).
12.2 Extraction of aqueous liquids - separatory or continuous liquid/liquid extraction.
12.2.1 Solid-phase extraction of samples containing less than one percent solids
12.2.1.1 Disk preparation
12.2.1.1.1 Remove the test tube from the suction flask (Figure 4).
Place an SPE disk on the base of the filter holder and
wet with methylene chloride. While holding a GMF 150
filter above the SPE disk with tweezers, wet the filter
with methylene chloride and lay the filter on the SPE
disk, making sure that air is not trapped between the
filter and disk. Clamp the filter and SPE disk between
the 1-L glass reservoir and the vacuum filtration flask.
12.2.1.1.2 Rinse the sides of the reservoir with approx 15 mL of
methylene chloride using a squeeze bottle or pipet.
Apply vacuum momentarily until a few drops appear at
the drip tip. Release the vacuum and allow the filter/disk
to soak for approx one minute. Apply vacuum and draw
all of the methylene chloride through the filter/disk.
Repeat the wash step with approx 15 mL of acetone and
allow the filter/disk to air dry.
12.2.1.2 Sample extraction
12.2.1.2.1 Pre-wetthe disk by adding approx 20 mL of methanol to
the reservoir. Pull most of the methanol through the
filter/disk, retaining a layer of methanol approx 2 mm
42
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Method 1699 December 2007
thick on the filter. Do not allow the filter/disk to go dry
from this point until the extraction is completed.
12.2.1.2.2 Add approx 20 mL of reagent water to the reservoir and
pull most through, leaving a layer approx 2 mm thick on
the filter/disk.
12.2.1.2.3 Allow the sample (Section 11.4.2.6) to stand for 1-2
hours, if necessary, to settle the suspended particles.
Decant the clear layer of the sample, the blank (Section
11.4.2.4), or IPR/OPR aliquot (Section 11.4.2.5) into its
respective reservoir and turn on the vacuum to begin the
extraction. Adjust the vacuum to complete the
extraction in no less than 10 minutes. For samples
containing a high concentration of particles (suspended
solids), the extraction time may be an hour or longer.
12.2.1.2.4 Before all of the sample has been pulled through the
filter/disk, add approx 50 mL of reagent water to the
sample bottle, swirl to suspend the solids (if present),
and pour into the reservoir. Pull through the filter/disk.
Use additional reagent water rinses until all solids are
removed.
12.2.1.2.5 Before all of the sample and rinses have been pulled
through the filter/disk, rinse the sides of the reservoir
with small portions of reagent water.
12.2.1.2.6 Partially dry the filter/disk under vacuum for approx 3
minutes.
43
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Method 1699 December 2007
12.2.1.3 Elution of the filter/disk
12.2.1.3.1 Release the vacuum, remove the entire
filter/disk/reservoir assembly from the vacuum flask, and
empty the flask. Insert a test tube for eluant collection
into the flask. The test tube should have sufficient
capacity to contain the total volume of the elution
solvent (approx 50 mL) and should fit around the drip
tip. The drip tip should protrude into the test tube to
preclude loss of sample from spattering when vacuum is
applied (see Figure 4). Re-assemble the
filter/disk/reservoir assembly on the vacuum flask.
12.2.1.3.2 Wet the filter/disk with 4-5 mL of acetone. Allow the
acetone to spread evenly across the disk and soak for 15-
20 seconds. Pull the acetone through the disk, releasing
the vacuum when approx 1 mm thickness remains on the
filter.
12.2.1.3.3 Rinse the sample bottle with approx 20 mL of methylene
chloride and transfer to the reservoir. Pull approx half of
the solvent through the filter/disk and release the
vacuum. Allow the filter/disk to soak for approx 1
minute. Pull all of the solvent through the disk. Repeat
the bottle rinsing and elution step with another 20 mL of
methylene chloride. Pull all of the solvent through the
disk.
12.2.1.3.4 Release the vacuum, remove the filter/disk/reservoir
assembly, and remove the test tube containing the
sample solution. Quantitatively transfer the solution to a
250-mL separatory funnel and proceed to Section 12.5
for back-extraction.
12.2.2 Separatory funnel extraction
12.2.2.1 Pour the spiked sample (Section 11.4.2.2) into a 2-L separatory funnel.
Rinse the bottle or flask twice with 5 mL of reagent water and add these
rinses to the separatory funnel.
12.2.2.2 Add 100 mL methylene chloride to the empty sample bottle. Cap the
bottle and shake 60 seconds to rinse the inner surface. Transfer the
solvent to the separatory funnel, and extract the sample by shaking the
funnel for 2 minutes with periodic venting. Allow the organic layer to
separate from the aqueous phase for a minimum of 10 minutes. If an
emulsion forms and is more than one-third the volume of the solvent
layer, employ mechanical techniques to complete the phase separation
44
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Method 1699 December 2007
(see note below). Drain the methylene chloride extract through a
solvent-rinsed glass funnel and dry over anhydrous sodium sulfate
(Section 7.2.1) into an Erlenmeyer flask (1 L).
Note: If an emulsion forms, the laboratory must employ mechanical techniques to complete the
phase separation. The optimum technique depends upon the sample, but may include stirring,
filtration through glass wool, use of phase separation paper, centrifugation, use of an ultrasonic bath
with ice, addition ofNaCl, or other physical methods. Alternatively, solid-phase (Section 12.2.1),
CLLE (Section 12.2.3), or other extraction techniques may be used to prevent emulsion formation.
Any alternative technique is acceptable so long as the requirements in Section 9.2 are met.
12.2.2.3 Extract the water sample two more times with 100-mL portions of
methylene chloride. Dry each portion over anhydrous sodium sulfate .
After the third extraction, rinse the separatory funnel with at least 20
mL of methylene chloride, and add to the three 100-mL portions of
methylene chloride. Repeat this rinse at least twice. Allow the
methylene chloride extract to dry for 30 min. Transfer to a solvent-
rinsed concentration device (Section 12.6).
12.2.2.4 Add 1 mL of a toluene "keeper" to the extract and concentrate using one
of the macro-concentration procedures in Section 12.6, then proceed to
back extraction in Section 12.5.
12.2.3 Continuous liquid/liquid extraction
12.2.3.1 Place 100-150 mL methylene chloride in each continuous extractor and
200-300 mL in each distilling flask.
12.2.3.2 Pour the sample(s), blank, and QC aliquots into the extractors. Rinse
the sample containers with 50-100 mL methylene chloride and add to
the respective extractors. Include all solids in the extraction process.
12.2.3.3 Begin the extraction by heating the flask until the methylene chloride is
boiling. When properly adjusted, 1-2 drops of methylene chloride per
second will fall from the condenser tip into the water. Extract for 16-24
hours.
12.2.3.4 Remove the distilling flask, estimate and record the volume of extract
(to the nearest 100 mL), and pour the contents through a drying column
containing 7 to 10 cm of granular anhydrous sodium sulfate into the
concentration flask. Rinse the distilling flask with 30-50 mL of
methylene chloride and pour through the drying column.
12.2.3.5 Add 1 mL of a toluene "keeper" to the extract and concentrate using one
of the macro-concentration procedures in Section 12.6, then proceed to
back extraction in Section 12.5.
45
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Method 1699 December 2007
12.3 Extraction of solids - Solid or sludge samples_are extracted using a Soxhlet/Dean-Stark
extractor (Section 12.3.1).
12.3.1 Soxhlet/Dean-Stark extraction
12.3.1.1 Charge a clean extraction thimble (Section 6.4.2.2) with 5.0 g of
100/200 mesh silica (Section 7.5.1.1) topped with 100 g of quartz sand
(Section 7.3.2). Do not disturb the silica layer throughout the extraction
process.
12.3.1.2 Place the thimble in a clean extractor. Place 30 to 40 mL of toluene in
the receiver and 200 to 250 mL of toluene in the flask.
12.3.1.3 Pre-extract the glassware by heating the flask until the toluene is
boiling. When properly adjusted, 1 to 2 drops of toluene will fall per
second from the condenser tip into the receiver. Extract the apparatus
for a minimum of 3 hours.
12.3.1.4 After pre-extraction, cool and disassemble the apparatus. Rinse the
thimble with toluene and allow to air dry.
12.3.1.5 Load the wet sample and/or filter from Sections 11.5.7, 11.6.6, or 11.7.5
and any non-aqueous liquid from Section 11.6.4 into the thimble and
manually mix into the sand layer with a clean metal spatula, carefully
breaking up any large lumps of sample.
12.3.1.6 Reassemble the pre-extracted SDS apparatus, and add a fresh charge of
300 mL 80:20 toluene:acetone to the receiver and reflux flask. Apply
power to the heating mantle to begin re-fluxing. Adjust the reflux rate
to match the rate of percolation through the sand and silica beds until
water removal lessens the restriction to toluene flow. Frequently check
the apparatus for foaming during the first 2 hours of extraction. If
foaming occurs, reduce the reflux rate until foaming subsides. Soxhlet
extract for 12-24 hours.
12.3.1.7 Drain the water from the receiver at 1-2 hours and 8-9 hours, or sooner
if the receiver fills with water. After 12-24 hours cool and disassemble
the apparatus. Record the total volume of water collected.
12.3.1.8 Remove the distilling flask. Drain the water from the receiver and add
any toluene in the receiver to the extract in the flask.
12.3.1.9 Concentrate the extracts from particles to approximately 10 mL using
the rotary evaporator (Section 12.6.1) or heating mantle (Section
12.6.2), transfer to a 250-mL separatory funnel, and proceed with back-
extraction (Section 12.5).
46
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Method 1699 December 2007
12.4 Soxhlet extraction of tissue
Note: This procedure includes determination of the lipid content of the sample (Section 12.4.9),
using the same sample extract that is analyzed by GC/HRMS. Alternatively, a separate sample
aliquot may be used for the lipid determination. If a separate aliquot is used for GC/HRMS
determination, use nitrogen to evaporate the main portion of the sample extract only to the extent
necessary to effect the solvent exchange to n-hexane, so that loss of low molecular weight pesticides
is avoided, i.e., it is not necessary to dry the main portion of the sample to constant weight (Section
12.4.8).
12.4.1 Add 30 to 40 g of powdered anhydrous sodium sulfate (Section 7.2.2) to each of
the beakers (Section 11.8.4) and mix thoroughly. Cover the beakers with
aluminum foil and dry until the mixture becomes a free-flowing powder (30
minutes minimum). Remix prior to extraction to prevent clumping.
12.4.2 Assemble and pre-extract the Soxhlet apparatus per Sections 12.3.1-12.3.1.4,
except use methylene chloride for the pre-extraction and rinsing and omit the
quartz sand.
12.4.3 Re-assemble the pre-extracted Soxhlet apparatus and add a fresh charge of
methylene chloride to the reflux flask.
12.4.4 Transfer the sample/sodium sulfate mixture (Section 12.4.1) to the Soxhlet thimble,
and install the thimble in the Soxhlet apparatus.
12.4.5 Rinse the beaker with several portions of solvent and add to the thimble. Fill the
thimble/receiver with solvent. Extract for 18-24 hours.
12.4.6 After extraction, cool and disassemble the apparatus.
12.4.7 Quantitatively transfer the extract to a macro-concentration device (Section 12.6)
and concentrate to near dryness. Set aside the concentration apparatus for re-use.
12.4.8 Complete the removal of the solvent using the nitrogen blowdown procedure
(Section 12.7) and a water bath temperature of 60°C. Weigh the receiver, record
the weight, and return the receiver to the blowdown apparatus, concentrating the
residue until a constant weight is obtained.
12.4.9 Percent lipid determination
12.4.9.1 Re-dissolve the residue in the receiver in hexane.
12.4.9.2 Transfer the residue/hexane to the anthropogenic isolation column
(Section 13.6); retaining the boiling chips in the concentration
apparatus. Use several rinses to assure that all material is transferred. If
necessary, sonicate or heat the receiver slightly to assure that all
47
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Method 1699 December 2007
material is re-dissolved. Allow the receiver to dry. Weigh the receiver
and boiling chips.
12.4.9.3 Calculate the lipid content to the nearest three significant figures as
follows:
Percent lipid = Weight of residue (g) xlOO
Weight of tissue (g)
12.4.9.4 The laboratory should determine the lipid content of the blank, IPR, and
OPRto assure that the extraction system is working effectively.
12.5 Back-extraction with base and acid
Note: Some pesticides may be decomposed by acid or base. If acid or base back-extraction is
employed, the laboratory must evaluate the strengths of the acid and base solutions, and the exposure
times, to preclude decomposition.
12.5.1 Back-extraction may not be necessary for some samples, and back-extraction with
strong acid and/or base with long contact times may destroy some pesticides. For
some samples, the presence of color in the extract may indicate that back-extraction
is necessary. If back-extraction is not necessary, concentrate the extract for
cleanup or analysis (Section 12.6 and/or 12.7). If back-extraction is necessary,
back-extract the extracts from Section 12.2.3.5 or 12.3.1.9 as follows:
12.5.2 Back-extract each extract three times sequentially with 500 mL of the aqueous
sodium sulfate solution (Section 7.1.5), returning the bottom (organic) layer to the
separatory funnel the first two times while discarding the top (aqueous) layer. On
the final back-extraction, filter each pesticide extract through a prerinsed drying
column containing 7 to 10 cm anhydrous sodium sulfate into a 500- to 1000-mL
graduated cylinder. Record the final extract volume ._Re-concentrate the sample and
QC aliquots per Sections 12.6-12.7, and clean up the samples and QC aliquots per
Section 13.
12.6 Macro-concentration - Extracts in toluene are concentrated using a rotary evaporator or a
heating mantle; extracts in methylene chloride or hexane are concentrated using a rotary
evaporator, heating mantle, or Kuderna-Danish apparatus.
Note: In the concentration procedures below, the extract must not be allowed to concentrate to
dryness because low molecular weight pesticides may be totally or partially lost. It may be
advantageous to add 1 mL of toluene as a "keeper" to prevent loss of the low molecular weight
pesticides.
12.6.1 Rotary evaporation - Concentrate the extracts in separate round-bottom flasks.
12.6.1.1 Assemble the rotary evaporator according to manufacturer's
instructions, and warm the water bath to 45°C. On a daily basis, pre-
48
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Method 1699 December 2007
clean the rotary evaporator by concentrating 100 mL of clean extraction
solvent through the system. Archive both the concentrated solvent and
the solvent in the catch flask for a contamination check if necessary.
Between samples, three 2- to 3- mL aliquots of solvent should be rinsed
down the feed tube into a waste beaker.
12.6.1.2 Attach the round-bottom flask containing the sample extract to the
rotary evaporator. Slowly apply vacuum to the system, and begin
rotating the sample flask.
12.6.1.3 Lower the flask into the water bath, and adjust the speed of rotation and
the temperature as required to complete concentration in 15 to 20
minutes. At the proper rate of concentration, the flow of solvent into the
receiving flask will be steady, but no bumping or visible boiling of the
extract will occur.
Note: If the rate of concentration is too fast, analyte loss may occur.
12.6.1.4 When the liquid in the concentration flask has reached an apparent
volume of approximately 2 mL, remove the flask from the water bath
and stop the rotation. Slowly and carefully admit air into the system.
Be sure not to open the valve so quickly that the sample is blown out of
the flask. Rinse the feed tube with approximately 2 mL of solvent.
12.6.1.5 Proceed to Section 12.5 for back-extraction or Section 12.7 for micro-
concentration and solvent exchange.
12.6.2 Heating mantle - Concentrate the extracts in separate round-bottom flasks.
12.6.2.1 Add one or two clean boiling chips to the round-bottom flask, and
attach a three-ball macro Snyder column. Prewet the column by adding
approximately 1 mL of solvent through the top. Place the round-bottom
flask in a heating mantle, and apply heat as required to complete the
concentration in 15 to 20 minutes. At the proper rate of distillation, the
balls of the column will actively chatter, but the chambers will not
flood.
12.6.2.2 When the liquid has reached an apparent volume of approximately 10
mL, remove the round-bottom flask from the heating mantle and allow
the solvent to drain and cool for at least 10 minutes. Remove the
Snyder column and rinse the glass joint into the receiver with small
portions of solvent.
12.6.2.3 Proceed to Section 12.6 for preparation for back-extraction or Section
12.7 for micro-concentration and solvent exchange.
49
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Method 1699 December 2007
12.6.3 Kuderna-Danish (K-D) - Concentrate the extracts in separate 500-mL K-D flasks
equipped with 10-mL concentrator tubes. The K-D technique is used for solvents
such as methylene chloride and hexane. Toluene is difficult to concentrate using
the K-D technique unless a water bath fed by a steam generator is used.
12.6.3.1 Add 1 to 2 clean boiling chips to the receiver. Attach a three-ball macro
Snyder column. Prewet the column by adding approximately 1 mL of
solvent through the top. Place the K-D apparatus in a hot water bath so
that the entire lower rounded surface of the flask is bathed with steam.
12.6.3.2 Adjust the vertical position of the apparatus and the water temperature
as required to complete the concentration in 15 to 20 minutes. At the
proper rate of distillation, the balls of the column will actively chatter
but the chambers will not flood.
12.6.3.3 When the liquid has reached an apparent volume of 1 mL, remove the
K-D apparatus from the bath and allow the solvent to drain and cool for
at least 10 minutes. Remove the Snyder column and rinse the flask and
its lower joint into the concentrator tube with 1 to 2 mL of solvent. A 5-
mL syringe is recommended for this operation.
12.6.3.4 Remove the three-ball Snyder column, add a fresh boiling chip, and
attach a two ball micro Snyder column to the concentrator tube. Prewet
the column by adding approximately 0.5 mL of solvent through the top.
Place the apparatus in the hot water bath.
12.6.3.5 Adjust the vertical position and the water temperature as required to
complete the concentration in 5 to 10 minutes. At the proper rate of
distillation, the balls of the column will actively chatter but the
chambers will not flood.
12.6.3.6 When the liquid reaches an apparent volume of 0.5 mL, remove the
apparatus from the water bath and allow to drain and cool for at least 10
minutes.
12.6.3.7 Proceed to 12.6 for preparation for back-extraction or Section 12.7 for
micro-concentration and solvent exchange.
12.7 Micro-concentration and solvent exchange
12.7.1 Extracts to be subjected to GPC cleanup are exchanged into methylene chloride.
Extracts to be cleaned up using silica gel, Florisil, the SPE cartridge, and/or HPLC
are exchanged into hexane.
12.7.2 Transfer the vial containing the sample extract to a nitrogen evaporation device.
Adjust the flow of nitrogen so that the surface of the solvent is just visibly
disturbed.
50
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Method 1699 December 2007
Note: A large vortex in the solvent may cause analyte loss.
12.7.3 Lower the vial into a 30°C water bath and continue concentrating.
12.7.3.1 If the extract or an aliquot of the extract is to be concentrated to dryness
for weight determination (Sections 12.4.8 and 13.6.4), blow dry until a
constant weight is obtained.
12.7.3.2 If the extract is to be concentrated for injection into the GC/HRMS or
the solvent is to be exchanged for extract cleanup, proceed as follows:
12.7.4 When the volume of the liquid is approximately 100 joL, add 2 to 3 mL of the
desired solvent (methylene chloride for GPC and HPLC, or hexane for the other
cleanups) and continue concentration to approximately 100 (iL. Repeat the
addition of solvent and concentrate once more.
12.7.5 If the extract is to be cleaned up by GPC, adjust the volume of the extract to 5.0
mL with methylene chloride. If the extract is to be cleaned up by HPLC,
concentrate the extract to 1.0 mL. Proceed with GPC or HPLC cleanup (Section
13.2 or 13.5, respectively).
12.7.6 If the extract is to be cleaned up by column chromatography or the SPE cartridge,
bring the final volume to 1.0 mL with hexane. Proceed with column cleanup
(Sections 13.3, 13.4, 13.7, or 13.8).
12.7.7 If the extract is to be concentrated for injection into the GC/HRMS (Section 14),
quantitatively transfer the extract to a 0.3-mL conical vial for final concentration,
rinsing the larger vial with hexane and adding the rinse to the conical vial. Reduce
the volume to approximately 100 |oL. Add 20 |oL of nonane to the vial, and
evaporate the solvent to the level of the nonane. Seal the vial and label with the
sample number. Store in the dark at room temperature until ready for GC/HRMS
analysis. If GC/HRMS analysis will not be performed on the same day, store the
vial at less than -10°C.
13.0 Extract cleanup
13.1 Cleanup may not be necessary for relatively clean samples (e.g., treated effluents,
groundwater, drinking water). If particular circumstances require the use of a cleanup
procedure, the laboratory may use any or all of the procedures below or any other
appropriate procedure. Before using a cleanup procedure, the laboratory must demonstrate
that the requirements of Section 9.2 can be met using the cleanup procedure. The following
table suggests cleanups that may be used for the various analyte groups.
Analyte group
All
Suggested cleanups
GPC (13.2); SPE (13.3); Micro-silica (13.4)
51
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Method 1699 December 2007
Organo-chlorine
Specific
compounds
GPC,
GPC,
SPE,
SPE,
Micro-silica
Micro-silica
plus
plus
Florisil (13.7)
HPLC(13.5)
or alumina (13
8)
13.1.1 Gel permeation chromatography (Section 13.2) removes high molecular weight
interferences that cause GC column performance to degrade. It should be used for
all soil and sediment extracts. It may be used for water extracts that are expected to
contain high molecular weight organic compounds (e.g., polymeric materials,
humic acids). It should also be used for tissue extracts after initial cleanup on the
anthropogenic isolation column (Section 13.6).
13.1.2 Micro-silica (Section 13.4), the SPE cartridge (Section 13.3), Florisil (Section
13.7), and alumina (Section 13.8) may be used to remove non-polar and polar
interferences.
13.1.3 HPLC (Section 13.5) is used to provide specificity for certain pesticides.
13.1.4 The anthropogenic isolation column (Section 13.6) is used for removal of lipids
from tissue samples.
13.2 Gel permeation chromatography (GPC)
13.2.1 Column packing
13.2.1.1 Place 70 to 75 g of SX-3 Bio-beads (Section 6.7.1.1) in a 400-to 500-
mL beaker.
13.2.1.2 Cover the beads with methylene chloride and allow to swell overnight
(a minimum of 12 hours).
13.2.1.3 Transfer the swelled beads to the column (Section 6.7.1.1) and pump
solvent through the column, from bottom to top, at 4.5 to 5.5 mL/minute
prior to connecting the column to the detector.
13.2.1.4 After purging the column with solvent for 1 to 2 hours, adjust the
column head pressure to 7 to 10 psig and purge for 4 to 5 hours to
remove air. Maintain a head pressure of 7 to 10 psig. Connect the
column to the detector (Section 6.7.1.4).
13.2.2 Column calibration
13.2.2.1 Load 5 mL of the GPC calibration solution (Section 7.4) into the sample
loop.
13.2.2.2 Inject the GPC calibration solution and record the signal from the
detector. The elution pattern will be corn oil, bis(2-ethylhexyl) phthalate
(BEHP), methoxychlor, perylene, and sulfur.
52
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Method 1699 December 2007
13.2.2.3 Set the "dump time" to allow >85% removal of BEHP and >85%
collection of methoxychlor.
13.2.2.4 Set the "collect time" to the time of the sulfur peak maximum.
13.2.2.5 Verify calibration with the GPC calibration solution after every 20
extracts. Calibration is verified if the recovery of methoxychlor is
greater than 85%. If calibration is not verified, the system must be
recalibrated using the GPC calibration solution, and the previous sample
batch must be re-extracted and cleaned up using a calibrated GPC
system.
13.2.3 Extract cleanup - GPC requires that the column not be overloaded. The column
specified in this Method is designed to handle a maximum of 0.5 g of material from
an aqueous, soil, or mixed-phase sample in a 5-mL extract, and has been shown to
handle 1.5 g of lipid from a tissue sample in a 5-mL extract. If the extract is known
or expected to contain more than these amounts, the extract is split into aliquots for
GPC, and the aliquots are combined after elution from the column. The residue
content of the extract may be obtained gravimetrically by evaporating the solvent
from a 50-|oL aliquot.
13.2.3.1 Filter the extract or load through the filter holder (Section 6.7.1.3) to
remove particles. Load the 5.0-mL extract onto the column.
13.2.3.2 Elute the extract using the calibration data determined in Section 13.2.2.
Collect the eluate in a clean 400- to 500-mL beaker. Allow the system
to rinse for additional 10 minutes before injecting the next sample.
13.2.3.3 Rinse the sample loading tube thoroughly with methylene chloride
between extracts to prepare for the next sample.
13.2.3.4 If an extract is encountered that could overload the GPC column to the
extent that carry-over could occur, a 5.0-mL methylene chloride blank
must be run through the system to check for carry-over.
13.2.3.5 Concentrate the eluate per Sections 12.6 and 12.7 for further cleanup or
injection into the GC/MS.
13.3 Solid-phase extraction (SPE) cartridge
13.3.1 Setup
13.3.1.1 Attach the Vac-elute manifold (6.7.6.1) to a water aspirator or vacuum
pump with the trap and gauge installed between the manifold and
vacuum source.
53
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Method 1699 December 2007
13.3.1.2 Place the SPE cartridge(s) in the manifold, turn on the vacuum source,
and adjust the vacuum to 5 to 10 psig.
Note: Do not allow the SPE cartridge to go dry during the following steps.
13.3.2 Cartridge washing - Pre-elute the cartridge sequentially with two 6-mL volumes of
1:2:1 ethyl acetate:acetonitrile:toluene.
13.3.3 Using a pipette or a 1-mL syringe, transfer 1.0 mL of the extract in 1:2:1 ethyl
acetate:acetonitrile:toluene (Section_12.2.3.5, 12.3.1.9, 12.4.8 or 12.5.2) onto the
SPE cartridge followed by a rinse of 1 mL 1:2:1 ethyl acetate:acetonitrile:toluene.
13.3.4 As soon as the sample is loaded, begin to collect the eluate in a round bottom flask
or centrifuge tube (if using a manifold). Elute the SPE cartridge with 11 mL of
1:2:1 ethyl acetate:acetonitrile: toluene.
13.3.5 Concentrate the eluted extract per Sections 12.6 and 12.7 and proceed to other
cleanups or determination by HRGC/HRMS.
13.4 Micro-silica column
13.4.1 Place a small glass-wool plug in a clean Pasteur pipette. Rinse the pipette and glass
wool twice with small (e.g., 2-5 mL) volumes of toluene, followed by two
rinsings with small volumes of hexane. Allow the pipette to drain. Dry pack the
column bottom to top with 0.75 gram of 10% deactivated silica (Section 7.5.1.1).
Tap the column to settle the silica.
13.4.2 Rinse the column with hexane until the column is completely wetted (typically 5-
10 mL). Allow the hexane to drain to the top of the silica.
13.4.3 Adjust the extract volume to 1.0 mL and apply to the column. Allow the extract to
drain to the top of the silica. Rinse the extract onto the column with 500 |oL of
hexane.
13.4.4 Rinse the centrifuge tube that contained the extract with 300-|oL of 10% methanol
in dichloromethane and apply to the column. Collect the eluate in a round-bottom
flask. Repeat this rinse and collect the eluate in the flask.
13.4.5 Elute the column with 5 mL of 10% methanol in dichloromethane. Collect the
eluate in the round bottom flask.
13.4.6 Add 5 mL of acetone and 1 mL of iso-octane to the round bottom flask and
concentrate the eluate per Section 12.6 and 12.7 for further cleanup or injection
intotheHPLCorGC/MS.
54
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Method 1699 December 2007
13.4.7 For extracts of samples known to contain large quantities of other organic
compounds, it may be advisable to increase the capacity of the silica gel column.
This may be accomplished by increasing the strength of the acid silica and
including basic silica gel. The acid silica gel (Section 7.5.1.2) may be increased in
strength to as much as 40% w/w (6.7 g sulfuric acid added to 10 g silica gel). The
basic silica gel (Section 7.5.1.3) may be increased in strength to as much as 33%
w/w (50 mL IN NaOH added to 100 g silica gel), or the potassium silicate (Section
7.5.1.4) may be used. Larger columns may also be used if needed.
Note: The use of stronger acid and basic silica gel (44% w/w) may lead to charring of organic
compounds in some extracts. The charred material may retain some of the analytes and lead to lower
recoveries of the pesticides. Increasing the strengths of the acid and basic silica gel may also require
different volumes ofeluants than those specified above to elute the analytes from the column. The
performance of the Method after such modifications must be verified by the procedure in Section 9.2.
13.5 HPLC (Reference 9)
13.5.1 Column calibration
13.5.1.1 Prepare a calibration standard containing the pesticides at the
concentrations of the stock solution in Table 3, or at a concentration
appropriate to the response of the detector.
13.5.1.2 Inject the calibration standard into the HPLC and record the signal from
the detector. Collect the eluant for reuse.
13.5.1.3 Establish the collection time for the pesticides of interest. Following
calibration, flush the injection system with solvent to ensure that
residual pesticides are removed from the system.
13.5.1.4 Verify the calibration with the calibration solution after every 20
extracts. Calibration is verified if the recovery of the pesticides is 75 to
125% compared to the calibration (Section 13.5.1.1). If calibration is
not verified, the system must be recalibrated using the calibration
solution, and the batch of samples run on the uncalibrated system must
be re-extracted and cleaned up using a calibrated system.
13.5.2 Extract cleanup - HPLC requires that the column not be overloaded. The column
specified in this Method is designed to handle a maximum of 50 Og of a given
pesticide, depending on the particular compound. If the amount of material in the
extract will overload the column, split the extract into fractions and combine the
fractions after elution from the column.
13.5.2.1 Rinse the sides of the vial containing the sample and adjust to the
volume required for the sample loop for injection.
13.5.2.2 Inject the sample extract into the HPLC.
55
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Method 1699 December 2007
13.5.2.3 Elute the extract using the calibration data determined in Section 13.5.1.
Collect the fraction(s) in clean 20-mL concentrator tubes.
13.5.2.4 If an extract containing greater than 500 (ig of total material is encoun-
tered, a blank must be run through the system to check for carry-over.
13.5.2.5 Concentrate the eluate per Section 12.7 for injection into the
GC/HRMS.
13.6 Anthropogenic isolation column (Reference 15) - Used for removal of lipids from tissue
extracts
13.6.1 Prepare the column as given in Section 7.5.2.
13.6.2 Pre-elute the column with 100 mL of hexane. Drain the hexane layer to the top of
the column, but do not expose the sodium sulfate.
13.6.3 Load the sample and rinses (Section 12.4.9.2) onto the column by draining each
portion to the top of the bed. Elute the pesticides from the column into the
apparatus used for concentration (Section 12.4.7) using 200 mL of hexane.
13.6.4 Remove a small portion (e.g., 50 joL) of the extract for determination of residue
content. Estimate the percent of the total that this portion represents. Concentrate
the small portion to constant weight per Section 12.7.3.1. Calculate the total
amount of residue in the extract. If more than 500 mg of material remains, repeat
the cleanup using a fresh anthropogenic isolation column.
13.6.5 If necessary, exchange the extract to a solvent suitable for the additional cleanups
to be used (Section 13.2-13.8).
13.6.6 Clean up the extract using the procedures in Sections 13.2 - 13.8. GPC (Section
13.2) and Florisil (Section 13.7) are recommended as minimum additional cleanup
steps.
13.6.7 Following cleanup, concentrate the extract to 20 OL per Section 12.7 and proceed
with the analysis in Section 14.
13.7 Florisil
13.7.1 Begin to drain the n-hexane from the column (Section 7.5.4.3). Adjust the flow
rate of eluantto 4.5-5.0 mL/min.
13.7.2 When the n-hexane is within 1 mm of the sodium sulfate, apply the sample extract
(in hexane) to the column. Rinse the sample container twice with 1-mL portions of
hexane and apply to the column, allowing the hexane to drain to the top of the
sodium sulfate layer.
56
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Method 1699 December 2007
13.7.3 Elute Fraction 1 with 200 mL of 6% ethyl ether in n-hexane and collect the eluate.
Elute Fraction 2 with 200 mL of 15% ethyl ether in hexane and collect the eluate.
Elute Fraction 3 with 50% ethyl ether in hexane and collect the eluate. The exact
volumes of solvents will need to be determined for each batch of Florisil. If the
pesticides are not to be collected in separate fractions, elute all pesticides with 50%
ethyl ether in hexane.
13.7.4 Concentrate the eluate(s) per Sections 12.6 - 12.7 for further cleanup or for
injection into the HPLC or GC/HRMS.
13.8 Alumina
13.8.1 Begin to drain the hexane from the column (Section 7.5.5.2). Adjust the flow rate
of eluantto 4.5 - 5.0 mL/min.
13.8.2 When the n-hexane is within 1 mm of the sodium sulfate, apply the sample extract
(in hexane) to the column. Rinse the sample container twice with 1-mL portions of
hexane and apply to the column, allowing the hexane to drain to the top of the
sodium sulfate layer.
13.8.3 Elute the pesticides with 150 mL of n-hexane. If all pesticides are not eluted, elute
the remaining pesticides with 50 mL of 15% methylene chloride in n-hexane.
13.8.4 Concentrate the eluate(s) per Sections 12.6 - 12.7 for further cleanup or for
injection into the HPLC or GC/HRMS.
14.0 HRGC/HRMS analysis
14.1 Establish the operating conditions given in Section 10.1.
14.2 Add 2 |oL of the labeled injection internal standard spiking solution (Section 7.14) to the 20
(iL sample extract immediately prior to injection to minimize the possibility of loss by
evaporation, adsorption, or reaction. If an extract is to be reanalyzed and evaporation has
occurred, do not add more labeled injection internal standard spiking solution. Rather,
bring the extract back to its previous volume (e.g., 19 joL) with pure nonane (18 |oL if 2 |oL
injections are used).
14.3 Inject 1.0 or 2.0 joL of the concentrated extract containing the Labeled injection internal
standards using on-column or splitless injection. The volume injected must be identical to
the volume used for calibration (Section 10.3).
14.3.1 Start the GC column initial isothermal hold upon injection. Start MS data
collection after the solvent peak elutes.
57
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Method 1699 December 2007
14.3.2 Monitor the exact m/z's for each pesticide throughout its retention time window.
Where warranted, monitor m/z's associated with pesticides at higher levels of
chlorination to assure that fragments are not interfering with the m/z's for
pesticides at lower levels of chlorination. Also where warranted, monitor m/z's
associated with interferents expected to be present.
14.3.3 Stop data collection after permethrin and cypermethrin have eluted. Return the
column to the initial temperature for analysis of the next sample extract or standard.
15.0 System and laboratory performance
15.1 At the beginning of each 12-hour shift during which analyses are performed, GC/MS
system performance and calibration are verified for all the pesticides and labeled
compounds. For these tests, analysis of the CS-4 calibration verification (VER) standard
(Section 7.10 and Table 4) must be used to verify all performance criteria. Adjustment
and/or recalibration (Section 10) must be performed until all performance criteria are met.
Only after all performance criteria are met may samples, blanks, IPRs, and OPRs be
analyzed.
15.2 MS resolution - Static resolving power checks must be performed at the beginning and at
the end of each shift per Sections 10.2.1. If analyses are performed on successive shifts,
only the beginning of shift static resolving power check is required. If the requirement in
Section 10.2.1 cannot be met, the problem must be corrected before analyses can proceed.
If any of the samples in the previous shift may be affected by poor resolution, those
samples must be re-analyzed.
15.3 Calibration verification
15.3.1 Inject the VER (CS-4) calibration standard using the procedure in Section 14.
15.3.2 The m/z abundance ratios for all pesticides must be within the limits in Table 6;
otherwise, the mass spectrometer must be adjusted until the m/z abundance ratios
fall within the limits specified when the verification test is be repeated. If the
adjustment alters the resolution of the mass spectrometer, resolution must be
verified (Section 10.2.1) prior to repeat of the verification test.
15.3.3 The GC peak representing each native pesticide and labeled compound in the VER
standard must be present with a S/N of at least 10; otherwise, the mass
spectrometer must be adjusted and the verification test repeated.
15.3.4 Compute the concentration of the pesticides that have labeled analogs by isotope
dilution and the concentration of the pesticides that do not have labeled analogs by
the internal standard technique. These concentrations are computed based on the
calibration data in Section 10.
58
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Method 1699 December 2007
15.3.5 For each compound, compare the concentration with the calibration verification
limit in Table 5. If all compounds meet the acceptance criteria, calibration has
been verified and analysis of standards and sample extracts may proceed. If,
however, any compound fails its respective limit, the measurement system is not
performing properly. In this event, prepare a fresh calibration standard or correct
the problem and repeat the resolution (Section 15.2) and verification (Section 15.3)
tests, or recalibrate (Section 10).
15.4 Retention times and GC resolution
15.4.1 Retention times.
15.4.1.1 Absolute - The absolute retention times of the Labeled compounds in
the verification test (Section 15.3) must be within V 15 seconds of the
respective retention times in the calibration (Section 10.1)
15.4.1.2 Relative - The relative retention times of native pesticides and the
labeled compounds in the verification test (Section 15.3) must be within
their respective RRT limits in Table 2 or, if an alternate column or
column system is employed, within their respective RRT limits for the
alternate column or column system (Sections 9.1.2.3 and 6.9.1).
15.4.1.3 If the absolute or relative retention time of any compound is not within
the limits specified, the GC is not performing properly. In this event,
adjust the GC and repeat the verification test (Section 15.3) or
recalibrate (Section 10), or replace the GC column and either verify
calibration or recalibrate.
15.4.2 GC resolution and minimum analysis time
15.4.2.1 The resolution and minimum analysis time specifications in Sections
6.9.1.1.2 and 6.9.1.1.1, respectively, must be met for the DB-17 column
or, if an alternate column or column system is employed, must be met as
specified for the alternate column or column system (Sections 9.1.2.3
and 6.9.1). If these specifications are not met, the GC analysis
conditions must be adjusted until the specifications are met, or the
column must be replaced and the calibration verification tests repeated
Sections 15.3 - 15.4), or the system must be recalibrated (Section 10).
15.4.2.2 After the resolution and minimum analysis time specifications are met,
update the retention times and relative retention times, but not the
relative responses and response factors. For the relative responses and
response factors, the multi-point calibration data (Sections 10.4 and
10.5) must be used.
59
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Method 1699 December 2007
15.5 Endrin/4,4'-DDT breakdown - Perform the endrin/4,4'-DDT breakdown test (Section 10.6).
The breakdown specification (Section 10.6.2.3) must be met before an OPR, sample, or
blank may be analyzed.
15.6 Ongoing precision and recovery
15.6.1 Analyze the extract of the ongoing precision and recovery (OPR) aliquot (Section
11.4.2.5, 11.5.3, 11.6.3, or 11.8.3.2) prior to analysis of samples from the same
batch.
15.6.2 Compute the percent recovery of the pesticides with labeled analogs by isotope
dilution (Section 10.4). Compute the percent recovery of each labeled compound
by the internal standard method (Section 10.5).
15.6.3 For the pesticides and labeled compounds, compare the recovery to the OPR limits
given in Table 5. If all compounds meet the acceptance criteria, system
performance is acceptable and analysis of blanks and samples may proceed. If,
however, any individual concentration falls outside of the range given, the
extraction/concentration processes are not being performed properly for that
compound. In this event, correct the problem, re-prepare, extract, and clean up the
sample batch and repeat the ongoing precision and recovery test (Section 15.6).
15.6.4 If desired, add results that pass the specifications in Section 15.6.3 to initial
(Section 9.4) and previous ongoing data for each compound in each matrix.
Update QC charts to form a graphic representation of continued laboratory
performance. Develop a statement of laboratory accuracy for each pesticide in
each matrix type by calculating the average percent recovery (R) and the standard
deviation of percent recovery (SR). Express the accuracy as a recovery interval
from R ! 2SR to R + 2SR. For example, if R = 95% and SR = 5%, the accuracy is 85
to 105%.
15.7 Blank - Analyze the Method blank extracted with each sample batch immediately
following analysis of the OPR aliquot to demonstrate freedom from contamination and
freedom from carryover from the OPR analysis. If pesticides will be carried from the OPR
into the Method blank, analyze one or more aliquots of solvent between the OPR and the
Method blank. The results of the analysis of the blank must meet the specifications in
Section 9.5.2 before sample analyses may proceed.
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Method 1699 December 2007
16.0 Qualitative determination
A pesticide or labeled compound is identified in a standard, blank, or sample when all of the
criteria in Sections 16.1 through 16.4 are met.
16.1 The signals for the two exact m/z's in Table 6 must be present and must maximize within
the same two scans.
16.2 The signal-to-noise ratio (S/N) for the GC peak at each exact m/z must be greater than or
equal to 2.5 for each pesticide detected in a sample extract, and greater than or equal to 10
for all pesticides in the calibration and verification standards (Sections 10.3.3 and 15.6.3).
16.3 The ratio of the integrated areas of the two exact m/z's specified in Table 6 must be within
the limit in Table 6, or within V 15 percent of the ratio in the midpoint (CS-4) calibration or
calibration verification (VER), whichever is most recent.
16.4 The relative retention time of the peak for a pesticide must be within the RRT QC limits
specified in Table 2 or within similar limits developed from calibration data (Section
10.1.2). If an alternate column (Section 9.1.2.3) is employed, the RRT for the pesticide
must be within its respective RRT QC limits for the alternate column or column system
(Section 6.9.1).
Note: For native pesticides determined by internal standard quantitation, a pesticide with the same
exact m/z's as other pesticides may fall within more than one RT window and be mis-identified unless
the RRT windows are made very narrow, as in Table 2. Therefore, consistency of the RT and RRT
with other pesticides and the labeled compounds may be required for rigorous pesticide
identification. Retention time regression may aid in this identification.
16.5 Because of pesticide RT overlap and the potential for interfering substances, it is possible
that all of the identification criteria (Sections 16.1 - 16.4) may not be met. It is also
possible that loss of one or more chlorines from a highly chlorinated pesticide or interferent
may inflate or produce a false concentration for a less-chlorinated pesticide that elutes at
the same retention time (see Section 18). If identification is ambiguous, an experienced
spectrometrist (Section 1.5) must determine the presence or absence of the pesticide.
16.6 If the criteria for identification in Sections 16.1 - 16.5 are not met, the pesticide has not
been identified and the result for that pesticide may not be reported or used for permitting
or regulatory compliance purposes. If interferences preclude identification, a new aliquot
of sample must be extracted, further cleaned up, and analyzed.
17.0 Quantitative determination
17.1 Isotope dilution quantitation
17.1.1 By adding a known amount of the labeled pesticides to every sample prior to
extraction, correction for recovery of each pesticide can be made because the native
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Method 1699 December 2007
compound and its labeled analog exhibit similar effects upon extraction,
concentration, and gas chromatography. Relative responses (RRs) are used in
conjunction with the calibration data in Section 10.4 to determine concentrations in
the final extract, so long as labeled compound spiking levels are constant.
17.1 .2 Compute the concentrations of the pesticides in the extract using the RRs from the
calibration data (Section 10.4) and following equation:
Cex (ng/mL) =
Where:
Cex = The concentration of the pesticide in the extract, and the other
terms are as defined in Section 10.4.3
17.2 Internal standard quantitation and labeled compound recovery
1 7.2.1 Compute the concentrations in the extract of the native compounds that do not have
labeled analogs using the response factors determined from the calibration data
(Section 10.5) and the following equation:
Cex (ng/mL) =
(Alls+A2ls}RF
Where:
Cex = The concentration of the labeled compound in the extract, and the
other terms are as defined in Section 10.5.1
1 7.2.2 Using the concentration in the extract determined above, compute the percent
recovery of the labeled pesticides other labeled cleanup standard using the
following equation:
Recovery (%) = Concentration found (ng/mL) xlOO
Concentration spiked (ng/mL)
17.3 The concentration of a native compound in the solid phase of the sample is computed using
the concentration of the compound in the extract and the weight of the solids (Section
11.2.2.3), as follows:
Concentration in solid (ng/kg) = (Qr x ¥„)
Ws
Where:
Cex = The concentration of the compound in the extract.
Vex = The extract volume in mL.
Ws = The sample weight (dry weight) in kg.
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Method 1699 December 2007
17.4 The concentration of a native pesticide in the aqueous phase of the sample is computed
using the concentration of the compound in the extract and the volume of water extracted
(Section 11.4), as follows:
Concentration in aqueous phase (pg/L) = IQOOx (QrX ¥„)
Vs
Where:
Cex = The concentration of the compound in the extract.
V^ = The extract volume in mL.
Vs = The sample volume in liters.
17.5 If the SICP area at either quantitation m/z for any pesticide exceeds the calibration range of
the system, dilute the sample extract by the factor necessary to bring the concentration
within the calibration range, adjust the concentration of the Labeled injection internal
standard to 100 pg/^L in the extract, and analyze an aliquot of this diluted extract. If the
pesticides cannot be measured reliably by isotope dilution, dilute and analyze an aqueous
sample or analyze a smaller portion of a soil, tissue, or mixed-phase sample. Adjust the
pesticide concentrations, detection limits, and minimum levels to account for the dilution.
17.6 Reporting of re suits
17.6.1 Reporting units and levels
17.6.1.1 Aqueous samples - Report results in pg/L (parts-per-quadrillion).
17.6.1.2 Samples containing greater than 1% solids (soils, sediments, filter cake,
compost) - Report results in ng/kg based on the dry weight of the
sample. Report the percent solids so that the result may be converted to
aqueous units.
17.6.1.3 Tissues - Report results in ng/kg of wet tissue, not on the basis of the
lipid content of the tissue. Report the percent lipid content, so that the
data user can calculate the concentration on a lipid basis if desired.
17.6.2 Reporting level
17.6.2.1 Report the result for each pesticide in each sample, blank, or standard
(VER, IPR, OPR) at or above the minimum level of quantitation (ML;
Table 1) to 3 significant figures. Report the result below the ML in
each sample as
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Method 1699 December 2007
the samples and blank(s) separately, the concentration of each pesticide
in a method blank or field blank associated with the sample may be
subtracted from the results for that sample, or must be subtracted if
requested or required by a regulatory authority or in a permit.
17.6.2.3 Results for a pesticide in a sample that has been diluted are reported at
the least dilute level at which the area at the quantitation m/z is within
the calibration range (Section 17.5).
17.6.2.4 For a pesticide having a labeled analog, report results at the least dilute
level at which the area at the quantitation m/z is within the calibration
range (Section 17.5) and the labeled compound recovery is within the
normal range for the Method (Section 9.3 and Table 5).
17.6.2.5 Results from tests performed with an analytical system that is not in
control must not be reported or otherwise used for permitting or
regulatory compliance purposes, but do not relieve a discharger or
permittee of reporting timely results.
18.0 Analysis of complex samples
18.1 Some samples may contain high levels (>10 ng/L; >1000 ng/kg) of the compounds of
interest, interfering compounds, and/or polymeric materials. Some extracts may not
concentrate to 20 (iL (Section 12.7); others may overload the GC column and/or mass
spectrometer. A fragment ion from a pesticide at a higher level of chlorination may
interfere with determination of a pesticide at a lower level of chlorination.
18.2 Analyze a smaller aliquot of the sample (Section 17.5) when the extract will not
concentrate to 20 OL after all cleanup procedures have been exhausted. If a smaller aliquot
of soils or mixed-phase samples is analyzed, attempt to assure that the sample is
representative.
18.3 Perform integration of peak areas and calculate concentrations manually when interferences
preclude computerized calculations.
18.4 Recovery of labeled compounds - In most samples, recoveries of the labeled compounds
will be similar to those from reagent water or from the alternate matrix (Section 7.6).
18.4.1 If the recovery of any of the labeled compounds is outside of the normal range
(Table 5), a diluted sample must be analyzed (Section 17.5).
18.4.2 If the recovery of any of the labeled compounds in the diluted sample is outside of
normal range, the calibration verification standard (Section 7.10 and Table 5) must
be analyzed and calibration verified (Section 15.3).
18.4.3 If the calibration cannot be verified, a new calibration must be performed and the
original sample extract reanalyzed.
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Method 1699 December 2007
18.4.4 If calibration is verified and the diluted sample does not meet the limits for labeled
compound recovery, the Method does not apply to the sample being analyzed and
the result may not be reported or used for permitting or regulatory compliance
purposes. In this case, alternate extraction and cleanup procedures in this Method
or an alternate GC column must be employed to resolve the interference. If all
cleanup procedures in this Method and an alternate GC column have been
employed and labeled compound recovery remains outside of the normal range,
extraction and/or cleanup procedures that are beyond this scope of this Method will
be required to analyze the sample.
19.0 Pollution prevention
19.1 Pollution prevention encompasses any technique that reduces or eliminates the quantity or
toxicity of waste at the point of generation. Many opportunities for pollution prevention
exist in laboratory operation. 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 waste generation. When wastes cannot be reduced at the source, the
Agency recommends recycling as the next best option.
19.2 The pesticides in this Method are used in extremely small amounts and pose little threat to
the environment when managed properly. Standards should be prepared in volumes
consistent with laboratory use to minimize the disposal of excess volumes of expired
standards.
19.3 For information about pollution prevention that may be applied to laboratories and research
institutions, consult Less is Better: Laboratory Chemical Management for Waste
Reduction, available from the American Chemical Society's Department of Governmental
Relations and Science Policy, 1155 16th Street NW, Washington DC 20036, 202/872-4477
(http://membership.acs.0rg/c/ccs/pubs/less is better.pdf).
20.0 Waste management
20.1 The laboratory is responsible for complying with all Federal, State, and local regulations
governing waste management, particularly the hazardous waste identification rules and land
disposal restrictions, and to protect the air, water, and land by minimizing and controlling
all releases from fume hoods and bench operations. Compliance is also required with any
sewage discharge permits and regulations. An overview of requirements can be found in
Environmental Management Guide for Small Laboratories (EPA 233-B-98-001).
20.2 Samples containing HC1 or H2SO4 to pH <2, or KOH or NaOH to pH >12 must be handled
as hazardous waste, or must be neutralized before being poured down a drain.
20.3 The pesticides decompose above 800°C. Low-level waste such as absorbent paper, tissues,
animal remains, and plastic gloves may be burned in an appropriate incinerator. Gross
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Method 1699 December 2007
quantities (milligrams) should be packaged securely and disposed of through commercial or
governmental channels that are capable of handling extremely toxic wastes.
20.4 For further information on waste management, consult The Waste Management Manual for
Laboratory Personnel and 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 Street N.W., Washington, D.C. 20036.
21.0 Method performance
Method 1699 was validated and preliminary data were collected in a single laboratory (Reference
2). Single laboratory performance data are included in Table 8.
22.0 References
1 EPA Methods 608, 1656, 1613, and 1668A.
2 "Analytical Method for the Analysis of Multi-residue Pesticides in Aqueous and XAD
Column Samples by HRGC/HRMS," Axys Analytical Services (proprietary).
3 Lamparski, L.L., and Nestrick, T.J., "Novel Extraction Device for the Determination of
Chlorinated Dibenzo-p-dioxins (PCDDs) and Dibenzofurans (PCDFs) in Matrices
Containing Water," Chemosphere, 19:27-31, 1989.
4 "Working with Carcinogens," Department of Health, Education, & Welfare, Public Health
Service, Centers for Disease Control, NIOSH, Publication 77-206, August 1977, NTIS PB-
277256.
5 "OSHA Safety and Health Standards, General Industry," OSHA 2206, 29 CFR 1910.
6 "Safety in Academic Chemistry Laboratories," ACS Committee on Chemical Safety, 1979.
7 "Standard Methods for the Examination of Water and Wastewater," 18th edition and later
revisions, American Public Health Association, 1015 15th St, N.W., Washington, DC
20005, 1-35: Section 1090 (Safety), 1992.
8 "Method 613 - 2,3,7,8-Tetrachlorodibenzo-/?-dioxin," 40 CFR 136 (49 FR 43234),
December 26, 1984, Section 4.1.
9 Echols, Kathy, Robert Gale, Donald E. Tillitt, Ted Schwartz, and Jerome O'Laughlin,
Environmental Toxicology and Chemistry 16:8 1590-1597 (1997)
10 U.S. EPA Office of Superfund Remediation and Technology Innovation, Contract
Laboratory Program Summary of Requirements; Reporting and Deliverables Requirements;
Target Compound List and Contract Required Quantitation Limits; and Analytical Methods
(http://www.epa.gov/superfund/programs/clp/olm4.htm).
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Method 1699 December 2007
11 Provost, L.P., and Elder, R.S., "Interpretation of Percent Recovery Data," American
Laboratory, 15: 56-83, 1983.
12 "Standard Practice for Sampling Water," ASTM Annual Book of Standards, ASTM, 1916
Race Street, Philadelphia, PA 19103-1187, 1980.
13 e.g., "Standard Methods for the Examination of Water and Wastewater," 18th edition and
later revisions, American Public Health Association, 1015 15th St, N.W., Washington, DC
20005, Methods 4500-C1 adapted for field use.
14 "Handbook of Analytical Quality Control in Water and Wastewater Laboratories," USEPA
EMSL, Cincinnati, OH 45268, EPA-600/4-79-019, March 1979.
15 "Analytical Procedures and Quality Assurance Plan for the Determination of PCDD/PCDF
in Fish", U.S. Environmental Protection Agency, Environmental Research Laboratory,
Duluth MN 55804, EPA/600/3-90/022, March 1990.
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Method 1699
December 2007
23.0 Tables and Figures
Table 1. Names, CAS Registry numbers, and ambient water quality criteria for pesticides determined by
isotope dilution and internal standard HRGC/HRMS.
Pesticide
Organochlorine
Aldrin
BHC, alpha
BHC, beta
BHC, delta
BHC, gamma (lindane)
Captan
Chlordane, alpha (cis)
Chlordane, gamma (trans)
Chlorothalonil
Dacthal
ODD, o,p-
DDD, p,p-
DDE, o,p-
DDE, p,p-
DDT, o,p-
DDT, p,p-
Dieldrin
Endosulfan-alpha
Endosulfan-beta
Endosulfan-sulfate
Endrin
Endrin-ketone
Heptachlor
Heptachlor-epoxide
Hexachlorobenzene
Methoxychlor
Mi rex
Nonachlor, cis-
Nonachlor, trans-
Octachlorostyrene
Oxychlordane
Perthane
Quintozene
Tecnazene
CAS
Number
309-00-2
319-84-6
319-85-7
319-86-8
58-89-9
133-06-2
5103-71-9
5103-74-2
1897-45-6
1861-32-1
53-19-0
72-54-8
3424-82-6
72-55-9
789-02-6
50-29-3
60-57-1
959-98-8
33213-65-9
1031-07-8
72-20-8
53494-70-5
76-44-8
1024-57-3
118-74-1
72-43-5
2385-85-5
5103-73-1
39765-80-5
29082-74-4
27304-13-8
72-56-0
82-68-8
117-18-0
Labeled analog
13C12-Aldrin
13C6-BHC, alpha
13C6-BHC, beta
13C6-BHC, delta
13C6-BHC, gamma
13Cio-Chlordane, gamma
13C12-p,p-DDE
13C12-o,p-DDT
13C12-p,p-DDT
13C12-Dieldrin
13C9-alpha-Endosulfan
13C9-beta-Endosulfan
13C12-Endrin
13C4-Heptachlor
13C10-Heptachlor-epoxide
13C6-Hexachlorobenzene
13C12-Methoxychlor
13C8-Mirex
13C10-Nonachlor, cis-
13C10-Nonachlor, trans-
13C10-Oxychlordane
Lowest
Ambient
Criterion
(pg/L)(i)
49
2600
9100
160000
800
800
11
11
11
52
8700
8700
62000000
2300
79
40
30000
1000
MDLs and MLs, matrix and
concentration (2)
Water (pg/L)
MDL
6
7
6
5
9
182
7
6
35
4
3
5
3
6
2
1
5
24
30
13
3
12
7
12
4
7
35
4
11
12
7
36
18
22
ML
90
60
60
60
60
500
30
50
100
20
30
30
30
30
30
30
30
100
100
40
30
40
30
40
40
30
100
30
40
40
60
100
80
80
Solid
(ng/kg)
MD
L
0.6
1.3
0.6
2.0
0.7
35
0.6
0.8
1.9
0.9
0.8
1.5
0.5
0.7
0.3
0.3
0.5
-
-
11
0.4
1.6
-
0.3
1.9
0.3
-
0.5
0.8
1.1
0.5
-
4.7
3.2
ML
10
10
10
10
10
100
5
5
10
2
5
5
5
5
5
5
5
-
-
50
5
5
-
5
5
5
-
5
5
5
10
-
20
10
Extract
(pg/ML)
ML
3
3
3
3
3
25
1.5
2
5
1
1.5
1.5
1.5
1.5
1.5
1.5
1.5
5
5
2
1.5
2
1.5
2
2
1.5
5
1.5
2
2
3
5
4
4
68
-------
Method 1699
December 2007
Organophosphate
Azinphos-methyl
Chlorpyriphos
Chlorpyriphos-methyl
Chlorpyriphos-oxon
Diazinon
Diazinon-oxon
Disulfoton
Disulfoton sulfone
Fenitrothion
Fonofos
Malathion
Methamidophos
Parathion-ethyl
Parathion-methyl
Phorate
Phosmet
Pirimiphos-methyl
Triazine
Ametryn
Atrazine
Cyanazine
Desethyl atrazine
Hexazinone
Metribuzin
Simazine
Pyrethroid
Cypermethrin
Permethrins-peak 1
Permethrins-peak2
86-50-0
2921-88-2
5598-13-0
5598-15-2
333-41-5
962-58-3
298-04-4
2497 05 06
122-14-5
944-22-9
121-75-5
10265-92-6
56-38-2
298-00-0
298-02-2
732-11-6
29232-93-7
834-12-8
1912-24-9
21725-46-2
6190-65-4
51235-04-2
21087-64-9
122-34-9
52315-07-8
52645-53-1
52645-53-1
Azinphos-methyl-d6
Diazinon-d10
13C6-Fonofos
13C3-Atrazine
13C6-cis/trans-Permethrin3
13C6-cis/trans-Permethrin3
170000
100000
13000
57
20
19
24
27
22
64
9
24
11
296
269
15
39
49
63
14
11
14
38
5
20
14
12
66
59
44
200
80
100
80
80
80
400
30
80
80
1000
1000
80
200
200
200
80
80
80
80
40
100
60
80
200
200
100
1.4
2.0
3.0
3.5
24
-
7.1
1.6
4.6
0.8
41
-
3.5
6.1
3.5
12
7.3
13
-
-
1.3
1.0
-
1.4
2.4
230
340
20
10
10
10
100
-
100
5
20
8
200
-
10
20
20
50
20
50
-
-
5
10
-
10
20
1000
1000
10
4
5
4
4
4
20
1.5
4
4
50
50
4
10
10
10
4
4
4
4
2
5
3
4
10
10
5
1. National Recommended Water Quality Criteria, 2004, http://epa.gov/waterscience/criteria/wqcriteria.html. and
Great Lakes Criteria (40 CFR 132.6), whichever is lower. A blank cell means there is no ambient criterion.
2. Method detection limits (MDLs) and minimum levels of quantitation (MLs) with no interferences present.
3. Elution order of cis/trans permethrin unknown
69
-------
Method 1699
December 2007
Table 2. Retention times (RTs); relative retention times (RRTs); and retention time and
quantitation references for the pesticides
Pesticide
Methamidophos
Tecnazene
njC6-Hexachlorobenzene
Hexachlorobenzene
Phorate
BHC-alpha
Desethylatrazine
Diazinon-d10
Quintozene
Diazinon
Diazinon-oxon
1JC3-Atrazine
Atrazine
njC6-gamma-BHC
gamma-BHC
Simazine
Fonofos
1JC6-Fonofos
Disulfoton
1JC6-beta-BHC
beta-BHC
1JC4-Heptachlor
Heptachlor
1JC6-delta-BHC
delta-BCH
Chlorothalonil.
lJC12-Aldrin
Aldrin
Chlorpyriphos-methyl
lJC12-PCB-52
Parathion-methyl
Ametryn
Pirimiphos-methyl
Metribuzin
Octachlorostyrene
Dacthal
Chlorpyriphos
Fenitrothion
njCio-Oxychlordane
Oxychlordane
Malathion
Heptachlor-epoxide
njC-Permethrins-Peak 2
Parathion-ethyl
Chlorpyriphos-oxon
njC6-Permethrins-Peak 1
Azinphos-ethyl-d6
njC12-Heptachlor-epoxide
RT(1)
09:01
14:44
15:54
15:55
16:11
16:35
16:50
17:32
17:39
17:44
17:55
18:00
18:01
18:15
18:16
18:21
18:25
18:25
18:34
19:26
19:27
19:36
19:37
21:00
21:01
21:08
21:15
21:17
21:26
21:51
22:28
22:41
22:42
23:04
23:18
23:18
23:33
24:07
24:09
24:11
24:12
25:14
42:21
24:26
24:30
42:04
24:33
25:11
RRT
(2)
0.413
0.927
0.728
1.001
0.741
0.909
0.935
0.802
1.110
1.011
1.022
0.824
1.001
0.835
1.001
1.019
1.000
0.843
0.850
0.889
1.001
0.897
1.001
0.961
1.001
0.967
0.973
1.002
0.981
N/A
1.028
1.038
1.039
1.056
1.096
1.066
1.078
1.104
1.105
1.001
1.108
0.962
1.114
1.118
1.121
1.124
1.124
1.153
RRT Limits
(3)
0.397-0.428
0.906-0.948
0.712-0.743
0.991 -1.012
0.725-0.756
0.890-0.927
0.917-0.954
0.787-0.818
1.089-1.131
1.002-1.021
1.003-1.041
0.809-0.839
0.992-1.010
0.820-0.850
0.992-1.010
1.001 -1.038
0.991 -1.009
0.828-0.858
0.834-0.865
0.874-0.905
0.992-1.009
0.882-0.912
0.992-1.009
0.946-0.976
0.993-1.009
0.952-0.982
0.957-0.988
0.994-1.009
0.966-0.996
N/A
1.013-1.043
1.023-1.053
1.024-1.054
1.040-1.071
1.081 -1.112
1.051 -1.082
1.063-1.093
1.088-1.119
1.090-1.121
0.994-1.008
1.092-1.123
0.956-0.969
1.099-1.130
1.103-1.133
1.106-1.137
1.108-1.139
1.108-1.139
1.137-1.168
Retention time and
quantitation reference (4)
lJC12-PCB-52
13C6-HCB
lJC12-PCB-52
1JC6-HCB
lJC12-PCB-52
1JC6-gamma-BHC
njC3-Atrazine
lJC12-PCB-52
1JC6-HCB
Diazinon-d10
Diazinon-d10
lJC12-PCB-52
1JC3-Atrazine
lJC12-PCB-52
njC6-gamma-BHC
njC3-Atrazine
1JC6-Fonofos
lJC12-PCB-52
lJC12-PCB-52
lJC12-PCB-52
1JC6-beta-BHC
lJC12-PCB-52
1JC4-Heptachlor
lJC12-PCB-52
1JC6-delta-BHC
lJC12-PCB-52
lJC12-PCB-52
lJC12-Aldrin
lJC12-PCB-52
N/A
lJC12-PCB-52
lJC12-PCB-52
lJC12-PCB-52
lJC12-PCB-52
1JCi2-Aldrin
lJC12-PCB-52
lJC12-PCB-52
lJC12-PCB-52
lJC12-PCB-52
lJC10-Oxychlordane
lJC12-PCB-52
lJC12-Heptachlor-epoxide
lJC12-PCB-52
lJC12-PCB-52
lJC12-PCB-52
lJC12-PCB-52
lJC12-PCB-52
lJC12-PCB-52
Quant Ref RT
21:51
15:54
21:51
15:54
21:51
18:15
18:00
21:51
15:54
17:32
17:32
21:51
18:00
21:51
18:15
18:00
18:25
21:51
21:51
21:51
19:26
21:51
19:36
21:51
21:00
21:51
21:51
21:15
21:51
N/A
21:51
21:51
21:51
21:51
21:15
21:51
21:51
21:51
21:51
24:09
21:51
25:11
21:51
21:51
21:51
21:51
21:51
21:51
70
-------
Method 1699
December 2007
lJC10-t-Chlordane
t-Chlordane
lJC10-t-Nonachlor
t-Nonachlor
c-Chlordane
njC9-alpha-Endosulfan
Alpha-Endosulfan
o.p-DDE
Cyanazine
njC12-Dieldrin
Dieldrin
p.p-DDE
Captan
o.p-DDD
njC12-p,p-DDE
Disulfoton-Sulfone.
njC12-Endrin
Endrin
Perthane
lJC10-c-Nonachlor
c-Nonachlor
lJC12-o,p-DDT
o.p-DDT
1JC9-beta-Endosulfan
p.p-DDD
beta-Endosulfan
p.p-DDT
Endosulfan-sulfate
njC8-Mirex
Mi rex
Hexazinone
njC12-Methoxychlor
Methoxychlor
Endrin-Ketone
lJC12-p,p-DDT
Phosmet
Permethrins-Peak 1
Permethrins-Peak 2
Azinphos-methyl
Cypermethrins-Peak 1
Cypermethrins-Peak 2
Cypermethrins-Peak 3
26:39
26:41
26:48
26:50
27:44
27:51
27:53
28:07
28:13
30:31
30:34
30:38
31:26
32:21
30:36
32:49
32:53
32:56
32:58
33:17
33:19
33:58
33:59
34:30
34:31
34:32
35:54
36:54
39:29
39:30
39:38
39:43
39:44
39:47
35:53
40:55
42:04
42:21
42:39
43:52
44:03
44:11
1.220
1.001
1.227
1.001
1.041
1.275
1.001
0.862
1.291
1.397
1.002
0.940
1.439
0.952
1.492
1.502
1.505
1.002
1.509
1.523
1.001
1.555
1.000
1.579
0.865
1.001
0.900
1.070
1.807
1.000
1.814
1.818
1.000
1.210
1.825
1.873
1.714
1.739
1.737
N/A
N/A
N/A
1.204-1.235
0.995-1.008
1.211 -1.242
0.995-1.007
1.028-1.053
1.259-1.290
0.995-1.007
0.852-0.873
1.276-1.307
1.381 -1.412
0.996-1.007
0.935-0.945
1.423-1.454
0.943-0.962
1.477-1.507
1.487-1.517
1.490-1.520
0.996-1.007
1.494-1.524
1.508-1.539
0.996-1.006
1.539-1.570
0.996-1.005
1.564-1.594
0.857-0.874
0.996-1.006
0.896-0.904
1.060-1.079
1.792-1.822
0.996-1.005
1.799-1.829
1.802-1.833
0.996-1.005
1.200-1.220
1.810-1.841
1.857-1.888
1.707-1.72
1.732-1.746
1.730-1.744
N/A
N/A
N/A
lJC12-PCB-52
lJC10-t-Chlordane
lJC12-PCB-52
lJC10-t-Nonachlor
lJC10-t-Chlordane
lJC12-PCB-52
1JCg-alpha-Endosulfan
lJC12-p,p-DDE
lJC12-PCB-52
lJC12-PCB-52
lJC12-Dieldrin
lJC12-p,p-DDE
lJC12-PCB-52
lJC12-o,p-DDT
lJC12-PCB-52
lJC12-PCB-52
lJC12-PCB-52
lJC12-Endrin
lJC12-PCB-52
lJC12-PCB-52
lJC10-c-Nonachlor
lJC12-PCB-52
1JC-o,p-DDT
lJC12-PCB-52
"C12-p,p-DDT
njCg-beta-Endosulfan
"C12-p,p-DDT
njCg-beta-Endosulfan
lJC12-PCB-52
1JC8-Mirex
lJC12-PCB-52
lJC12-PCB-52
lJC12-Methoxychlor
lJC12-Endrin
lJC12-PCB-52
lJC12-PCB-52
1JC6-Permethrins-Peak 1
njC6-Permethrins-Peak 2
Azinphos-methyl-d6
njC6-Permethrins-Peak 1+2
njC6-Permethrins-Peak 1+2
njC6-Permethrins-Peak 1+2
21:51
26:39
21:51
26:48
26:39
21:51
27:51
30:36
21:51
21:51
30:31
30:36
21:51
33:58
21:51
21:51
21:51
32:53
21:51
21:51
33:17
21:51
33:58
21:51
35:53
34:30
35:53
34:30
21:51
39:29
21:51
21:51
39:43
32:53
21:51
21:51
42:04
42:21
42:33
1 . Retention time of pesticide or labeled compound.
2. Relative retention time (RRT) between the target and reference compounds.
3 . RRT limits based on estimated RRT variability.
4. Labeled compounds that form both the retention time and quantitation reference.
5. Method detection limits (MDLs) and minimum levels of quantitation (MLs) with no interferences present.
71
-------
Method 1699
December 2007
Table 3. Concentrations of native and labeled pesticides in stock solutions, spiking solutions, and final
extracts
Pesticide
Tecnazene
Hexachlorobenzene
Quintozene
Heptachlor
Alpha-BHC
gamma-BHC (Lindane)
beta-BHC
delta-BHC
Aldrin
Dacthal
Octachlorostyrene
Oxychlordane
Heptachlor epoxide B
Trans-Chlordane
cis-Chlordane
Trans-Nonachlor
cis-Nonachlor
Endosulfan 1 (alpha)
Endosulfan II (beta)
Dieldrin
2,4'-DDD
4,4'-DDD
2,4'-DDE
4,4'-DDE
2,4'-DDT
4,4'-DDT
Perthane
Endrin
Endosulfan sulfate
Mi rex
Methoxychlor
Endrin ketone
Desethylatrazine
Simazine
Atrazine
Ametryn
Metribuzin
Cyanazine
Hexazinone
Stock
(ng/mL)
800
800
1600
600
1200
1200
1200
1200
1200
400
600
1200
600
600
600
800
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
800
1600
1600
1600
400
1600
2000
Spiking
solution
(pg/mL)
800
800
1600
600
1200
1200
1200
1200
1200
400
600
1200
600
600
600
800
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
800
1600
1600
1600
400
1600
2000
In 20 (jL extract
(ng/mL; pg/HL)
40
40
80
30
60
60
60
60
60
20
30
60
30
30
30
40
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
40
80
80
80
20
80
100
72
-------
Method 1699
December 2007
Permethrin
Cypermethrin
Chlorothalonil
Diazinon
Disulfoton
Phorate
Methamidophos
Diazinon-oxon
Fonofos
Chlorpyriphos-methyl
Parathion-methyl
Pirimphos-methyl
Chlorpyriphos
Fenitrothion
Malathion
Parathion-ethyl
Chlorpyriphos-oxon
Disulfoton sulfone
Azinphos-methyl
Captan
Phosmet (Imidan)
13C6-HCB
13C6-gamma-BHC
13C4-Heptachlor
13C6-beta-BHC
13C6-delta-BHC
13C12-Aldrin
13C10-Oxychlordane
13C10-Heptachlor-epoxide
13C9-alpha-Endosulfan
13C12-Dieldrin
13C10-t-Chlordane
13C10-t-Nonachlor
13C12-p,p-DDE
13C12-Endrin
13C9-beta-Endosulfan
13C10-c-Nonachlor
13C12-o,p-DDT
13C12-p,p-DDT
13C8-Mirex
13C12-Methoxychlor
Azinphos-methyl-d6
Diazinon-d10
13C6-Fonofos
800
4000
800
1600
8000
1600
1600
1600
1600
2000
4000
1600
1600
1600
20000
1600
1600
400
2000
4000
4000
1800
2600
1400
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
800
4000
800
1600
8000
1600
1600
1600
1600
2000
4000
1600
1600
1600
20000
1600
1600
400
2000
4000
4000
1800
2600
1400
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
1600
40
200
40
80
400
80
80
80
80
100
200
80
80
80
1000
80
80
20
100
200
200
90
130
70
80
80
80
80
80
80
80
80
80
80
80
80
80
80
80
80
80
80
80
80
73
-------
Method 1699
December 2007
13C3-Atrazine
13C6-Permethrins
13C12PCB52
1600
1600
1600
1600
1600
1600
80
80
80
74
-------
Method 1699
December 2007
Table 4. Concentration of pesticides in calibration and calibration verification standards (ng/mL)
Solution concentration (ng/mL)
Pesticide
Tecnazene
Hexachlorobenzene
Quintozene
Heptachlor
alpha-BHC
gamma-BHC (Lindane)
beta-BHC
delta-BHC
Aldrin
Dacthal
Octachlorostyrene
Oxychlordane
Heptachlor epoxide
trans-Chlordane
cis-Chlordane
trans-Nonachlor
cis-Nonachlor
Endosulfan 1 (alpha)
Endosulfan II (beta)
Dieldrin
2,4'-DDD
4,4'-DDD
2,4-DDE
4,4-DDE
2,4-DDT
4,4-DDT
Perthane
Endrin
Endosulfan sulfate
Mi rex
Methoxychlor
Endrin ketone
Desethylatrazine
Simazine
Atrazine
Ametryn
Metribuzin
Cyanazine
Hexazinone
Permethrin
CS-1 (Hi
sens) (1)
2.0
2.0
4.0
1.5
3.0
3.0
3.0
3.0
3.0
1.0
1.5
3.0
1.5
1.5
1.5
2.0
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
2.0
4.0
4.0
4.0
1.0
4.0
5.0
2.0
CS-2
8.0
8.0
16.0
6.0
12.0
12.0
12.0
12.0
12.0
4.0
6.0
12.0
6.0
6.0
6.0
8.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
8.0
16.0
16.0
16.0
4.0
16.0
20.0
8.0
CS-3
16.0
16.0
32.0
12.0
24.0
24.0
24.0
24.0
24.0
8.0
12.0
24.0
12.0
12.0
12.0
16.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
16.0
32.0
32.0
32.0
8.0
32.0
40.0
16.0
CS-4
(VER)
40.0
40.0
80.0
30.0
60.0
60.0
60.0
60.0
60.0
20.0
30.0
60.0
30.0
30.0
30.0
40.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
40.0
80.0
80.0
80.0
20.0
80.0
100.0
40.0
CS-5
100.0
100.0
200.0
75.0
150.0
150.0
150.0
150.0
150.0
50.0
75.0
150.0
75.0
75.0
75.0
100.0
75.0
75.0
75.0
75.0
75.0
75.0
75.0
75.0
75.0
75.0
75.0
75.0
75.0
75.0
75.0
75.0
100.0
200.0
200.0
200.0
50.0
200.0
250.0
100.0
CS-6
200.0
200.0
400.0
150.0
300.0
300.0
300.0
300.0
300.0
100.0
150.0
300.0
150.0
150.0
150.0
200.0
150.0
150.0
150.0
150.0
150.0
150.0
150.0
150.0
150.0
150.0
150.0
150.0
150.0
150.0
150.0
150.0
200.0
400.0
400.0
400.0
100.0
400.0
500.0
200.0
75
-------
Method 1699
December 2007
Cypermethrin
Chlorothalonil
Diazinon
Disulfoton
Phorate
Methamidophos (Monitor)
Diazinon-oxon
Fonofos (Dyfonate)
Chlorpyriphos-methyl
Parathion-methyl
Pirimphos-methyl
Chlorpyriphos (Dursban)
Fenitrothion
Malathion
Parathion-ethyl (Parathion)
Chlorpyriphos-oxon
Disulfoton sulfone
Azinphos-methyl
Captan
Phosmet (Imidan)
13C6-HCB
13C6-gamma-BHC
13C4-Heptachlor
13C6-beta-BHC
13C6-delta-BHC
13C12-Aldrin
13C10-Oxychlordane
13C10-Heptachlor-epoxide
13C9-alpha-Endosulfan
13C12-Dieldrin
13C10-t-Chlordane
13C10-t-Nonachlor
13C12-p,p-DDE
13C12-Endrin
13C9-beta-Endosulfan
13C10-c-Nonachlor
13C12-o,p-DDT
13C12-p,p-DDT
13C8-Mirex
13C12-Methoxychlor
Azinphos-methyl-d6
Diazinon-d10
13C6-Fonofos
13C3-Atrazine
10.0
2.0
4.0
20.0
4.0
4.0
4.0
4.0
5.0
10.0
4.0
4.0
4.0
50.0
4.0
4.0
1.0
5.0
10.0
10.0
90.0
130.0
70.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
40.0
8.0
16.0
80.0
16.0
16.0
16.0
16.0
20.0
40.0
16.0
16.0
16.0
200.0
16.0
16.0
4.0
20.0
40.0
40.0
90.0
130.0
70.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
16.0
32.0
160.0
32.0
32.0
32.0
32.0
40.0
80.0
32.0
32.0
32.0
400.0
32.0
32.0
8.0
40.0
80.0
80.0
90.0
130.0
70.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
200.0
40.0
80.0
400.0
80.0
80.0
80.0
80.0
100.0
200.0
80.0
80.0
80.0
1000.0
80.0
80.0
20.0
100.0
200.0
200.0
90.0
130.0
70.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
500.0
100.0
200.0
1000.0
200.0
200.0
200.0
200.0
250.0
500.0
200.0
200.0
200.0
2500.0
200.0
200.0
50.0
250.0
500.0
500.0
90.0
130.0
70.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
1000.0
200.0
400.0
2000.0
400.0
400.0
400.0
400.0
500.0
1000.0
400.0
400.0
400.0
5000.0
400.0
400.0
100.0
500.0
1000.0
1000.0
100.0
150.0
100.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
76
-------
Method 1699
December 2007
13C6-Permethrins
13C12PCB52
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
80.0
1. Additional concentration used for calibration of high sensitivity HRGC/HRMS systems
77
-------
Method 1699
December 2007
Table 5. QC acceptance criteria for pesticides in VER, IPR, OPR, and samples1
Pesticide (1) (2)
13C12-Aldrin
13C3-Atrazine
13C6-beta-BHC
13C10-c-Nonachlor
13C6-delta-BHC
13C12-Dieldrin
13C6-Fonofos
13C6-gamma-BHC
13C6-Hexachlorobenzene
13C4-Heptachlor
13C10-Heptachlor-epoxide
13C8-Mirex
13C12-o,p-DDT
13C10-Oxychlordane
13C12-p,p-DDE
13C12-p,p-DDT
13C6-Permethrin-Peak 1
13C6-Permethrin-Peak 2
13C10-T-Chlordane
13C10-T-Nonachlor
13C12-Endrin
13C12-Methoxychlor
13C9-alpha-Endosulfan
13C9-beta-Endosulfan
Diazinon-d10
Azinphos-methyl-d6
o,p'-DDD
o,p'-DDE
o,p'-DDT
p,p'-DDD
p,p'-DDE
p,p'-DDT
Aldrin
Alpha-Endosulfan
beta-Endosulfan
Disulfoton
alpha-BHC
Ametryn
Atrazine
Azinphos-methyl
VER (%)
(3)
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
70-130
75-125
70-130
75-125
75-125
75 - 125
75-125
75-125
75 - 125
75 - 125
75 - 125
75-125
75-125
75 - 125
75-125
75-125
75-125
IPR Rec.
Limits %
(4)
6-113
20-133
19-127
18-139
18-135
21 -145
6-108
6-112
6-108
6-115
9-131
6-125
16-180
6-129
29-152
15-180
35-180
35-180
17-130
15-134
22-141
8-180
6-130
6-108
6-130
6-180
55-108
26 - 1 1 1
55-108
47-108
55-108
55-108
55-108
55-108
5-200
5-200
55-108
6-160
55-108
55-108
IPR RSD
Max
75
45
46
47
47
46
63
62
70
67
52
56
51
54
43
52
43
43
47
49
45
54
63
59
54
57
30
30
30
30
30
30
30
30
50
50
30
52
30
30
OPR Rec.
limits (%)
(5)
5-126
18-147
17-141
17-154
16-150
19-161
5-120
5-124
5-120
5-128
8-146
5-138
14-200
5-144
26-169
13-200
32 - 200
31 -200
15-144
13-149
20-157
8-200
5-144
5-120
5-145
5-200
50-120
24-123
50-120
42-120
50-120
50-120
50-120
50-120
5-200
5-200
50-120
5-178
50-120
50-120
Recovery in
samples
(%) (6)
5-120
36-132
32-130
36-139
36-137
40-151
5-132
11 -120
5-120
5-120
27-137
5-120
5-199
23-135
47-160
5-120
35-189
31 -192
21 -132
14-136
35-155
5-120
15-148
5-122
21 -141
20-179
78
-------
Method 1699
December 2007
beta-BHC
c-Chlordane
c-Nonachlor
Captan
Chlorothalonil
Chlorpyrifos
Chlorpyrifos-methyl
Chlorpyrifos-oxon
Octachlorostyrene
Cyanazine
Dacthal
delta-BHC
Desethylatrazine
Diazinon
Diazinon-oxon
Dieldrin
Disulfoton sulfone
Endosulfan-sulfate
Endrin
Endrin-ketone
Fenitrothion
Fonofos
Gamma-BHC
Hexachlorobenzene
Heptachlor
Heptachlor-epoxide
Hexazinone
Malathion
Methamidophos
Methoxychlor
Metribuzin
Mi rex
Oxychlordane
Parathion-ethyl
Parathion-methyl
Perthane
Phorate
Phosmet
Pirimiphos-methyl
Quintozene
Simazine
t-Chlordane
t-Nonachlor
Technazene
75 - 125
75 - 125
75 - 125
75 - 125
75 - 125
75 - 125
75-125
75 - 125
70-130
75-125
75 - 125
75-125
75-125
75 - 125
75-125
75 - 125
75-125
75-125
75 - 125
75-125
75-125
75 - 125
75-125
75-125
75 - 125
75 - 125
75-125
75 - 125
75-125
75 - 125
75-125
75 - 125
75-125
75-125
75-125
75 - 125
75-125
75 - 125
75-125
75 - 125
75 - 125
75 - 125
75-125
75 - 125
55-108
55-108
55-108
6-108
6-108
21 -147
10-130
6-143
55-158
10-176
18-129
55-108
55-108
55-108
55-144
55-108
6-180
55-180
55-108
55-120
15-168
55-108
55-108
55-108
55-108
55-108
6-154
15-136
6-108
55-108
6-134
55-108
55-108
13-147
7-136
26-180
6-108
14-138
6-151
55-180
55-108
55-108
55-108
55-154
30
30
30
39
47
46
51
43
30
53
46
30
30
30
30
30
79
30
30
30
50
30
30
30
30
30
74
48
68
30
58
30
30
50
53
46
291
49
64
30
30
30
30
30
50-120
50-120
50-120
5-120
5-120
19-163
9-145
5-158
50-175
9-195
16-143
50-120
50-120
50-120
50-160
50-120
5-200
50 - 200
50-120
50-134
14-186
50-120
50-120
50-120
50-120
50-120
5-171
14-151
5-120
50-120
5-149
50-120
50-120
12-164
7-151
24 - 200
5-120
13-153
5-168
50 - 200
50-120
50-120
50-120
50-171
79
-------
Method 1699
December 2007
Total-Cypermethrins
Total-Permethrins
75-125
75-125
55-108
55-180
30
30
50-120
50 - 200
1. QC acceptance criteria for IPR, OPR, and samples based on a 20 uL extract final volume
2. For concentrations see Table 3 spike solutions.
3. Section 15.3.
4. Section 9.2.
5. Section 15.6.
6. Section 9.3: Recovery of labeled compounds from samples.
80
-------
Method 1699
December 2007
Table 6. Scan functions; exact m/z's (ml and m2), ratios and tolerances; retention times (RTs); and
quantitation references.
Func
-tion
1
2
2
2
2
3
3
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
5
5
5
5
6
6
6
6
6
6
7
7
7
7
Pesticide
Methamidophos
HCB
Tecnazene
13C6-HCB
Phorate
Desethylatrazine
Alpha-HCH
Atrazine
Simazine
Fonofos
gamma-HCH
Quintozene
13C3-Atrazine
13C6-Fonofos
13C6-gamma-BHC
Diazinon-d10
Disulfoton
Diazinon
Diazinon-oxon
Aldrin
Beta-BHC
Delta-BHC
Heptachlor
13C12-Aldrin
13C6-beta-BHC
13C6-delta-BHC
13C4-Heptachlor
Chlorothalonil.
Chlorpyriphos-methyl
13C12-PCB-52
Octachlorostyrene
Ametryn
Dacthal
Metribuzin
Parathion-methyl
Pirimiphos-methyl
Oxychlordane
13C10-Oxychlordane
Chlorpyriphos
Chlorpyriphos-oxon
m1(1)
93.9642
283.8102
258.8761
289.8303
260.0128
172.0390
218.9116
215.0938
201.0781
246.0302
218.9116
236.8413
218.1038
252.0503
222.9346
282.1074
274.0285
276.0698
273.1004
262.8569
218.9116
218.9116
271.8102
269.8804
222.9346
222.9346
276.8269
263.8816
285.9261
301.9626
270.8443
227.1205
298.8836
198.0701
263.0017
276.0572
262.8569
269.8804
313.9574
269.9490
m2(1)
94.9721
285.8072
260.8732
291.8273
262.0086
174.0360
220.9086
217.0908
203.0752
247.0336
220.9086
238.8384
220.1009
253.0537
224.9317
314.1638
275.0318
304.1011
288.1239
264.854
220.9086
220.9086
273.8072
271.8775
224.9317
224.9317
278.824
265.8786
287.9232
303.9597
272.8413
228.1238
300.8807
199.0735
264.0051
290.0728
264.8540
271.8775
315.9545
271.9462
m1/m2
Ratio
1.25
0.78
1.25
6.92
3.11
2.08
3.08
3.1
2.08
1.56
3.08
1000
0.77
1000
1.56
2.08
2.08
1.25
1.56
0.77
0.77
1.24
0.78
1.44
0.78
0.63
0.78
1.56
1.56
1.44
1.54
Tolerance (+/-)
0.35
0.25
0.35
0.25
0.35
0.35
0.25
0.35
0.35
0.35
0.25
0.35
0.35
0.35
0.25
0.35
0.35
0.35
0.35
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.35
0.35
0.25
0.25
0.35
0.35
0.35
0.35
0.35
0.25
0.25
0.35
0.35
RT
(min)
09:01
15:55
14:44
15:54
16:11
16:50
16:35
18:01
18:21
18:25
18:16
17:39
18:00
18:25
18:15
17:32
18:34
17:44
17:55
21:17
19:27
21:01
19:37
21:15
19:26
21:00
19:36
21:08
21:26
21:51
23:18
22:41
23:18
23:04
22:28
22:42
24:11
24:09
23:33
24:30
Quantified against
labeled standard
13C12-PCB-52
13C6-HCB
13C6-HCB
13C12-PCB-52
13C12-PCB-52
13C3-Atrazine
13C6-gamma-BHC
13C3-Atrazine
13C3-Atrazine
13C6-Fonofos
13C6-gamma-BHC
13C6-HCB
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
Diazinon-d10
Diazinon-d10
13C12-Aldrin
13C6-beta-BHC
13C6-delta-BHC
13C4-Heptachlor
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-Aldrin
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C10-Oxychlordane
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
81
-------
Method 1699
December 2007
1
1
1
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
9
9
9
9
9
9
9
10
10
10
10
10
10
10
10
10
11
11
11
11
11
11
11
11
11
11
Fenitrothion
Malathion
Parathion-ethyl
Heptachlor-epoxide
alpha-Endosulfan
Dieldrin
o.p-DDE
p.p-DDE
13C12-Heptachlor-epoxide
13C9-alpha-Endosulfan
13C12-Dieldrin
13C12-p,p-DDE
13C10-t-Chlordane
13C10-t-Nonachlor
Cyanazine
c-Chlordane
t-Chlordane
t-Nonachlor
Endrin
c-Nonachlor
o.p-DDD
13C12-Endrin
Captan
Disulfoton-Sulfone.
Perthane
beta-Endosulfan
Endosulfan-sulfate
o.p-DDT
p.p-DDD
p.p-DDT
13C9-beta-Endosulfan
13C10-c-Nonachlor
13C12-o,p-DDT
13C12-p,p-DDT
Endrin-ketone
Methoxychlor
Mi rex
13C12-Methoxychlor
13C8-Mirex
13C6-Permethrins-Peak 1
13C6-Permethrins-Peak_2
Azinphos-methyl-d6
Hexazinone
Phosmet
260.0146
283.9942
291.0330
262.8569
262.8569
262.8569
246.0003
246.0003
269.8804
269.8804
269.8804
258.0406
269.8804
269.8804
240.0890
262.8569
262.8569
262.8569
262.8569
262.8569
235.0081
269.8804
263.9653
213.0173
224.1520
264.8540
264.8540
235.0081
235.0081
235.0081
269.8804
269.8804
247.0484
247.0484
247.8521
227.1072
236.8413
239.1475
241.8581
189.1011
189.1011
160.0511
171.0882
160.0399
277.0174
285.0020
292.0364
264.8540
264.8540
264.8540
247.9974
247.9974
271.8775
271.8775
271.8775
260.0376
271.8775
271.8775
242.0861
264.854
264.854
264.854
264.854
264.854
237.0052
271.8775
265.9623
214.0251
223.1487
262.8569
262.8569
237.0052
237.0052
237.0052
271.8775
271.8775
249.0454
249.0454
249.8491
228.1106
238.8384
240.1508
243.8551
190.1045
190.1045
161.0544
172.0916
161.0432
1.56
1.56
1.56
1.56
1.56
1.56
1.56
1.56
1.56
1.56
1.56
3.06
1.56
1.56
1.56
1.56
1.56
1.56
1.56
1.44
0.64
0.64
1.56
1.56
1.56
1.56
1.56
1.56
1.56
0.63
1.56
1.56
0.35
0.35
0.35
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.35
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.35
0.35
0.35
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.35
0.25
0.35
0.25
0.35
0.35
0.35
0.35
0.35
24:07
24:12
24:26
24:14
27:53
30:34
28:07
30:38
25:11
27:51
30:31
32:36
26:39
26:48
28:13
27:44
26:41
26:50
32:56
33:19
32:21
32:53
31:26
32:49
32:58
34:32
36:54
33:59
34:31
35:54
34:30
33:17
33:58
39:53
39:47
39:44
39:30
39:43
39:29
24:33
24:21
24:33
39:38
40:55
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-Heptachlor-epoxide
1 3C9-alpha-Endosulfan
13C12-Dieldrin
13C12-p,p-DDE
13C12-p,p-DDE
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C10-t-Chlordane
13C10-t-Chlordane
13C10-t-Nonachlor
13C12-Endrin
13C10-c-Nonachlor
13C12-o,p-DDT
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C9-beta-Endosulfan
13C9-beta-Endosulfan
13C12-o,p-DDT
13C12-p,p-DDT
13C12-p,p-DDT
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-Endrin
13C12-Methoxychlor
13C8-Mirex
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
13C12-PCB-52
82
-------
Method 1699
December 2007
11
11
11
11
11
11
11
11
Permethrins-Peak_1
Cypermethrins-Peak_1
Cypermethrins-Peak_2
Cypermethrins-Peak_3
Permethrins-Peak_2
Azinphos-methyl
Total-Cypermethrins
Total-Permethrins
183.0081
163.0081
163.0081
163.0081
183.0081
160.0511
163.0081
183.0081
184.0843
165.0052
165.0052
165.0052
184.0843
161.0544
165.0052
184.0843
1.56
1.56
1.56
1.56
0.35
0.35
0.35
0.35
0.35
0.35
0.35
0.35
42:04
43:52
44:03
44:11
42:21
42:39
1 3C6-Permethrins-Peak_1
1 3C6-Permethrins-Peak_1 +2
1 3C6-Permethrins-Peak_1 +2
1 3C6-Permethrins-Peak_1 +2
1 3C6-Permethrins-Peak_2
Azinphos-methyl-d6
1. Isotopic masses used for accurate mass calculation
'H
12C
13C
35C1
37C1
19F
14N
16Q
1.0078
12.0000
13.0034
34.9689
36.9659
18.9984
14.0031
15.9949
83
-------
Method 1699
December 2007
Table 7. Suggested sample quantities to be extracted for various matrices'
Sample matrix2
Example
Percent
solids
Phase
Quantity
extracted
Single-phase
Aqueous
Solid
Organic
Tissue
Drinking water
Groundwater
Treated wastewater
Dry soil
Compost
Ash
Waste solvent
Waste oil
Organic polymer
Fish
Human adipose
<1
>20
<1
3
Solid
Organic
Organic
1000 mL
10 g
10 g
10 g
Multi-phase
Liquid/Solid
Aqueous/Solid
Organic/solid
Wet soil
Untreated effluent
Digested municipal sludge
Filter cake
Paper pulp
Industrial sludge
Oily waste
1-30
1-100
Solid
Both
10 g
10 g
Liquid/Liquid
Aqueous/organic
Aqueous/organic/solid
In-process effluent
Untreated effluent
Drum waste
Untreated effluent
Drum waste
<1
>1
Organic
Organic & solid
10 g
10 g
1 . The quantity of sample to be extracted is adjusted to provide 10 g of solids (dry weight). One liter of aqueous
samples containing one percent solids will contain 10 grams of solids. For aqueous samples containing greater
than one percent solids, a lesser volume is used so that 10 grams of solids (dry weight) will be extracted.
2. The sample matrix may be amorphous for some samples. In general, when the pesticides are in contact with a
multi-phase system in which one of the phases is water, they will be preferentially dispersed in or adsorbed on
the alternate phase because of their low water solubility.
84
-------
Method 1699
December 2007
3. Aqueous samples are filtered after spiking with the labeled compounds. The filtrate and the materials trapped
on the filter are extracted separately, and the extracts are combined for cleanup and analysis.
Table 8. Performance data from single laboratory validation.
13C12-ENDRIN
13C12-METHOXYCHLOR
13C9-ALPHA-
ENDOSULPHAN
13C9-BETA-
ENDOSULPHAN
13C-ALDRIN
13C-ATRAZINE
13C-BETA-HCH
13C-C-NONACHLOR
13C-DELTA-HCH
13C-DIELDRIN
13C-FONOFOS
13C-GAMMA-HCH
13C-HCB
13C-HEPTACHLOR
13C-HEPTACHLOR-
EPOXIDE
13C-MIREX
13C-O.P-DDT
13C-OXYCHLORDANE
13C-P.P-DDE
13C-P.P-DDT
13C-PERMETHRINS-
PEAK 1
13C-PERMETHRINS-
PEAK 2
13C-T-CHLORDANE
13C-T-NONACHLOR
2,4'-DDD
2,4'-DDE
2,4'-DDT
4,4'-DDD
4,4'-DDE
4,4'-DDT
ALDRIN
ALPHA-ENDOSULPHAN
Solid-Based
on 5 samples
Solids
Average
Recovery
90.43
128.41
78.70
41.74
63.24
79.29
82.51
90.04
88.30
93.89
50.73
68.29
52.33
68.85
83.80
79.07
123.18
83.09
99.83
140.36
116.88
118.48
86.23
87.23
81.14
84.86
97.46
45.89
99.45
95.81
97.30
94.02
Solids
Standard
Deviation
31.77
32.12
35.89
33.54
40.59
33.93
31.58
31.72
31.10
31.51
40.18
32.52
31.93
33.42
31.90
31.94
30.97
30.78
30.31
30.94
32.00
32.32
29.38
31.29
1.09
15.50
0.50
3.04
0.67
0.94
1.88
4.50
Solids
Relative
Standard
Deviation
28.73
41.25
28.25
14.00
25.67
26.90
26.05
28.56
27.46
29.59
20.38
22.21
16.71
23.01
26.73
25.25
38.16
25.58
30.25
43.42
37.40
38.30
25.34
27.30
0.89
13.15
0.48
1.40
0.66
0.90
1.83
4.23
Reagent Water-Based
on 4 samples
Water
Average
Recovery
86.81
100.11
58.13
29.95
44.20
87.33
74.98
79.79
76.82
85.15
49.40
48.74
29.07
42.58
68.38
59.67
99.18
62.67
94.99
110.00
128.45
130.18
71.73
74.09
102.00
58.65
98.77
46.43
92.40
97.66
99.82
91.74
Water
Standard
Deviation
8.60
7.61
8.21
7.71
23.24
6.03
6.06
5.75
6.14
5.83
27.30
23.03
37.79
27.19
10.13
9.65
7.07
10.04
6.26
4.43
6.05
6.11
7.67
7.72
1.33
7.59
0.77
1.70
1.23
0.66
5.14
4.03
Water
Relative
Standard
Deviation
7.46
7.62
4.77
2.31
10.27
5.27
4.55
4.59
4.72
4.96
13.49
11.22
10.98
11.58
6.93
5.76
7.02
6.29
5.95
4.87
7.77
7.95
5.50
5.72
1.36
4.45
0.76
0.79
1.14
0.64
5.13
3.70
Biosolids-Based on 8 (native)
or 6 (label) samples
Biosolids
Average
Recovery
104.57
20.64
99.81
84.12
55.15
85.34
84.55
89.72
91.15
103.06
90.65
71.55
54.51
55.32
90.61
46.84
48.25
87.54
111.80
33.09
97.01
94.06
72.27
66.33
270.95
101.19
98.26
430.55
102.43
97.19
97.94
90.06
Biosolids
Standard
Deviation
13.16
53.78
7.05
10.42
13.54
7.72
11.92
8.54
6.01
5.37
8.48
17.26
17.21
34.65
7.70
24.47
43.86
11.61
5.68
50.74
11.02
11.15
21.41
26.20
81.98
2.88
9.75
97.71
7.38
7.90
15.24
13.49
Biosolids
Relative
Standard
Deviation
13.76
11.10
7.04
8.76
7.47
6.59
10.08
7.66
5.48
5.53
7.69
12.35
9.38
19.17
6.98
11.46
21.16
10.16
6.34
16.79
10.69
10.49
15.47
17.38
222.13
2.91
9.58
420.69
7.56
7.68
14.93
12.15
85
-------
Method 1699
December 2007
ALPHA-HCH
AMETRYN
ATRAZINE
AZINPHOS-METHYL
BETA-ENDOSULPHAN
BETA-HCH
CAPTAN
C-CHLORDANE
CHLOROTHALONIL
CHLORPYRIPHOS
CHLORPYRIPHOS-METHYL
CHLORPYRIPHOS-OXON
CL8-STYRENE
C-NONACHLOR
CYANAZINE
D10-DIAZINON
D6-AZINPHOS-METHYL
DACTHAL
DELTA-HCH
DESETHYLATRAZINE
DIAZINON
DIAZINON-OXON
DIELDRIN
DIMETHOATE
DISULFOTON
DISULFOTONSULFONE
ENDOSULPHAN-
SULPHATE
ENDRIN
ENDRIN-KETONE
ETHION
FENITROTHION
FONOFOS
GAMMA-HCH
HCB
HEPTACHLOR
HEPTACHLOR-EPOXIDE
HEXAZINONE
MALATHION
METHAMIDOPHOS
METHOXYCHLOR
METRIBUZIN
MIREX
OXYCHLORDANE
PARATHION-ETHYL
86.44
38.46
99.47
95.50
*
101.26
2.03
97.89
18.32
95.97
82.40
0.64
122.49
99.49
104.03
77.75
93.60
81.66
102.16
99.84
98.58
*
101.70
75.95
*
477.45
231 .97
101.22
104.25
90.12
101.29
106.68
95.92
102.21
100.14
101.40
27.26
83.84
29.71
101.14
80.54
103.40
97.11
91.86
2.34
57.63
1.51
1.32
*
1.23
1.77
43.37
30.61
31.23
42.62
16.49
1.65
38.26
36.37
42.99
31.90
1.56
2.63
1.85
*
0.95
38.51
*
41.55
1.94
3.00
10.11
61.34
35.89
2.93
1.44
0.10
1.30
1.84
90.24
34.77
37.83
2.51
37.63
2.45
0.88
34.54
2.03
22.17
1.50
1.27
*
1.24
1.73
7.94
29.38
25.73
0.27
20.20
1.64
39.80
28.28
40.24
26.05
1.59
2.63
1.83
*
0.97
29.25
*
198.40
4.50
3.04
10.54
55.28
36.36
3.13
1.39
0.10
1.30
1.87
24.60
29.15
11.24
2.54
30.31
2.53
0.86
31.72
80.00
105.31
98.95
91.43
*
103.95
39.76
95.29
46.46
85.71
70.07
84.10
109.15
99.95
99.88
71.13
118.19
77.16
99.31
86.50
98.08
131.28
103.87
85.52
*
651.23
271 .05
103.49
95.59
49.68
98.41
98.46
94.86
102.89
99.58
101.50
89.16
81.02
*
98.17
67.41
94.01
103.17
82.74
12.67
6.94
0.76
2.10
*
0.62
15.77
2.47
12.52
9.45
17.14
14.59
12.37
0.99
5.26
15.58
4.83
12.06
3.08
4.41
1.36
5.15
0.71
10.34
*
39.89
3.40
1.60
8.87
4.65
9.50
2.43
0.82
2.58
3.27
2.31
19.32
7.61
*
1.44
5.70
3.69
2.14
7.33
10.14
7.31
0.75
1.92
*
0.65
6.27
2.36
5.82
8.10
12.01
12.27
13.50
0.99
5.25
11.08
5.71
9.31
3.06
3.81
1.33
6.76
0.74
8.84
*
259.79
9.22
1.66
8.48
2.31
9.35
2.40
0.78
2.65
3.26
2.35
17.23
6.17
*
1.41
3.84
3.46
2.21
6.06
94.43
124.18
108.25
92.45
97.41
96.72
*
109.10
5.43
112.15
95.67
59.89
132.75
99.96
121.57
88.11
90.12
100.50
97.90
111.16
93.14
82.64
95.23
114.22
60.23
139.98
88.54
98.44
71.24
167.53
151.55
98.06
95.09
100.09
91.71
102.08
130.31
95.88
32.62
105.54
130.08
103.95
93.78
146.11
11.18
15.18
25.55
12.98
12.31
10.14
*
98.97
124.49
9.12
16.32
47.09
7.10
7.50
31.95
16.37
18.63
25.52
9.92
20.68
7.25
36.03
16.77
20.38
46.33
57.09
20.18
9.29
41.83
32.83
17.43
7.60
10.82
7.31
9.12
7.48
21.84
37.53
40.38
9.42
13.38
10.84
12.65
22.28
10.56
18.85
27.66
12.00
11.99
9.81
*
107.98
6.76
10.23
15.61
28.20
9.42
7.50
38.84
14.43
16.79
25.65
9.71
22.99
6.75
29.78
15.97
23.28
27.91
79.91
17.87
9.15
29.80
54.99
26.42
7.45
10.28
7.32
8.37
7.64
28.45
35.98
13.17
9.95
17.41
11.27
11.86
32.55
86
-------
Method 1699
December 2007
PARATHION-METHYL
PERTHANE
PHORATE
PHOSMET
PIRIMIPHOS-METHYL
QUINTOZENE
SIMAZINE
T-CHLORDANE
TECNAZENE
TERBUFOS
T-NONACHLOR
TOTAL-CYPERMETHRINS
TOTAL-PERMETHRINS
82.54
120.82
5.72
80.19
73.75
129.60
106.25
101.65
120.17
7.50
100.91
93.50
145.58
35.71
31.57
167.39
36.61
48.99
3.06
2.05
5.24
3.76
167.78
1.81
3.29
16.20
29.48
38.14
9.57
29.36
36.13
3.96
2.18
5.33
4.52
12.58
1.83
3.07
23.58
74.72
108.82
14.53
86.54
87.90
163.36
1 04.43
104.93
107.67
20.86
102.74
93.57
1 44.77
13.29
6.85
137.43
8.34
8.09
15.06
3.02
1.01
23.63
127.25
4.02
4.36
2.53
9.93
7.45
19.96
7.22
7.11
24.60
3.15
1.06
25.44
26.54
4.13
4.08
3.66
139.95
144.00
81.78
86.09
112.14
142.76
110.07
104.36
132.60
84.92
94.64
71.64
655.40
16.25
23.38
21.37
75.25
33.53
25.37
11.58
26.02
36.97
26.80
35.56
7.06
124.74
22.74
33.67
17.48
64.78
37.60
36.22
12.75
27.16
49.02
22.75
33.65
5.06
817.53
87
-------
Method 1699
December 2007
Prep per § 11.5
Spike Labeled Pesticides
§ 11.5.2.2
Determine % solids
§11.2
Determine particle size
§11.3
-Yes
Particle
size > 1mm?
(from §11.3)
Back extract per
§12.5
Prep per§ 11.4
Spike Labeled Pesticides
§ 11.4.2.2
Extract per § 12.2.1,
§ 12.2.2, or § 12.2.3
Transfer through Na2SO4
per§ 12.5.6
Concentrate per
§12.6-§12.7
Clean up per
§ 13.2-§ 13.5; § 13.7-
§13.8
Concentrate per
§12.6-§12.7
Spike injection internal
standard per § 14.2
Analyze per
§14-§18
Figure 1 Flow Chart for Analysis of Aqueous and Solid Samples
88
-------
Method 1699
December 2007
Determine % solids
§11.2
I.
Determine particle size
§11.3
Spike Labeled Pesticides
§ 11.6.2.2
Aqueous
Discard
Pressure filter aliquot per
§11.6.5
Non-aqueous (organic)
Reserve 10g or amount up
to 1 L, whichever is less
Transfer through Na2SO4
per§ 12.5.6
Concentrate per
§12.6-§12.7
Clean up per
§ 13.2-§ 13.5; § 13.7
§13.8
Concentrate per
§12.6-§12.7
Spike injection internal
standard per§ 14.2
Analyze per
§14-§18
Figure 2 Flow Chart for Analysis of Multi-Phase Samples
89
-------
Method 1699
December 2007
90
Homogenize tissue
per§ 11.8.1
Remove 10g
per§ 11.8.1.4
Spike Labeled Pesticides
per§ 11.8.3
Soxhlet extract
per§ 12.4
Concentrate to dryness
per§ 12.4.7-§ 12.4.8
Determine % lipids
per§ 12.4.9
Re-dissolve in n-Ce
per §12.4.9.1
I.
Remove lipids per
§13.6
Concentrate per
§12.6-§12.7
I.
Clean up per
§ 13.2-§ 13.5; § 13.7
§ 13.8
Concentrate per
§ 12.6-§ 12.7
Spike injection internal
standard per § 14.2
Analyze per
§14-§18
Figure 3 Flow Chart for Analysis of Tissue Samples
-------
Method 1699
December 2007
1000
7SO
SCO
250
r
l-LltB/SucttooFte*
Figure 4 Solid-phase Extraction Apparatus
91
-------
Method 1699
December 2007
Figure 5 Soxhlet/Dean-Stark Extractor
92
-------
Method 1699
December 2007
24.0
Glossary
These definitions and purposes are specific to this Method but have been conformed to common
usage to the extent possible.
24.1 Units of weight and measure
24.1.1 Symbols
EC degrees Celsius
OL microliter
m micrometer
< less than
> greater than
% percent
24.1.2 Alphabetical abbreviations
cm centimeter
g gram
hour
inside diameter
inch
liter
Molecular ion
mass or meter
milligram
minute
milliliter
millimeter
mass-to-charge ratio
normal; gram molecular weight of solute divided by hydrogen equivalent of
solute, per liter of solution
outside diameter
h
ID
in.
L
M
m
mg
min
mL
mm
m/z
N
OD
Pg
ppb
ppm
ppq
ppt
psig
v/v
w/v
picogram
part-per-billion
part-per-million
part-per-quadrillion
part-per-trillion
pounds-per-square inch gauge
volume per unit volume
weight per unit volume
25.0 Definitions and acronyms (in alphabetical order)
Analyte - A pesticide tested for by this Method. The analytes are listed in Table 1.
93
-------
Method 1699 December 2007
Calibration standard (CAL) - A solution prepared from a secondary standard and/or stock
solution and used to calibrate the response of the HRGC/HRMS instrument.
Calibration verification standard (VER) - The mid-point calibration standard (CS-4) that is
used to verify calibration. See Table 4.
CS-1, CS-2, CS-3, CS-4, CS-5, CS-6 - See Calibration standards and Table 4.
Field blank - An aliquot of reagent water or other reference matrix that is placed in a sample
container in the field, and treated as a sample in all respects, including exposure to sampling site
conditions, storage, preservation, and all analytical procedures. The purpose of the field blank is
to determine if the field or sample transporting procedures and environments have contaminated
the sample.
GC - Gas chromatograph or gas chromatography
GPC - Gel permeation chromatograph or gel permeation chromatography
HPLC - High performance liquid chromatograph or high performance liquid chromatography
HRGC - High resolution GC
HRMS - High resolution MS
Labeled injection internal standard - Labeled PCB52 is spiked into the concentrated extract
immediately prior to injection of an aliquot of the extract into the HRGC/HRMS.
Internal standard - a labeled compound used as a reference for quantitation of other labeled
compounds and for quantitation of native pesticides other than the pesticide of which it is a
labeled analog. See Internal standard quantitation.
Internal standard quantitation - A means of determining the concentration of (1) a naturally
occurring (native) compound by reference to a compound other than its labeled analog and (2) a
labeled compound by reference to another labeled compound.
IPR - Initial precision and recovery; four aliquots of a reference matrix spiked with the analytes
of interest and labeled compounds and analyzed to establish the ability of the laboratory to
generate acceptable precision and recovery. An IPR is performed prior to the first time this
Method is used and any time the Method or instrumentation is modified.
Isotope dilution quantitation - A means of determining a naturally occurring (native)
compound by reference to the same compound in which one or more atoms has been isotopically
enriched. In this Method, labeled are enriched with carbon-13 to produce 13C-labeled analogs.
The 13C-labeled pesticides are spiked into each sample to allow identification and correction of
the concentration of the native compounds in the analytical process.
K-D - Kuderna-Danish concentrator; a device used to concentrate the analytes in a solvent
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Laboratory blank - See Method blank
Laboratory control sample (LCS) - See Ongoing precision and recovery standard (OPR)
Laboratory reagent blank - See Method blank
May - This action, activity, or procedural step is neither required nor prohibited.
May not - This action, activity, or procedural step is prohibited.
Method blank - An aliquot of reagent water that is treated exactly as a sample including
exposure to all glassware, equipment, solvents, reagents, internal standards, and surrogates that
are used with samples. The Method blank is used to determine if analytes or interferences are
present in the laboratory environment, the reagents, or the apparatus.
Method detection limit (MDL) - The lowest concentration at which a pesticide can be detected
under routine operating conditions (see 40 CFR 136, appendix B). MDLs are listed in Table 1.
Minimum level (ML) - The greater of a multiple of the MDL or the lowest calibration point (see
68 FR 11790, March 12, 2003.)
MS - Mass spectrometer or mass spectrometry
Must - This action, activity, or procedural step is required.
OPR - Ongoing precision and recovery standard (OPR); a method blank spiked with known
quantities of analytes. The OPR is analyzed exactly like a sample. Its purpose is to assure that
the results produced by the laboratory remain within the limits specified in this Method for
precision and recovery.
Perfluorokerosene (PFK) - A mixture of compounds used to calibrate the exact m/z scale in the
HRMS.
Preparation blank - See Method blank
Quality control check sample (QCS) - A sample containing all or a subset of the analytes at
known concentrations. The QCS is obtained from a source external to the laboratory or is
prepared from a source of standards different from the source of calibration standards. It is used
to check laboratory performance with test materials prepared external to the normal preparation
process.
Reagent water - water demonstrated to be free from the analytes of interest and potentially
interfering substances at the method detection limit for the analyte.
Relative standard deviation (RSD) - The standard deviation times 100 divided by the mean.
Also termed "coefficient of variation."
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RF - Response factor. See Section 10.5
RR - Relative response. See Section 10.4
RSD - See relative standard deviation
SDS - Soxhlet/Dean-Stark extractor; an extraction device applied to the extraction of solid and
semi-solid materials (Reference 3 and Figure 5).
Signal-to-noise ratio (S/N) - The height of the signal as measured from the mean (average) of
the noise to the peak maximum divided by the width of the noise.
Should - Although this action, activity, or procedural step is suggested and not required, you
may be asked why you changed or omitted this action, activity, or procedural step.
SICP - Selected ion current profile; the line described by the signal at an exact m/z.
SPE - Solid-phase extraction; an extraction technique in which an analyte is extracted from an
aqueous sample by passage over or through a material capable of reversibly adsorbing the
analyte. Also termed liquid-solid extraction.
Stock solution - A solution containing an analyte that is prepared using a reference material
traceable to EPA, the National Institute of Science and Technology (NIST), or a source that will
attest to the purity and authenticity of the reference material.
Unique GC resolution or uniquely resolved - Two adjacent chromatographic peaks in which
the height of the valley is less than 10 percent of the height of the shorter peak (see Section
6.9.1.1.2).
VER - See Calibration verification.
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