United States Environmental Protection Agency
Office of Water
Office of Environmental Information
Washington, DC
EPA841-B-04-008
Wadeable Streams Assessment
Water Chemistry
Laboratory Manual
July 2004
FINAL
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NOTICE
The intention of the NWSA project is to provide a comprehensive "State of the Streams"
assessment for streams across the United States. The complete documentation of overall WSA
project management, design, methods, and standards is contained in five companion
documents, including:
National Wadeable Streams Assessment Integrated Quality Assurance Project Plan
National Wadeable Streams Assessment- Site Evaluation Guidelines
National Wadeable Streams Assessment: Field Operations Manual
National Wadeable Streams Assessment: Benthic Laboratory Methods
National Wadeable Streams Assessment Water Chemistry Laboratory Manual
This document (Water Chemistry Laboratory Manual) contains information on the methods for
analyses of the water samples to be collected during the project, quality assurance objectives,
sample handling, and data reporting. These methods are based on the guidelines developed
and followed in the Western Environmental Monitoring and Assessment Program (Peck et al.
2003). Methods described in this document are to be used specifically in work relating to WSA.
All Project Cooperator laboratories should follow these guidelines, as they apply to the chemical
parameters detailed in the RFP Mention of trade names or commercial products in this
document does not constitute endorsement or recommendation for use More details on
specific methods for site evaluation, sampling, and sample processing can be found in the
appropriate companion document
The suggested citation for this document is:
USEPA 2004. National Wadeable Stream Assessment: Water Chemistry Laboratory
Manual. EPA841-B-04-008 U.S Environmental Protection Agency, Office of Water
and Office of Research and Development, Washington, DC.
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Quality Assurance Plan
Willamette Research Station
Analytical Laboratory
Revision 1, March 2003
200 SW 35th Street
Corvallis, Oregon
Marilyn Morrison Erway
Kathy M otter
Karen Baxter
Dynamac Corporation
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WRSQAP.rovO
June 6.2001
Willamette Research Station Analytical Laboratory
Quality Assurance Plan
Dynamac Corporation:
Signature indicates that this QAP is approved and will be implemented in conducting
the research of this project.
Kathryn Motter
WRS Analytical Laboratory signati/re C uate
Manager
Kent Rodecap *^±. /T. fi^A**^ £//¥/*!
Dynamac Program Signature Date
Quality Assurance Officer
Tom Moser
Dynamac Program Manager Signature Date
EPA Quality Assurance:
Signature indicates that this QAP meets_the quality requirements of WED.
Dave Peck y.-^'/ I/ **& _ tf/Z/Of
EMAP Quality Assurance Officer Signature Date
rtf*.
Craig McFarlane
Quality Assurance Officer Signaturja Date
Management Approvals:
Signature indicates that this QAP is approved and will be implemented in conducting
the research of this project.
Steve Paulsen ——
Regional Ecology Branch Chief Signature Date
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Table of Contents
List of Tables v
Acronyms/Abbreviations vi
1.0 PROJECT DESCRIPTION 1
2.0 PROJECT ORGANIZATION AND RESPONSIBILITIES 1
3.0 QUALITY ASSURANCE OBJECTIVES 8
4.0 SAMPLE CONTAINERS AND GLASSWARE PREPARATION 8
4.1 125-ml Rectangular and Square Bottles: Acid-Washed 10
4.2 125-ml Round Bottles: RO-Soaked 10
4.3 Auto-Titrator 100-ml Beakers (Lab 35) 11
4.4 Carbon Analyzer 40-ml Glass Vials (Lab 37) 11
4.5 40-ml Vial Septum Caps 11
4.6 Luer-Lok Syringe Valves 11
4.7 Volumetric Flasks 11
4.8 TS Beakers (Lab 11) 12
4.9 Digestion Tubes for Total N and Total P (Lab 37) 12
4.10 Omni Vials for SiO2 Analysis (Lab 37) 12
4.11 PipetTips, Reused for Total P and Total N Digestions (Lab 11) 12
4.12 1C Vials 13
4.13 Laboratory Maintenance 13
5.0 SAMPLE CUSTODY, PREPARATION, AND PRESERVATION 13
5.1 Sample Custody 13
5.2 Sample Processing and Preservation 15
5.3 Sample Tracking 17
6.0 CALIBRATION AND ANALYTICAL PROCEDURES 17
6.1 Balance and Pipette Calibration 21
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6 2 Calibration Standard Preparation 21
6.3 Calibration and Run Procedures for FIA, 1C, AAS, and Carbon Analyzer... 21
6.4 Calibration and Run Procedures for pH, ANC, and Specific Conductance. 24
6.5 Method Detection Limit 24
7.0 INTERNAL QUALITY CONTROL CHECKS 26
7.1 Second Source Check Standard (SSCS) 26
7.2 Quality Control Check Samples (QCCS) 26
7.3 QCCS for pH, Conductivity, ANC, and TS 27
7.4 Laboratory Duplicates 27
7.5 Analytical Duplicate 27
7.6 Field Duplicate 28
7.7 Miscellaneous Laboratory Quality Control Procedures 28
8.0 CALCULATION OF DATA QUALITY INDICATORS 28
9.0 DATA REDUCTION, VALIDATION, AND REPORTING 29
10.0 PERFORMANCE AND SYSTEM AUDITS 32
11.0 REFERENCES 33
Appendix A: List of Standard Operating Procedures for the Willamette Research
Station Analytical Laboratory 34
IV
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List of Tables
Table 1.1 WRS Analytical Laboratory: Methods and Detection Limits for Water
Chemistry Analyses 2
Table 1.2 WRS Analytical Laboratory: Methods and Detection Limits for Fish
Tissue Analyses 6
Table 1.3 WRS Analytical Laboratory: Methods and Detection Limits for
Periphyton Analyses 7
Table 3.0 WRS Analytical Laboratory: Quality Assurance Objectives 9
Table 5.1 WRS Analytical Laboratory: Sample Processing and Tracking
Information 14
Table 5.2 WRS Analytical Laboratory: Annual Sample Processing Schedule
(Example from FY2001) 16
Table 5.3 WRS Analytical Laboratory: Annual Master Tracking Sheet (Example
fromFY2001) 18
Table 5.4 WRS Analytical Laboratory: Sample Tracking Sheet 19
Table 5.5 Examples of Holding Times 20
Table 6.2.1 Standard Preparation Log Sheet 22
Table 6.2.2 Working Standard Preparation Log Sheet 23
Table 6.3 Example of a Run Log for an Analytical Instrument 25
Table 9.0 WRS Analytical Laboratory: Data Package Cover Sheet 30
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Acronyms/Abbreviations
AAS atomic absorption spectrophotometer
AD analytical duplicate
AGRIP Agricultural and Riparian Areas project
ANC acid neutralizing capacity
ASTM American Society for Testing and Materials
cm centimeter
DIG dissolved inorganic carbon
DL detection limit
DOC dissolved organic carbon
EMAP Environmental Monitoring and Assessment Program
EPA Environmental Protection Agency
ERL-C Environmental Research Laboratory-Corvallis
FAAS Flame Atomic Absorption Spectrophotometer
FD field duplicate
FIA flow injection analyzer
FY fiscal year
HOPE high-density polyethylene
1C ion chromatograph
IDL instrument detection limit
vii
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L liter
MDL method detection limit
mg milligram
ueq microequivalent
ug microgram
|jm micrometer
uS microsiemen
ng nanogram
NIST National Institute of Standards and Technology
NIVA Norwegian Institute for Water Research
NTU nephelometric turbidity units
NWRI National Water Research Institute
OCH Off-Channel Habitat project
PCV pyrocatechol violet
PE performance evaluation
PPE personal protective equipment
ppm parts per million
psi pounds per square inch
QA quality assurance
QAP Quality Assurance Plan
QAPP Quality Assurance Project Plan
QCCS quality control check sample
RPD relative percent difference
RO reverse osmosis
viii
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RSD relative standard deviation
SOP Standard Operating Procedure
SSCS second source check standard
TON total dissolved nitrogen
TOP total dissolved phosphorus
TIME Temporally Integrated Monitoring of Ecosystems project
TN total nitrogen
TP total phosphorus
TS total solids
TSS total suspended solids
UV-vis ultraviolet-visible
v/v volume ratio
WED Western Ecology Division of the National Health and Environmental
Effects Research Laboratory, U.S. EPA
WRS Willamette Research Station
ZL-GFAAS Longitudinal Zeeman corrected graphite furnace atomic absorption
spectrophotometer
IX
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1.0 PROJECT DESCRIPTION
The Willamette Research Station (WRS) Analytical Laboratory is part of the
Western Ecology Division (WED) of the National Health and Environmental Effects
Laboratory in the U.S. EPA's Office of Research and Development. The WRS
Laboratory was established in the summer of 1997 to support research projects at
WED. The Laboratory provides complete services for all sample preparation and
analyses, including sample filtration, preservation, digestions, and extractions. The
Laboratory supports projects in both the Regional Ecology and Terrestrial Branch. This
Quality Assurance Plan (QAP) for the WRS Analytical Laboratory describes the
protocols and procedures used by the Laboratory, and follows the guidelines
established in EPA's Quality Management Plan for ERL-C (U.S. EPA, 1995) and
Dynamac's Program Quality Management plan (Dynamac Corporation, 2001). Tables
1.1,1.2, and 1.3 list the methods and detection limits used at the WRS Laboratory for
water chemistry, fish tissue, and periphyton analyses, respectively. Specific protocols
and methods for each analytical instrument are provided in a separate document, the
Standard Operating Procedures (SOPs) for the WRS Analytical Laboratory. Appendix
A lists the SOPs available as of March, 2003. Site selection and sampling procedures
are described under each project's QA Project Plan.
2.0 PROJECT ORGANIZATION AND RESPONSIBILITIES
The current staff at the WRS Laboratory and their primary responsibilities is
listed below Even though each chemist has primary responsibility for at least one
instrument, the goal at the WRS Laboratory is for all chemists to perform analyses on
several instruments.
TBD, Dynamac Corp.: Laboratory Manager; Data management and analysis,
Lachat Flow Injection Analysis, overall instrumentation and QA monitoring,
purchasing, waste disposal, overall sample processing and Laboratory
maintenance
Karen Baxter, Dynamac Corp.: Atomic absorption spectrophotometer and
graphite furnace, ion chromatograph, carbon analyzer, fluorometer, UV-
vis spectrophotometer, QA, overall sample processing
Rachael Wahl, Dynamac Corp.: Sample log-in and filtration, pH, conductivity,
turbidity, total solids, total suspended solids, ANC titrator, UV-vis
spectrophotometer, color, flow injection analysis, QA
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Table 1.1 WRS Analytical Laboratory: Methods and Detection Limits for Water Chemistry Analyses
Analyte
WRS Method No 1
pH (syringe)
WRS10A1
Specific
Conductance
WRS11A1
Acid Neutralizing
Capacity (ANC)
WRS 12A 1
Turbidity
WRS13A1
Total Solids
WRS 14A 1
Total Suspended
Solids (Residue)
WRS 14B 1
True Color
WRS15A1
Dissolved Organic
Carbon (DOC)
WRS 21A 1
Dissolved Inorganic
Carbon (DIC)
Instrument2
Beckman pH meter
YSI Conductivity
Meter
ManTech
AutoTitrator
Hach Turbidimeter
NA
NA
Hach Kit
Dohrmann Carbon
Analyzer
Dohrmann Carbon
Analyzer
Preparation Method3
NA
NA
NA
NA
NA
NA
Filter 0 4 urn
Filter 0 4 urn,
Acidify with H2SO4
(preservation
optional)
Syringe Filter
045um
Instrument Methods4
EPA 150 6 (modified)
US EPA (1987)
EPA 120 6,
US EPA (1987)
EPA 31 01 (modified),
US EPA (1987)
APHA214A,
EPA 1801,
US EPA (1987)
EPA 160 3
EPA 160 2,
APHA(1989)
APHA 204 A, EPA 100.2
(modified), US EPA (1987)
EPA 41 5 2,
US EPA (1987)
US EPA (1987)
Comments
Ross Electrode, Closed Cell System
Temperature Corrected to 25°C
Automated acidimetric titration to
pH<3 5, with Modified Gran Analysis
Gravimetric
Gravimetric
Visual comparison to color disc
UV-persulfate oxidation
Acid oxidation to C02
Detection Limit
NA
NA
NA
01 NTU
0 1 mg/L
0 1 mg/L
NA
0 1 mg/L
0 1 mg/L
WRS 20A1
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Table 1.1 WRS Analytical Laboratory: Methods and Detection Limits for Water Chemistry Analyses
Analyte
WRS Method No.1
Ammonia Nitrogen
WRS 30A 1
Ammonia Nitrogen
WRS 30A 1
Soluble Reactive
Phosphorus (SRP)
WRS 33A 1
Nitrate + Nitrite
Nitrogen
WRS 31A 1
Silica (SiOz)
WRS 32A 1
Total Nitrogen (TN)
WRS 34A 1
Total Phosphorus
(TP)
WRS 34A 1
Total Dissolved
Nitrogen (TON)
WRS 34A 1
Instrument2
FIA
FIA
FIA
FIA
FIA
FIA
FIA
FIA
Preparation Method3
Filter 0 4 um
Filter 04 um,
Acidify with H2SO4
Filter 0 4 urn
Filter 0 4 um
Filter 0 4 urn
Acidify with H2S04
Acidify with H2S04
Filter 0 4 um,
Acidify with H2SO«
Instrument Methods4
Lachat10-107-06-3-D
Lachat10-107-06-3-D
Lachat10-115-01-1-B
Lachat 10-1 07-04-1 -C
Lachat10-114-06-2-B
Lachat 10-1 07-04-1 -C
Lachat 10-115-01-1-B
Lachat 10-1 07-04-1 -C
Comments
Automated Colorimetric (salicylate,
dichloroisocyanurate)
Automated Colorimetric (salicylate,
dichloroisocyanurate)
Automated Colorimetric (molybdate,
ascorbic acid)
Automated Colorimetric (Cadmium
Column, EDTA, sulfanilamide)
Automated Colorimetric Analysis
(molybdate, stannous chloride)
Persulfate Digestion; Automated
Colorimetric Analysis (Cadmium
Column, EDTA, sulfanilamide)
Persulfate Digestion; Automated
Colorimetric (molybdate, ascorbic
acid)
Persulfate Digestion, Automated
Colorimetric Analysis (Cadmium
Column, EDTA, sulfanilamide)
Detection Limit
2M9/L
2 ug/L
1 ug/L
1ug/L
5 ug/L
10 ug/L
2M9/L
10 ug/L
Total Dissolved
Phosphorus (TOP)
WRS 34A 1
FIA
Filter 04 um,
Acidify with H2SO4
Lachat 10-115-01-1-B
Persulfate Digestion; Automated
Colorimetric (molybdate, ascorbic
acid)
2 ug/L
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Table 1.1 WRS Analytical Laboratory: Methods and Detection Limits for Water Chemistry Analyses
Analyte
WRS Method No 1
Total Monomenc
Aluminum
WRS 35A 1
Organic Monomenc
Aluminum
WRS 35A 1
Chloride
WRS 40A 1
Nitrate
WRS 40A 1
Sulfate
WRS 40A 1
Calcium
WRS 50A 1
Sodium
WRS 50A 1
Potassium
WRS 50A 1
Magnesium
WRS 50A 1
Zinc
WRS 50A 1
Instrument2
FIA
FIA
1C
1C
1C
FAAS
FAAS
FAAS
FAAS
FAAS
Preparation Method3
Syringe Filter
045 urn
Syringe Filter
045um
Filter 0 4 urn
Filter 0 4 urn
Filter 0.4 urn
Filter 0 4 um,
Acidify with HNO3
Filter 0 4 urn,
Acidify with HNO3
Filter 0.4 um.
Acidify with HNO3
Filter 0 4 urn,
Acidify with HNO3
Filter 0 4 um,
Acidify with HNO3
Instrument Methods*
APHA 3000-AI E,
APHA(1989),
US EPA (1987)
APHA 3000-AI E,
APHA (1989),
US EPA (1987)
EPA 300 6,
US EPA (1987)
EPA 300 6.
US EPA (1987)
EPA 300 6,
US EPA (1987)
EPA 2151;
US EPA (1987)
EPA 2731;
US EPA (1987)
EPA 2581,
US EPA (1987)
EPA 2421,
US EPA (1987)
EPA 2891,
US EPA (1987)
Comments Detection Limit
Automated Colonmetric (pyrocatechol 10 ug/L
violet (PCV) amberlite column)
Automated Colonmetric (pyrocatechol 10 pg/L
violet (PCV) amberlite column)
0 03 mg/L
0.03 mg/L
0 05 mg/L
0 02 mg/L
0 02 mg/L
0 04 mg/L
0 01 mg/L
0 005 mg/L
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Table 1.1 WRS Analytical Laboratory: Methods and Detection Limits for Water Chemistry Analyses
Analyte
WRS Method No 1
Aluminum
WRS 51A 1
Selenium
WRS 51A 1
Instrument2
ZL-GFAAS
ZL-GFAAS
Preparation Method3
Filter 0 4 urn,
Acidify with HN03
Filter 04 urn,
Acidify with HNO3
Instrument Methods4
EPA 202 2;
US EPA (1987)
EPA 270 2,
US EPA (1987)
Comments Detection Limit
0 01 mg/L
0 002 mg/L
1 Standard Operating Procedures (SOPs) for the WRS Analytical Laboratory
2 Instruments FIA" Flow injection analyzer
1C Ion chromatograph
FAAS Flame atomic absorption spectrophotometer
ZL-GFAAS' longitudinal Zeeman corrected graphite furnace atomic absorption spectrophotometer
4 Method References
U S EPA, 1987 Handbook of Methods for Acid Deposition Studies Laboratory Analyses for Surface Water Chemistry EPA/600/4-87/026 US
Environmental Protection Agency, Office of Research and Development, Washington D C
US EPA 1983 Methods for Chemical Analysis of Water and Wastes EPA-600/4-79/020 Environmental Monitoring and Support Laboratory, Office of
Research and Development, U.S EPA, Cincinnati, OH
APHA 1989 Standard Methods for the Examination of Water and Wastewater. Seventeenth Edition American Public Health Association, Washington,
DC
Lachat instruments, QuikChem 8000 Manual. Zellweger Analytics, Milwaukee, Wl
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Table 1.2 WRS Analytical Laboratory: Methods and Detection Limits for Fish Tissue Analyses
Analyte
WRS Method No.1
Mercury
WRS 60A 1 and
WRS 61A 1
Arsenic
WRS 51A.1 and
WRS 60A 1
Cadmium
WRS 51A 1 and
WRS 60A 1
Lead
WRS 51A.1 and
WRS 60A.1
Selenium
WRS 51A.1 and
WRS 60A 1
Zinc
WRS 51A 1 and
WRS 60A 1
Instrument
Milestone DMA-80
ZL-GFAAS2
ZL-GFAAS
ZL-GFAAS
ZL-GFAAS
ZL-GFAAS
Preparation Method
Homogenization
Homogenization,
digestion
Homogenization,
digestion
Homogenization,
digestion
Homogenization,
digestion
Homogenization,
digestion
Instrument
Methods3
EPA 7473
EPA 206 2
EPA 21 3 2
EPA 239.2
EPA 270 2
EPA 289 2
Comments
Direct Analysis Method
Microwave digestion with nitric acid and hydrogen
peroxide method developed at WRS
Microwave digestion with nitric acid and hydrogen
peroxide method developed at WRS
Microwave digestion with nitric acid and hydrogen
peroxide method developed at WRS
Microwave digestion with nitric acid and hydrogen
peroxide method developed at WRS
Microwave digestion with nitric acid and hydrogen
peroxide method developed at WRS
Detection Limit
0 05 ng Hg
1M9/L
0 1 ug/L
1ug/L
2 ug/L
0 05 ug/L
1 Standard Operating Procedures (SOPs) for the WRS Analytical Laboratory
2 longitudinal Zeeman corrected graphite furnace atomic absorption spectrophotometer
3 US EPA 1983 Methods for Chemical Analysis of Water and Wastes. EPA-600/4-79/020 Environmental Monitoring and Support Laboratory, Office of
Research and Development, U S EPA, Cincinnati, OH
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Table 1.3 WRS Analytical Laboratory: Methods and Detection Limits for Periphyton Analyses
Analyte
WRS Method No'
Instrument
Preparation Method
Instrument Methods
Comments
Detection Limit
Chlorophyll a Fluorometer and UV- Filtration (GF/F), and Welschmeyer, 1994, and
WRS 71A 1 VIS spectrophotometer extraction with acetone Turner Designs
Acid/Alkalme
Phosphatase Activity
WRS72A.1
UV-VIS
spectrophotometer
Sayler, Puziss, and Silver,
1979
Method from Brian Hill,
US EPA
Ash-Free Dry Mass
WRS 73A 1
NA
Filtration (GF/F),
ash at550°C
1994 Pilot Laboratory
Methods Manual for
Streams, from U S EPA
Method from Brian Hill,
US EPA
1 Standard Operating Procedures (SOPs) for the WRS Analytical Laboratory
2 Method References
Personal communication, Brian Hill, U S EPA, Cincinnati, Ohio
Sayler, Puziss, and Silver 1979 Alkaline phosphatase assay for freshwater sediments Applied and Environmental Microbiology 38 922-927
Turner Designs, 845 W Maude Ave. Sunnyvale, CA 94086
Welschmeyer, N A 1994 Fluorometnc analysis of chlorophyll a in the presence of chlorophyll b and pheopigments Limnology and Oceanography
39 1985-1992
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Jason Schacher, Dynamac Corp.: Fish sample preparation and mercury
analysis, sample log-in and filtration, pH, conductivity, UV-vis
spectrophotometer, turbidity, color, carbon analyses, periphyton,
chlorophyll, QA, safety committee representative
Richard Kovar, Dynamac Corp.: Sample tracking, log-in, and filtration, pH,
conductivity, turbidity, total solids, total suspended solids, ANC titrator,
UV-vis spectrophotometer, color, microwave digestion of fish samples, QA
Ton! Hoyman, Dynamac Corp., Sample log-in and filtration, pH, conductivity, fish
sample processing, QA
Marj Storm, Dynamac Corp., Sample log-in and filtration, pH, conductivity, IS,
fish sample processing
Suean Ott, Dynamac Corp., Sample log-in and filtration, pH, conductivity,
turbidity, TS/TSS, microwave digest offish samples, TN/TP digestion, QA
Rashelle Simmons, Dynamac Corp., Sample log-in and filtration, pH,
conductivity, microwave digest of fish samples, 1C back-up, QA
Marilyn Erway, Dynamac Corp.: Ion chromatograph, data quality reports, QA
3.0 QUALITY ASSURANCE OBJECTIVES
Table 3.0 lists the quality assurance objectives for the WRS Analytical
Laboratory. Individual research projects may develop QA objectives that will supersede
the objectives listed here.
4.0 SAMPLE CONTAINERS AND GLASSWARE PREPARATION
Water samples are processed into filtered and unfiltered aliquots, with some
aliquots preserved with ultra-pure acid (HNOa or h^SCv) and some with no preservative,
according to the requirements of the analyte and project. The WRS Laboratory
convention is to use rectangular or square bottles for acid-preserved aliquots, and
round bottles for unacidified aliquots. Consequently, rectangular or square bottles are
acid-washed, while round bottles are washed with reverse-osmosis (RO) water. This .
section describes the protocols for washing these sample bottles, as well as the
procedures for preparing glassware for specific instruments and general laboratory use.
8
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Table 3.0 WRS Analytical Laboratory: Quality Assurance Objectives
Analyte
Temperature
Conductivity
Chlorophyll a
Turbidity
PH
Acid Neutralizing
Capacity (ANC)
Nitrate (N03), by ion
chromatography
Nitrate (NO3), by flow-
mjection analyzer
Nitrite (N02)
Ammonium (NH4)
Soluble Reactive
Phosphate (SRP)
Dissolved Organic
Carbon (DOC)
Dissolved Inorganic
Carbon (DIC)
Total Nitrogen (TN)
Total Phosphorous (TP)
Sulfate (SO4)
Chloride (Cl)
Calcium (Ca)
Magnesium (Mg)
Sodium (Na)
Potassium (K)
Units
°C
uS/cm
ug/L
NTU
pH units
u.eq/L
mgN/L
mgN/L
0 mg N/L
mg Wi-
ng P/L
mgC/L
mgC/L
mgN/L
mg P/L
mg S04/L
mg CI/L
mg Ca/L
mg Mg/L
mg Na/L
mg K/L
Method
Detection Limit1
NA
NA
10
01
NA
NA
003
0.001
0001
0002
10
01
01
0.01
0002
005
003
002
001
002
004
Concentration
Range
all
<40
>40
all
<10
>10
<575
>575
<100
>100
<0.4
>04
<0.4
>04
<04
>0.4
<04
>0.4
<15
>15
<1
>1
<1
>1
S03
>03
<03
>03
<1 5
>1 5
S1 5
>1.5
11 5
>1 5
<1.5
>1 5
<1 5
>1 5
<1 5
>1 5
Precision
Objective2
5%
±2
3%
20%
±2
10%
±007
±015
±5
5%
±003
5%
±003
5%
±003
5%
±003
5%
±2
10%
±01
10%
±01
10%
±005
10%
±005
10%
±010
5%
±010
5%
±010
5%
±0.10
5%
±0.10
5%
±010
5%
Accuracy
Objective3
NA
±2
5%
20%
±1
10%
±0.05
±0.10
±4
4%
±002
5%
±0.02
5%
±002
5%
±002
5%
±1
7%
±01
7%
±01
7%
±002
7%
±002
7%
±010
5%
±010
5%
±010
5%
±010
5%
±010
5%
±010
5%
The method detection limit is determined as a one-sided 99% confidence interval from repeated measurements of a low-level
standard across several calibration curves
2 Precision is estimated as the standard deviation of repeated measurement at the lower concentration range, and as percent
relative standard deviation at the higher concentration range
3 Accuracy is estimated as the difference between the measured and target values of performance evaluation samples at the lower
concentration range, and as the percent difference at the higher concentration range
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4.1 125-ml Rectangular and Square Bottles: Acid-Washed
Fill individual bottles to the brim with 10% (v/v) HCI, cap, and place in a plastic
tray labeled with bottle content, technician's name, and date. Soak overnight, then
pour the acid back into the acid carboy for reuse. New 10% (v/v) HCI is prepared as
needed whenever the acid becomes cloudy or contains particulates. Measure and
record the initial conductivity of the RO water. If the conductivity exceeds 1 u.S/cm,
notify one of the chemists to initiate corrective action. Rinse bottles five times with RO
water, then fill with RO water, cap, and soak overnight.
At the end of the RO-soak time, measure the conductivity of the RO water in
20% of bottles. Record the total number of bottles washed and the conductivity values
of checked bottles in the Bottle Wash Log Book. If any exceed the conductivity of RO
water measured the preceding day +0.6 u.S/cm, measure conductivity in all bottles in
that batch. Rinse bottles with conductivity greater than the accepted limit five times, fill
with RO water, cap, and soak overnight again. Repeat this procedure until the
conductivity of the RO water in the bottle is within the accepted limit.
Rinse bottles and caps within the accepted limit once, and dry completely in the
reverse-flow hood in lab 35 or lab 37. Store clean, dried, and capped bottles with like
bottles in large plastic tubs in lab 10 or lab 42.
4.2 125-ml Round Bottles: RO-Soaked
Measure and record the initial conductivity of the RO water. If the conductivity
exceeds 1 u.S/cm, notify one of the chemists to initiate corrective action. Rinse bottles
five times with RO water, then fill with RO water, cap, and soak overnight.
At the end of the RO-soak time, measure the conductivity of the RO water in
20% of bottles. Record the total number of bottles washed and the conductivity values
of checked bottles in the Bottle Wash Log Book. If any exceed the conductivity of RO
water measured the preceding day +0.6 u.S/cm, measure conductivity in all bottles in
that batch. Rinse bottles with conductivity greater than the accepted limit five times, fill
with RO water, cap, and soak overnight again. Repeat this procedure until the
conductivity of the RO water in the bottle is within the accepted limit.
Rinse bottles and caps within the accepted limit once, and dry completely in the
reverse-flow hood in lab 35 or lab 37. Store clean, dried, and capped bottles with like
bottles in large plastic tubs in lab 10 or lab 42.
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4.3 Auto-Titrator 100-ml Beakers (Lab 35)
Scrub beakers with brush to remove dried residue, and rinse five times with RO
water. Fill beakers with RO water and place in a plastic container labeled with beaker
content, technician's name, and date. Soak overnight, then rinse beakers once with
RO water, dry in the reverse-flow hood in lab 35, and store on the trays in drawer in lab
35.
4.4 Carbon Analyzer 40-ml Glass Vials (Lab 37)
Rinse clear and brown glass vials five times with RO water, then submerge in 2%
(v/v) HCI in a labeled container, and soak overnight. At the end of the soak time,
remove from acid bath and pour the acid back into the acid carboy for reuse. Rinse the
vials five times with RO water, then submerge in RO water and soak overnight. At the
end of the RO-soak time, rinse the vials once with RO water, then dry thoroughly in the
reverse-flow hood in lab 35 or 37. Store the clear glass vials for DIG analysis in the
labeled box in lab 37.
Bake the brown glass vials for DOC analysis in the muffle furnace at 550°C for
two hours, then cool overnight in the furnace. Store the brown vials in the appropriately
labeled box in lab 37.
4.5 40-ml Vial Septum Caps
Rinse septum caps five times with RO water, then soak in RO water overnight.
Rinse the caps once with RO water after soaking, then thoroughly dry in the reverse-
flow hood, and store in a zippered plastic bag in lab 37.
4.6 Luer-Lok Syringe Valves
Rinse syringe valves five times with RO water, then soak in RO water overnight.
Rinse once with RO water after soaking, then thoroughly dry in the reverse-flow hood,
and store in a zippered plastic bag in lab 10.
4.7 Volumetric Flasks
Rinse volumetric flasks five times with RO water after each use, then fill with RO
water, and cap. Air-dry volumetric flasks that are not used on a regular basis, then cap
and store in the cabinets in lab 37.
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4.8 TS Beakers (Lab 11)
Fill each beaker used for analysis of total solids (TS) with RO water and half of
an Alcotab. Soak overnight, then scrub with brush to remove residue. Rinse five times
with RO water and set on dish rack to air dry.
4.9 Digestion Tubes for Total N and Total P (Lab 37)
Tubes to be washed are stored in orange Styrofoam trays at the end of the
counter in lab 37. Remove labels, and empty contents of tubes into a plastic beaker
("CAUTION - Acid Waste! Wear proper personal protective equipment (PPE), handle
and dispose of properly). Discard the collected waste into the FIA PO4 Waste
Container. Place tubes upright in a large plastic tub, and cover with a grate to hold in
place. Place lids in a large plastic wash bottle.
Rinse tubes and lids five times with RO water, then soak in RO water overnight.
After the soak period, rinse tubes and lids once with RO water and dry thoroughly in the
hood. Place lids on tubes and store in the orange Styrofoam racks in lab 11.
4.10 Omni Vials for SiO2 Analysis (Lab 37)
Poke vials into grate, then rinse five times with Millipore Water (Millipore Milli-Q™
Ultra-Pure Water System, ASTM Type I). Use a tray or tub to facilitate rinsing. Fill with
Millipore Water and soak overnight. Rinse once more with Millipore water and dry
thoroughly in the hood.
Store clean, dry vials in labeled, zipped plastic bags in lab 37 cabinet.
4.11 Pipet Tips, Reused for Total P and Total N Digestions (Lab 11)
Used pipet tips are stored in a plastic bin in lab 11. CAUTION! Tips have caustic
residue - wear proper PPE and use care in handling.
Place tips in grate in plastic tub until tightly packed. In lab 35, rinse thoroughly
three times with RO water. Fill to cover with RO water and add approximately 10%
bleach. Properly label and soak overnight to remove organics. Dispose of bleach
solution down the drain. Rinse tips three times with RO water, then fill to cover with RO
water and soak overnight.
Rinse once with RO water and dry (in grate) in the hood. Place in labeled,
zipped plastic bag and store on the shelf in lab 11.
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4.12 1C Vials
Place Dionex 5-ml 1C vials upright in a small plastic tray, then hold in place with a
small grate. Rinse vials three times with RO water, then fill with RO water and soak
overnight. Rinse vials three times, then dry in the reverse-flow hood in lab 37. Store
vials in the plastic tray with lid in lab 37.
4.13 Laboratory Maintenance
Trash is taken out weekly, or more often as needed. Plastic bag opening is tied
closed and bag is disposed of in the dumpster in the back of the laboratory building.
Line cans with plastic bags.
Floors in all labs are swept weekly and damp-mopped monthly, or more often as
needed. High use areas (e.g. labs 10, 35 and 37) are mopped weekly. Do not use
cleansers in the laboratories.
All surfaces (work bench surfaces, window ledges, shelving, etc.) are wiped
down at least once every three months.
Wall racks are disassembled and washed yearly.
5.0 SAMPLE CUSTODY, PREPARATION, AND PRESERVATION
5.1 Sample Custody
Samples are logged into the login notebook after arrival at the Laboratory, and
assigned a Laboratory sample number. Table 5.1 contains the form for this initial login
and tracking of sample processing. Samples are numbered with the format "YPnnn,"
where Y = the last digit of the year, P = the project code, and "nnn" are consecutive
numbers beginning with 001. All samples within each project are numbered
consecutively, including field duplicates and filter blanks. Each project has a separate
login sheet, with an assigned sample number series.
For example, the numbers for FY2001 were:
11 nnn Western Pilot Study (EMAP)
12nnn Ecoindicators
125nn EcoLysimeters
13nnn Salmon River
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Table 5.1 WRS Analytical Laboratory: Sample Processing and Tracking Information
Analyst /
Filter Lot
Lab
sample #
(YPNNN)*
Site ID
Bar Code
Coll
Date
Rec
Date
Filter
Date
Acid
Date
pH Date
Turb
Date
Color
Date
Cond
Date
ANC
Date/Check
TS
Date/Check
TSS
Date/Check
Y=Year, P=Project**; NNN=Sequential Sample Number
"Project codes 1=WPS, 2=Salmon Barrier, 3=Salmon/Nesk , 325=Salmon Pen , 35=Salmon Comp , 4=Salmon Lysimeters,
5=Salmon Streamwater, 6=WACAP. 65=Estuary Processes. 7=Time, 8= unassigned, 9=WPS Fish, QA=NWRI, NIVA, PE, Salmon QA
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14nnn Salmon River Lysimeters
15nnn Stream and Groundwater
16nnn Soil Solutions
17nnn TIME Samples (EMAP)
19nnn WPS Fish (EMAP)
QAnnn QA performance evaluation samples
Samples are initially stored in the walk-in cold room or in the refrigerator in lab 1
at 4°C. Aliquots are prepared in lab 10, including filtering and acidifying. Aliquot bottles
are moved to the appropriate lab for analysis, with all but the cation aliquot (acidified
with HNO3) stored in a refrigerator. Cubitainers are stored in the refrigerator in lab 10 or
the walk-in cold room during analyses of unfiltered, unacidified samples (e.g., specific
conductance, ANC). The walk-in cold room (4°C) is used to store all cubitainers and
aliquot bottles when analyses and data validation are completed. Previous years'
samples are moved to a second cold room at 4°C. Two years old and older samples
are stored at room temperature. Samples are discarded only after receiving written
approval from the EPA Work Assignment Manager.
5.2 Sample Processing and Preservation
Each project specifies the aliquots required by the analyses that are requested.
Most samples have at least one filtered aliquot. A sample processing schedule is
developed that specifies all aliquots required for each project. Table 5.2 lists the
aliquots collected for each project using FY2001 as an example (schedules for previous
years' data are stored in WRS data folders on the Zeus Site File drive. A waterproof,
Nalgene™ label is attached to each aliquot bottle with the following information:
Analyses to be run on the aliquot
Project name
Lab Sample number (YPnnn)
Date of filtering
The analyses and project name are preprinted on the label, and the Laboratory sample
number and date of filtering are added in ink as the aliquots are prepared.
Chlorophyll a samples are usually filtered in the field, with the filter placed in a
labeled centrifuge tube and stored on ice until arrival at the Laboratory. If the samples
arrive at the Laboratory on the same day as collected, they are filtered as soon as
possible after arrival. A known quantity of sample (usually 500 ml) is filtered through
one Whatman 0.7 urn glass-fiber filter, keeping the vacuum pressure to 15 psi or less.
The filter in the centrifuge tube is stored in the freezer at -20°C ± 2°C for up to 30 days
before analysis.
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Table 5.2 WRS Analytical Laboratory: Annual Sample Processing Schedule (Example from FY2001)
Aliquot No.:
Aliquot
Container:
Processing:
Western Pilot
Study
11nnn
Ecolndicators
12nnn
EcoLysimeters
125nn
Salmon River
13nnn
Salmon
Lysimeters
14nnn
Salmon Stream &
Groundwater
15nnn
Soil Solutions
16nnn
TIME Samples
17nnn
WPS Fish
19nnn
1
120 ml or2x60ml
Square
Filtered, Acidified
with HNO3
Cations (Na, K, Ca,
*Mg, Zn, Se)
X
X
Cations (Na, K, Ca,
Mg)
X
X
X
Cations (Na, K, Ca,
Mg, Al)
X
2
125ml Round
Filtered, No acid
Si02, Anions,
True Color
NH3. N02-N03
NH3l N02-NO3
NH3, NO2-NO3l SRP,
Si02, SO4, Cl
NH3, NO2-NO3, Cl
NH3l NO2-NO3,
SRP, Cl
DOC, DIG, NH3,
NO2-NO3
SiO2, Anions,
True Color
X
3
125ml Rectangular
Filtered, Acidified
with H2SO4
NH3, DOC
DOC, Total Nitrogen
DOC, Total Nitrogen
DOC, Total Nitrogen
Total Nitrogen
DOC, Total Nitrogen,
Total Phosphorus
Total Nitrogen, Total
Phosphorus
NH3, DOC
X
4
125ml Rectangular
Unfiltered, Acidified
with H2SO4
Total Nitrogen, Total
Phosphorus
X
X
X
X
X
X
Total Nitrogen, Total
Phosphorus
X
Syringe and Unfiltered Aliquots:
Syringe - pH, DIC
Unfiltered - ANC, Conductivity, Turbidity,
TSS
Syringe - DIC
Unfiltered - Conductivity
Syringe - pH, DIC
Unfiltered -ANC, Conductivity. TSS
(Samples prefiltered, need preservation)
Syringe - pH, DIC, Aluminum
Unfiltered - ANC, Conductivity, Turbidity,
TSS
Mercury
X = aliquot not collected
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All other filtered aliquots are filtered through Nucleopore™ 0.4|jm pore size
polycarbonate filters within 48 hours of arrival at the Laboratory. Magnetic vacuum
filter funnel units are rinsed thoroughly with RO water five times before each use, and
in between samples. After placing a filter in the funnel unit, approximately 100 ml of RO
water is run through the filter, with vacuum pressure, to rinse the filter. The RO rinse
water is discarded, then the appropriate sample bottle is placed under the funnel unit
and sample is filtered directly into the bottle. If a new filter is needed, the sample bottle
is removed, and the new filter is rinsed with 100 ml of RO water before continuing
sample filtration.
Filter blanks are collected approximately once every 100 filters by filtering
Millipore-water into each type of sample container. Filters are packaged 100 to a box,
and a filter blank is prepared using a filter from a new box prior to using the new box of
filters for samples. Results from this filter blank are reviewed before the new box of
filters is used for samples. New filter lot numbers are recorded with the filter date on
the sample tracking sheet (Table 5.1). In addition, bottle blanks are collected whenever
filter blanks are collected by pouring Millipore-water into a sample bottle without
filtering.
After all filtered and unfiltered aliquots are collected, ultra-pure acid (HNO3 or
H2SO4, depending on the analyte) is added to the sample in the aliquot container under
the hood. Aliquot containers are then taken to the appropriate lab for analysis. All
except the cation aliquot (filtered, acidified with HNO3) are stored in a refrigerator at
4°C.
5.3 Sample Tracking
The Laboratory Manager prepares a master tracking sheet for each year that
includes all analyses and holding times for each project. Table 5.3 contains, as an
example, the master tracking sheet for FY2001. A sample tracking sheet (Table 5.4) is
started for each project to track all analyses for each sample. Dates when each
preparation or analysis step is completed are added to the sheet, so each sample can
be monitored to assure that holding times are being met for each analyte. The holding
time is the time between sample collection and analysis, and is usually established by
each project. However, for Laboratory tracking purposes, the Laboratory holding times
begin with the day the sample is filtered in the Laboratory, which is usually the day the
sample is received. EMAP-required holding times are provided in Table 5.5.
6.0 CALIBRATION AND ANALYTICAL PROCEDURES
Standard Operating Procedures (SOP) for each analysis at the WRS Analytical
Laboratory are available as separate documents, and are listed in Appendix A.
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Table 5.3 WRS Analytical Laboratory: Annual Master Tracking Sheet (Example from FY2001)
Project Code
1
2
2
3
4
5
6
7
QA
QA
QA
Hofding Yimes
(EMAP)
Sample
Preparation*
Instrumentation
Work Group
Western Pilot
Study (WPS)
Ecolndicators
(Ecol)
EcoLysimeters
(EcoL)
Salmon River (SR)
Salmon
Lysimeters (SL)
Salmon Stream &
GW (SSG)
Soil Solutions
TIME
NWRI
NIVA
PE Samples
ANALYSES
i i
- i L
£ I I !c
1
48h | 72h j 7d
| syg j u
1 1
1 1
o 1 co
z •= ! co
i
|rrf
!
u u u
_
•§
0
_____
3d
f
I
vanous
i i
x 1 x ix
A , A , A
1 1
x 1 x
XXX
x
!
j
x i
X j X X
! x x
!
i x x
•
XXX
|
XXX
1
1
X j X
1 1 1
! !
i
!
1 1
: i
i x i x x
! y ! Y
i A l A
i |
_»_-
i i
6m | 6m j 6m
fn
fnjfn
i i
i i
i
f |fi 1
1
i i
6m | 6m 6m
0)
U.
6m
i
1
i
? i °>
^ i CO
i
6m |6m
' -
fn i fn fn fn j fn | fn
Perkm-Elmer AAS/GFAAS
X
X
X
X
i
"xTx"
A , A
1
1
i i !
x ! x
1
II 1
x i x i x i
i
1
il 1
i i
, : : :
! ! !
i
i
x j x
x | x
1 1
X j X j X
X
xjx
: i
! !
1 I
x i
— 1 1 1
x 1
x i x
xlx
!
-I
i
lx
i
i
i
i i
I !
1 1
i Y i
i X j
1
|
x i x i
1 1
i 1*
'Abbreviations
f = filtered n = preserved with nitnc acid
u = unfiltered syg = syringe
s = preserved with sulfunc acid
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Table 5.4 WRS Analytical Laboratory: Sample Tracking Sheet
Work
Group
Sample
Series
Collect
Date
Analysis
Filter
PH
Cond
ANC
Turb
TSS
Color
DOC
DIG
Chl-a
NH3
SRP
NO3
SiO2
TN/P
Al
An"
Cat*
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Table 5.5 Examples of Holding Times
Analyte
Laboratory Holding Time*
pH
Specific Conductance
Acid Neutralizing Capacity (ANC)
Turbidity
Dissolved Organic Carbon (DOC),
preserved with H2SO4
Dissolved Inorganic Carbon (DIC)
Ammonia nitrogen
Nitrate/nitrite nitrogen
Silica
Total Nitrogen & Total Phosphorus,
until digestion
Anions (nitrate, chloride, sulfate)
Anions (chloride and sulfate only)
Cations (Ca, Mg, Na, K, Fe)
72 hours
7 days
7 days
3 days
14 days
72 hours
48 hours
7 days
7 days
28 days
7 days
28 days
6 months
*from the EMAP project
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Calibration and analytical procedures are described in the SOP for each analyte. The
SOPs describe current protocols and include data forms, and are revised as needed
when methods are updated. General laboratory procedures are described below.
6.1 Balance and Pipette Calibration
Analytical balances are checked with a certified weight set prior to each use.
Pipette calibrations are checked prior to each use by weighing a dispensed volume of
RO water on an analytical balance. Weight checks are recorded on forms used for
standard preparation (see Tables 6.2.1 and 6.2.2). Balances and pipettes are not used
if the calibration check exceeds 2% of the expected value. The Laboratory Manager is
notified when a balance or pipette fails a calibration check.
6.2 Calibration Standard Preparation
Stock standards for instrument calibrations are bought as high-concentration
(100 or 1000 ppm or greater), NIST-traceable standards, in liquid form. The high-
concentration stock standards are diluted to lower concentration intermediate standards
following the procedures listed on the Standard Preparation Log Sheet (Table 6.2.1).
Working standards for instrument calibrations are prepared from dilutions of the
intermediate standards or dilutions directly from the lower concentration stock
standards, following the procedures listed on the Working Standard Preparation Log
Sheet (Table 6.2.2). Balance weight checks and pipette calibration checks are
performed and recorded each time intermediate and working standards are prepared.
In addition, the weight of the actual volume dispensed for each standard is recorded on
the form. If the weight of the dispensed standard is greater than 5% difference from the
expected value, the pipette calibration is rechecked.
Each standard is assigned a WRS Standard Number, which is the 6 digits from
the date of preparation, followed by a dot with the consecutive numbers of the
standards prepared that day. For example, 092099.1 is the WRS Standard Number for
the first standard prepared on September 20, 1999. This number allows each standard
to be traced back to lot numbers of the stock standards.
6.3 Calibration and Run Procedures for FIA, 1C, AAS, and Carbon Analyzer
Each analytical instrument is calibrated for each analytical run with 4 to 6
calibration standards. A second source check standard (SSCS) is analyzed after the
calibration standards and after every 10 samples, followed by a blank. This check
standard is prepared from a source or lot different than the source used for the
calibration standards. Each analysis of the check standard must be within 10% of the
theoretical value (or within a percentage specified by the project) to accept the previous
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Table 6.2.1 Standard Preparation Log Sheet
WRS Analytical Laboratory
STANDARD PREPARATION LOG SHEET
STANDARD
FINAL CONCENTRATION
as
WRS STANDARD NUMBER
CHEMICAL NAME
MANUFACTURER
PREPARED FROM
CHEMICAL ID/LOT # NUMBER
PREPARATION DOCUMENTATION
Balance Identification
Balance weight set and wt used (g)
Weight of balance weight (g)
Standard preparation for solids
Theoretical weight of standard (g)
Actual weight of standard (g)
Final Volume (ml)
Pipette performance check
Pipette identifier
Volume of RO water pipetted (ml)
Weight of RO water pipetted (g)
Standard preparation for liquids
Volume of standard aliquot (ml)
Weight of standard aliquot (g)
Final volume (ml)
Comments
ANALYST/ DATE PREPARED
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Table 6.2.2 Working Standard Preparation Log Sheet
WRS Analytical Laboratory
WORKING STANDARD PREPARATION LOG SHEET
STANDARD
PREPARED FROM STANDARD*
CONCENTRATION OF STOCK STANDARD
EXPIRATION DATE FOR STOCK STANDARD-
PREPARATION DOCUMENTATION
Balance Identification
Balance weight set# and wt used (g)
Weight of balance weight (g)
Pipette performance check
Pipette identifier
Volume of RO water pipetted (ml)
Weight of RO water pipetted (g)
Working standards
Volume of standard
pipetted (ml)
Weight of standard
pipetted (g)
(optional)
Final standard solution
volume (ml)
Final concentration of
standard (mg/L)
as
•
Comments
ANALYST/ DATE PREPARED
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sample data. In addition, a detection limit sample and a bulk quality control check
sample (see sections 6.5 and 7.2, respectively) are analyzed once each run. At the end
of the run, a subset of the calibration standards are reanalyzed to check for instrument
drift, and if the standards are not within 10% of the known concentration, the samples
are re-run.
Each instrument has a run log that lists the run number, sample numbers,
analyst, date, and comments about the run. Table 6.3 provides an example of a run
log.
6.4 Calibration and Run Procedures for pH, ANC, and Specific Conductance
The pH meter and the ANC titrator are calibrated with two pH standards. The
conductivity meter is calibrated with one standard, and checked with one or two
additional standards. A quality control check sample (QCCS) (see section 7.3) is
analyzed at the beginning and end of each run, and approximately after every 10
samples. The QCCS must be within 10% of the theoretical value to accept the previous
sample data.
6.5 Method Detection Limit
Method detection limit (MDL) is defined as the minimum concentration of an
analyte that can be measured and reported with 99% confidence that the analyte
concentration is greater than zero (U.S.EPA, 40CFR136, app. B). The MDL is
determined by repeated measurements of a low concentration detection limit standard
that is typically five times the expected detection limit. In addition, the detection limit
standard for total nitrogen and total phosphorus is subjected to all steps of sample
preparation, including digestion. At least seven measurements are required for the
calculation of the MDL. MDL is calculated as:
MDL = t*s
t = student's t value at a significance level of 0.01 and n-1 degrees of freedom
s = standard deviation of at least seven repeated measurements of the detection
limit standard
A detection limit standard is included in each run on most analytical instruments.
Results from these analyses can then be used to calculate the MDL over a specific time
period. Every six months a set of seven repeated measurements are analyzed in the
same batch on each analytical instrument to calculate the instrument detection limit
(IDL).
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Table 6.3 Example of a Run Log for an Analytical Instrument
FIA Run Log
Run Number
Sample ID
Analyte
Analyst
Comments
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7.0 INTERNAL QUALITY CONTROL CHECKS
Four types of internal quality control samples and three types of duplicates are
routinely used at the WRS Laboratory. These samples are summarized here, and
described in sections 7.1 to 7.6. Miscellaneous quality control checks are described in
section 7.7.
The quality control samples used are:
1) A second source check standard (SSCS) is analyzed once every 10 samples;
2) A bulk surface water quality control check sample (QCCS) is analyzed once
in each run;
3) A synthetic QCCS is analyzed at least twice in each run of pH, conductivity,
and ANC samples, and once in each run of TSS samples.
4) A detection limit standard is analyzed once in each run on the FIA, 1C, AAS,
and carbon analyzer (see section 6.5).
The duplicates used are:
1) Laboratory duplicates are prepared once every 20 samples, when there is
enough sample volume.
2) Analytical duplicates are prepared once every 10 samples, when there is
enough sample volume.
3) Field duplicates are collected as separate samples by the project field crews
at a suggested rate of at least one per 20 samples.
7.1 Second Source Check Standard (SSCS)
A second source check standard (SSCS) is analyzed after each calibration on
the FIA, 1C, AAS, and carbon analyzer, and once every 10 samples thereafter. This
check standard is prepared from a NIST-traceable standard different than the source or
lot used to prepare the calibration standards. The concentration of the SSCS is in mid-
range of the calibration, and a blank is analyzed after each SSCS to assure there is no
carryover. Each analysis of the check standard must be within 10% of the theoretical
value (or within a percentage specified by the project) to accept the previous sample
data.
7.2 Quality Control Check Samples (QCCS)
A bulk QCCS prepared from a natural water source is used as a consistency
standard and is analyzed at least once in each run. This QCCS can be used to
estimate batch-to-batch precision and to track batch-to-batch comparability. A large
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quantity of surface water is collected at one time, then filtered and stored in the walk-in
cold room. Control charts are maintained for each instrument, with one and three
standard deviations marked on the chart. If a result is outside three standard
deviations, the run is stopped. DIG and NH4 concentrations will dissipate over time, so
the standard deviations are recalculated regularly.
7.3 QCCS for pH, Conductivity, ANC, and TS
A dilute, circumneutral QCCS for pH, conductivity, and ANC is prepared from a
phosphate standard and buffer solution according to Metcalf and Peck, 1993. Large
batches of the QCCS are prepared by diluting the stock solution by weight. The QCCS
has a theoretical pH of 6.98, specific conductance of 75.3 uS/cm, and ANC of 250
ueq/L This QCCS is measured at least twice per run, at the beginning and end, and if
more than 10 samples in the run, once every 10 samples. QCCS results for each
analyte are summarized once a year.
The QCCS is also used as a check standard for total solids (TS). It is analyzed
once with each run. The average value for TS is 69.0 mg/L.
7.4 Laboratory Duplicates
A laboratory duplicate is collected once every 20 samples by filtering a second
set of aliquots, when there is enough sample volume. If a project will not have enough
sample volume to collect laboratory duplicates, the project is encouraged to collect field
duplicates and additional syringes (for pH and DIC) to bring the number of duplicates
up to 10%. A "D" is added to the sample number to denote the lab duplicate. This type
of duplicate estimates the precision of the sample preparation and analytical processes.
There are no laboratory duplicates from syringe samples for pH and DIC.
7.5 Analytical Duplicate
An analytical duplicate is a sample that is poured from the same aliquot
container for a second analysis during the same run. If the instrument has an
autosampler, the sample is poured into a second sampling tube. Analytical duplicates
are analyzed every 10 samples, when sample volume permits. This type of duplicate
estimates precision of the analytical process. There are no analytical duplicates from
syringe samples for DIC.
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7.6 Field Duplicate
A field duplicate is a sample that is collected immediately after the regular
sample at the same site. This type of co-located field duplicate estimates precision of
the whole sampling process, including variability inherent at the field site, as well as
variability from sample processing and analysis. Projects are encouraged to collect
field duplicates at a rate of one per 20 samples. If a project will not have enough
sample volume to prepare laboratory and analytical duplicates, the project is
encouraged to collect field duplicates and additional syringes (for pH and DIG) to bring
the number of duplicates up to 10%.
7.7 Miscellaneous Laboratory Quality Control Procedures
Temperatures of all laboratory refrigerators, freezers, and the walk-in cold room
have thermometers to confirm the actual temperatures. At a minimum, the
temperatures are read and recorded three times per week. A form is attached to each
refrigerator and freezer door to record the actual temperature observed. If the
temperature is not within the acceptable limits posted on the form, the Laboratory
Manager is notified to begin corrective action. Samples will be moved from the
refrigerator to another refrigerator with an acceptable temperature until the problem is
corrected.
8.0 CALCULATION OF DATA QUALITY INDICATORS
The precision and accuracy objectives use an absolute value for lower
concentration ranges, and a relative value at higher concentration ranges, thus
reducing the problem of unreasonable objectives for low analyte concentrations. A
concentration range is specified for each variable to determine whether the absolute or
the relative term applies (see Table 3.0).
The precision objective is based on the standard deviation (s) for the absolute
term at the lower concentrations, and the percent relative standard deviation (%RSD)
for the relative term at the higher concentrations:
%RSD = - * 100
where x, is an individual measurement, and x is the mean of the set of
measurements.
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Some projects prefer to use differences instead of the standard deviation when
duplicates are used to estimate precision. If this calculation is preferred, then the
difference between the two measurements is used for the absolute term at the lower
concentrations, and the relative percent difference (RPD) is used for the relative term at
the higher concentrations:
If the difference and RPD are used to estimate precision, then the precision
objectives listed in Table 3.0 need to be modified so they are based on the difference
and the RPD. This modification is done by multiplying the objectives in Table 3.0
(based on the standard deviation) by the square root of 2 (Chaloud and Peck, 1994).
For accuracy, the objective is based on the difference between the measured
and target value of a sample in the lower concentration range, and as the percent
difference in the higher concentration range. For repeated measurements of the same
sample, the net bias is calculated by the difference between the mean of the repeated
measurements and the target value in the lower concentration range, and by the
percent difference between the mean and the target values in the higher concentration
range.
9.0 DATA REDUCTION, VALIDATION, AND REPORTING
A data package cover sheet (Table 9.0) is prepared for each analytical run. The
data package includes all raw data printouts and data sheets, including chromatograms
where applicable.
Databases for each project are in Excel spreadsheet format. Some analytical
instruments in the Laboratory export data in spreadsheet format (e.g., 1C, AAS), while
other instruments summarize data in reports (e.g., FIA, carbon analyzer, ANC titrator)
from which data are entered into the database. Raw data for analyses that are not
controlled by computer software (e.g., pH, conductivity, turbidity, TS, and color) are
collected on data sheets, then the Laboratory Manager enters the data into a
spreadsheet. The Laboratory Manager checks each batch for QC and QA data, and
confirms that all QA objectives have been met for each batch. Corrections on all data
forms are by single strikeout, in pen only, and initialed. No whiteout is used.
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Table 9.0 WRS Analytical Laboratory: Data Package Cover Sheet
DATA PACKAGE COVER SHEET
Analyte
Run Number
Samples
Analyzed
Calibration
Comments
Sample
Comments
Misc. Info
Analyst / Date:
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A draft database, which includes all data, duplicates, and sample information, is
assembled for each project in Excel format. The verification process begins with having
another analyst check each result against the original data printout. Validation
procedures include the following calculations for each sample:
1) Calculated ANC compared to measured ANC should be within 15%;
calculated ANC uses DIC and pH values.
2) Percent ion balance difference should be less than or equal to 5% for
samples with total ionic strength greater than 100 u.eq/L, or less than 20% for
samples with total ionic strength less than or equal to 100 u.eq/L (if all major
anions and cations are analyzed). Percent ion balance is calculated as
follows:
CatSum-AnSum * 100
(CatSum + AnSum)
where CatSum = Ca + Mg + K + Na + NH4 + H
AnSum = ANC + H + Cl + NO3 + SO4
with concentrations in ueq/L
3) Theoretical conductivity should be within 10% of the measured conductivity,
calculated as follows:
((Ca*59.47) + (Mg*53.0) + (KV3.48) + (Na*50.08) + (NH4*73.5) + (H*349.65)
+ (SCV80.0) + (Cl*76.31) + (NO3*71.42)
+ ((ANC+H-OH)*44.5) + (OH*198.0)) /1000
where concentrations are in ueq/L
4) Total N concentration should be greater than the sum of NH4-N and NO3-N
5) Total monomeric aluminum concentration should be greater than the organic
monomeric aluminum concentration.
Data are reported to projects in Excel format. Draft databases are reported at
the end of each fiscal year, or if requested, monthly. Validated databases follow after
all checks and reruns are completed. Summaries of QA and QC data are prepared
when requested.
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10.0 PERFORMANCE AND SYSTEM AUDITS
The WRS Laboratory participates in two international performance evaluation
studies, the Canadian National Water Research Institute's (NWRI) Ecosystem
Interlaboratory QA Studies, and the Norwegian Institute for Water Research (NIVA)
Intercalibration Studies. NWRI distributes two studies per year, and NIVA distributes
one study per year.
The NWRI studies provide three sets of 10 samples in each study. The rain and
soft water set contains natural water samples with conductivity less than 100 uS/cm, the
major ion set contains water samples with conductivity greater than 100 uS/cm, and the
third set contains acidified samples for analysis of total phosphorus. The samples in
each set cover a range of concentrations. Thirty to 50 laboratories participate in each
study, and a median value is determined for each variable for each study. Flags, from
extremely low to extremely high, are then assigned to each sample for each variable
whose reported value is outside the acceptable limits for difference from the median
value. Laboratory rankings of the results from the 10 samples in each study are used
to identify bias for each variable for each laboratory. Bias classes (from slightly low to
high) are assigned to a variable based on the procedure described by Youden (1969).
A summary sheet is prepared for each laboratory after a study, indicating the
results (flags, and if ranking indicates a bias) for each variable. If a variable is flagged,
or a bias is indicated, the first check is to confirm that the values were reported
correctly, and that there were no transcription or unit conversion errors. Results are
discussed with the analyst to identify the source of flagged results (e.g., calibration
errors, pressure leaks, old electrodes, or errors in calibration standards).
The NIVA Intercalibration Study also uses a nonparametric method of Youden
(1959, 1975) that uses two samples to graphically represent random and systematic
errors. Results for one sample are plotted against the second sample, with the
distance along the 45° line indicating the magnitude of systematic error, and the
distance perpendicular to the 45° line indicating the magnitude of the random error.
The NIVA study usually includes major anions and cations, plus pH, conductivity, and
ANC. Special variables are sometimes included, such as Al species.
System audits are scheduled by the WED QA staff. Frequency of audits is
determined by the WED QA staff, but is typically once per year.
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11.0 REFERENCES
Chaloud, D.J. and D.V. Peck (Eds.). 1994. Environmental Monitoring and Assessment
Program: Integrated Quality Assurance Project Plan for the Surface Waters
Resource Group, 1994 Activities. EPA 600/X-91/080, Rev. 2.00. U.S.
Environmental Protection Agency, Las Vegas, Nevada.
Dynamac Corporation. 2001. Program Quality Management Plan for the WED-
Corvallis and Newport, Oregon On-Site Technical Support Contract 68-D-01-005,
Revision 0. Corvallis, OR
Metcalf, R.C., and D.V. Peck. 1993. A dilute standard for pH, conductivity, and acid
neutralizing capacity measurement. Journal of Freshwater Ecology 8:67-72.
U.S. EPA. Definition and procedure for the determination of the method detection limit-
revision 1.11. 40CFR136, appendix B.
U.S. EPA. 1995. Quality Management Plan for WED. National Health and
Environmental Effects Research Laboratory. Western Ecology Division,
Corvallis, OR
Youden, W.J. 1959. Graphical Diagnosis of Interlaboratory Test Results. Industrial
Quality Control, pp 15-24.
Youden, W.J. 1969. Ranking laboratories by round-robin tests. In Precision
Measurement and Calibration. H.H. Ku, ed. NBS Special Publication 300, Vol. 1.
U.S. GPO Washington, D.C.
Youden, W.J., E.H. Steiner. 1975. Statistical Manual of the Association of Official
Analytical Chemists. Statistical Techniques for Collaborative Tests. Arlington.
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Appendix A: List of Standard Operating Procedures for the
Willamette Research Station Analytical Laboratory
Standard Operating
Procedure
Basic Determinations:
Determination of pH
(Closed System)
Determination of Specific
Conductance
Determination of Acid
Neutralizing Capacity
WRS
Method
Number
WRS10A1
WRS11A1
WRS12A1
Date of Initial
Version
April 2001
March 2000
April 2001
Date of
Revision 1
October 2002
December 2002
October
2002
(Alkalinity)
Determination of Turbidity WRS 13A 1
Determination of Total WRS 14A 1
Solids (Total Residue)
Determination of Total WRS 14B 1
Suspended Solids (Non-
Filterable Residue)
Determination of True Color WRS 15A 1
April 2001 December 2002
September 1999 December 2002
January 2001 December 2002
April 2001 December 2002
Carbon Analysis:
Analysis of Dissolved
Inorganic Carbon
Analysis of Dissolved
Organic Carbon
WRS 20A 1 September 1999 December 2002
WRS 21A 1 September 1999 December 2002
Flow Injection Analysis,
Colorimetric:
Determination of Ammonia
in Fresh Waters
Determination of
Nitrate/Nitrite in Fresh
Waters
Determination of Silicate in
Fresh Waters
Determination of Soluble
Reactive Phosphorus in
Fresh Waters
WRS 30A 1
WRS 31A 1
WRS 32A 1
WRS 33A.1
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May 1998 March 2003
May 1998 March 2003
May 1998 March 2003
May 1998 March 2003
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Standard Operating
Procedure
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Method
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Date of Initial
Version
Date of
Revision 1
Digestion and Analysis of WRS 34A 1
Fresh Water Samples for
Total Nitrogen and Total
Phosphorus
Determination of Total WRS 35A.1
Monomenc and Organic
Monomenc Aluminum in
Fresh Waters
April 2000 December 2002
March 2000 December 2002
Ion Chromatography:
Determination of Chloride,
Nitrate and Sulfate by Ion
Chromatography
WRS 40A 1
March 2000 October 2002
Atomic Absorption:
Determination of Metal
Cations in Natural Waters
by Flame Atomic Absorption
Spectroscopy
Determination of Metals by
Graphite Furnace Atomic
Absorption Spectroscopy
WRS 50A 1 September 1999 March 2003
WRS 51A 1
April 2001 March 2003
Mercury Analysis:
Preparation and Digestion WRS 60A 1
of Fish Tissue for Mercury
Analysis
Direct Analysis of Mercury WRS 61A 1
in Fish Tissue
June 1999 December 2002
in process March 2003
Periphyton Analysis:
Determination of
Chlorophyll a
Determination of
Acid/Alkaline Phosphatase
Activity
Determination of Ash-Free
Dry Mass
WRS 71A 1 March 2000 October 2002
WRS 72A1 April 2001 December 2002
WRS 73A1 April 2001 December 2002
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