TECHNICAL MEMORANDA
Number Date/Subject/Author
=====================================================================================
03-01 February 28, 2003
Data-reporting conventions and implications for interpreting
results from custom method 9060 for samples collected from
March 1, 1999, to December 31, 1999
Edward T. Furlong, MRDP, NWQL (303)236-3941;
Joel Blomquist, Pesticide National Syntheses Team NWAQA, USGS
Robert J. Gilliom, USGS
02-04 Septemer 23, 2002
Requirements for the proper shipping of samples to the
National Water Quality Laboratory
Will Lanier, Chief, Support Services Section, NWQL
(303) 236-3710, email wdlanier@usgs.gov
02-03 August 12, 2002
Permanent application of the Estimated (E) Remark Code for
Malathion and Disulfoton data reported by Lab Schedule 1319
(Organophosphate Pesticides in Water)
Duane Wydoski, GC/Waters Unit Supervisor, Analytical Services, NWQL
(303) 236-3240, email dwydoski@usgs.gov
02-02 May 22, 2002
Revision of the Procedure Used to Calculate Concentrations
of Chlorophyll a and b in Phytoplankton and Periphyton
by High-Performance Liquid Chromatography
Ronald W. Brenton, Analytical Services, NWQL
(303) 236-3210, email rbrenton@usgs.gov
02-01 April 26, 2002
Removal of Terbuthylazine from Pesticide Analysis by
Gas Chromatography/Mass Spectrometry (Methods 2001 abd 2010)
Christopher Lindley, Analytical Services, NWQL
(303) 236-3272, email clindley@usgs.gov
01-05 December 26, 2001
Establishment of Long-Term Method Detection Levels
for the Analysis of Oil and Grease
Ronald W. Brenton, Analytical Services, NWQL
(303) 236-3210, email rbrenton@usgs.gov
01-04 November 7, 2001
Results for Filtered and Whole-Water Recoverable
Aluminum and Zinc by ICP-MS Affected by Contamination
from May 2000 through September 2000
Tedmund M. Struzeski, Analytical Services, NWQL
(303) 236-3191, email struzesk@usgs.gov
01-03 April 27, 2001
Change in the Long-Term Method Detection Level and the
Laboratory Report for Total Recoverable Phenol Analyses,
because of Excessive Variability
Ronald W. Brenton, Analytical Services, NWQL
(303) 236-3210, email rbrenton@usgs.gov
01-02 April 1, 2001
Recalculation of bromide concentration (lab code 1246)
Pat Pavelich, Analytical Services Section, NWQL
(303) 236-3165, email pavelich@usgs.gov
01-01 May 8, 2001
Elimination of National Water Quality Laboratory Blank Schedule 172
(Effective June 1, 2001)
Glenda E. Brown, Supervisory Chemist, Majors Unit, NWQL
(303) 236-3160, email gebrown@usgs.gov
00-07 October 1, 2000
Elimination of Lead Analysis by Inductively Coupled Plasma-
Optical Emission Spectrometry
Edward J. Zayhowski, Supervisory Chemist, Plasma Unit, NWQL
(303) 236-3180, email zayhowsk@usgs.gov
00-06 October 1, 2000
Elimination of Orthophosphate and Nitrate Analysis
by Ion Chromatography
Gary Cottrell, Nutrient Unit Supervisor, Inorganic Program, NWQL
(303) 236-3490, email cottrell@usgs.gov
00-04 July 25, 2000
Hach Turbidimeter 2100AN to replace Hach Turbidimeter 2100A
for determination of turbidity in raw unfiltered water.
Glenda E. Brown, Supervisory Chemist, Majors Unit, NWQL,
(303) 236-3160 (gebrown@usgs.gov)
00-04S July 25, 2000 - Supplementary Information
Hach Turbidimeter 2100AN to replace Hach Turbidimeter 2100A
for determination of turbidity in raw unfiltered water.
Glenda E. Brown, Supervisory Chemist, Majors Unit, NWQL,
(303) 236-3160 (gebrown@usgs.gov)
00-03 March 8, 2000
Changes in Minimum Reporting Levels for Suspended
Solids Analyses at the NWQL (Lab Codes 49 and 169).
Gary Cottrell, Nutrient Unit Supervisor, NWQL,
(303) 236-3490 (cottrell@usgs.gov)
00-02 February 17, 2000
Re-release of Total Phosphorus (labcodes 1983, 1984, 1992)
data for results from 10/01/98 to 01/21/99
Gary Cottrell, Inorganic Program, NWQL,
(303) 236-3490 (cottrell@usgs.gov)
00-01 January 7, 2000
Update on blank correction omission for Kjeldahl nitrogen and
phosphorus test on samples sent to the National Water Quality
Laboratory
Gary Cottrell, Inorganic Program, National Water
Quality Laboratory, (303) 236-3490 (cottrell@usgs.gov)
This document is also available in MS Word format.
00-01S January 7, 2000 - Supplementary Information
Analysis and interpretation of reporting environmental data
with a non-proper calibration curve for Kjeldahl nitrogen
and phosphorus methods
Jeff Pritt, National Water Quality Laboratory
(303) 236-3475 (jwpritt@usgs.gov)
This document is also available in MS Word format.
99-10 December 17, 1999 [Memo distributed March 9, 2000]
Consolidation of aroclor 1016 and aroclor 1242 in lab schedules 1608
(NPDES organochlorine pesticides with individual PCB aroclors in water)
and 1364 (individual PCB aroclors in water)
99-09 December 17, 1999 [Memo distributed March 9, 2000]
Removal of Two Constituents from Lab Schedules 1324 (Organochlorine
Pesticides in water and 1398 (Low-Level Organochlorine Pesticides
in water) and Addition of One or Two Surrogates to Lab Schedules 1324,
1364 (Polychlorinated Biphenyls in Water), 1398, and 1608
(Organochlorine Pesticides in Storm Water Run-off)
Leslie Kanagy, Organic Program, National Water
Quality Laboratory, (303) 236-3243 (lkkanagy@usgs.gov)
99-08 November 1, 1999
Method Change for the Determination of Phytoplankton Biomass
Ronald W. Brenton, Organic Program, National Water
Quality Laboratory, (303) 236-3210 (rbrenton@usgs.gov)
99-07 May 12, 1999
New Analytical Services Request Procedures for National
Water-Quality Assessment Program Invertebrate Samples
Shipped to the National Water Quality Laboratory
Stephen R. Moulton II, Supervisory Biologist, National Water
Quality Laboratory (303) 236-3493 (smoulto@usgs.gov)
Robert S. Williams, Jr, Chief, National Water Quality Laboratory
(303) 236-3500 (bobwill@usgs.gov)
Timothy L. Miller, Chief, National Water Quality Assessment
Program (703) 648-6868 (tlmiller@usgs.gov)
99-06 July 7, 1999
Change in the Parameter Code Used to Report Results for
Chloramben Herbicide
Ronald W. Brenton, Organic Program (303) 236-3210 (rbrenton@usgs.gov)
99-05 January 7, 1999
Validation of U.S. Environmental Protection Agency (USEPA)
method 365.1 to replace U.S. Geological Survey (USGS) TWRI
methods I-2607-90 and I-4607-90 for determination of phosphorus
in the concentration range from 0.004 to 0.200 mg-P/L.
Juan Vasquez, Supervisory chemist, Nutrients Unit,
Inorganic Chemistry Program, (jvasquez@usgs.gov, 303-236-2000)
Charles Patton, Research Chemist. Methods Research
and Development Program, NWQL, (cjpatton@usgs.gov, 303-236-2000)
99-04 April 8, 1999
Inductively Coupled Plasma - Optical Emission Spectrometry
to replace Flame Atomic Absorption Spectrometry and Direct
Current Plasma - Atomic Emission Spectrometry for the
determination of whole-water recoverable trace metals and
major ions in digested water samples
Edward J. Zayhowski, Supervisor, Plasma Unit,
Inorganic Chemistry Program, NWQL (303) 236-3180 (ZAYHOWSK)
Tedmund M. Struzeski, Chemist, Plasma Unit,
Inorganic Chemistry Program, NWQL (303) 236-3191 (STRUZESK)
99-03 October 14, 1998
Analysis of Total Phenols
Ronald W. Brenton, Organic Program (303) 236-2000 (rbrenton@usgs.gov)
99-02 October 6, 1998
Disposal of National Water-Quality Assessment (NAWQA)
Program Depositional Targeted Habitat (DTH) benthic
macroinvertebrate samples
Timothy L. Miller, Chief, NAWQA, (tlmiller@usgs.gov,
703-648-6868)
Robert S. Williams, Jr., Chief, NWQL, (bobwill@usgs.gov,
303-236-2000)
Stephen R. Moulton, II, Biological Unit Invertebrate
Specialist, NWQL (smoulto@usgs.gov, 303-236-2000)
99-01 October 8, 1998
Change in reporting unit for relative abundances of
helium isotopes
L. Niel Plummer, Eastern region Branch of Regional Research
(703) 648-5841, (nplummer)
Ann H. Mullin, Analytical Contracting Unit, NWQL,
(303) 236-2000 (ahmullin)
98-12 September 29, 1998
Graphite Furnace Atomic Absorption Spectrophotometry
(GFAAS) to replace Hydride Generation Atomic Absorption
Spectrophotometry (HGAAS) for the Determination of Antimony
in Filtered and Whole Water Recoverable Water Samples
Glenda E. Brown, Supervisory Chemist, Majors Unit, Inorganic
Chemistry Program (303) 236-2000 (GEBROWN@usgs.gov)
98-11 September 30, 1998
Graphite Furnace Atomic Absorption Spectrophotometry
(GFAAS) to replace Hydride Generation Atomic Absorption
Spectrophotometry (HGAAS) for the Determination of Arsenic
and Selenium in Filtered and Whole Water Recoverable Water,
and Recoverable Bottom Material Sediment
Glenda E. Brown, Supervisory Chemist, Majors Unit, Inorganic
Chemistry Program (303) 236-2000 (GEBROWN@usgs.gov)
98-10 August 12, 1998
National Water Quality Laboratory, Biological Unit availability
to process benthic Macroinvertebrate samples for the Water
Resources Division
Robert S. Williams, Jr., Chief, NWQL,
(bobwill@usgs.gov, 303-236-2000)
Timothy L. Miller, Chief, NAWQA,
(tlmiller@usgs.gov, 703-648-6868)
Stephen R. Moulton II, BU Invertebrate
Specialist, NWQL (smoulto@usgs.gov, 303-236-2000)
Gary Cottrell, BU Acting Supervisor, NWQL
(cottrell@usgs.gov, 303-236-2000)
98-09 April 30, 1998
Invertebrate Sample Field Processing and Shipment to the NWQL
Timothy L. Miller, Chief, NAWQA,
(tlmiller@usgs.gov, 703-648-6868)
Robert S. Williams, Jr., Chief, NWQL,
(bobwill@usgs.gov, 303-236-2000)
98-08 September 29, 1998
Change in the Analytical Method Used for the Determination
of Inorganic Carbon in Sediment
Ronald W. Brenton, Organic Chemistry Program, NWQL
(rbrenton@usgs.gov, 303-236-2000)
98-07 October 1, 1998
Reporting Level Changes for Volatile Organic Compounds
(Schedules 2020/2021), Inductively Coupled Plasma-Atomic
Emission Spectrometry (ICP-AES), Ammonia plus Organic
Nitrogen and Phosphorus (micro-Kjeldahl) in Water
Methods at the National Water Quality Laboratory
Bill Foreman, Research Chemist, Methods Research and
Development Program, NWQL (wforeman@usgs.gov, 303-236-2000)
Brooke Connor, VOC/Sediment Unit Supervisor, Organic
Chemistry Program, NWQL (bfconnor@usgs.gov, 303-236-2000)
Tom Maloney, Chief, Quality Management Program, NWQL
(tmaloney@usgs.gov, 303-236-2000)
This Memorandum also available in MS Word format.
98-06 April 28, 1998
Elimination of Acrolein from NWQL Schedules 2020, 2021 and
Deletion of Schedule 1401
Donna L. Rose, Chemist, Volatiles Unit
303-236-2000, dlrose@mailnwql.cr.usgs.gov
Brooke F. Connor, Supervisory Chemist, Volatiles Unit,
Organic Program, 303-236-2000, bfconnor@mailnwql.cr.usgs.gov
98-05 December 9, 1997
Changes in Minimum Reporting Levels for Inductively Coupled
Plasma - Atmonic Emission Spectrometry
Tom Maloney, Quality Management Program Chief, NWQL
(303) 236-2000, tmaloney@usgs.gov
98-04 December 9, 1997
Changes in Minimum Reporting Levels for Solids Analyses
at the NWQL (Lab Codes 159, 165, 27, 229, and 85) and
Request for Information on the Need to Develop Lower
Level Methods
Tom Maloney, Quality Management Program Chief, NWQL
(303) 236-2000, tmaloney@usgs.gov
98-03 August 28, 1998 - Revision A
Changes in Reporting Levels and Data Qualifiers for Selected
Pesticides and Degradation Products in Schedules 2050 and 2051
Bill Foreman, Methods Research & Development Program,
(303) 236-2000, wforeman@usgs.gov, and
Bob Gilliom, Chief, NAWQA Pesticide Synthesis Team,
(916) 278-3094, rgilliam@usgs.gov
98-03S August 28, 1998 - Supplementary Information - Revision A
Changes in Reporting Levels and Data Qualifiers
for Selected Pesticides and Degradation Products
in Schedules 2050 and 2051
Bill Foreman, Methods Research and Development Program,
(303) 236-2000, wforeman@usgs.gov, and
Bob Gilliom, Chief, NAWQA Pesticide Synthesis Team,
(916) 278-3094, rgilliom@usgs.gov
98-02 December 8, 1997
Reporting Changes for Selected Organochlorine Constituents from
Schedule 1325 (Insecticides and Gross PCBs in Bottom Material) and
Schedule 1335 (Organochlorine Insecticides, Gross PCBs, and
Organophosphate Insecticides in Bottom Material) - Minimum
Reporting Levels, Qualified Data, Surrogates, and Elimination
of Two Constituents
Brooke Connor, Sediments and Tissue Unit Supervisor,
(303) 236-2000, bfconnor@usgs.gov;
Dawn Hrinko, Analytical Chemist, Organics Program,
(303) 236-2000, hrinko@usgs.gov; and
Bill Foreman, Research Chemist, Methods Research and Development Program,
(303) 236-2000, wforeman@usgs
98-01 November 10, 1997
Change in Ammonia plus Organic Nitrogen Minimum Reporting Level
Charles J. Patton, Methods Research & Development Program,
(303) 236-2000, cjpatton@usgs.gov, and Juan Vasquez,
Supervisor, Nutrients Unit, (303) 236-2000, jvasquez@usgs.gov
97-12 August 8, 1997
Implementation of Method-O-7100-96 Determination of
Nonpurgeable Suspended Organic Carbon by Wet-chemical
Oxidation and Infrared Spectrometry
Ronald W. Brenton, Organic Program, (303)236-2000 (rbrenton@usgs.gov)
97-11 July 29, 1997
New Approved Method for VOCs
Brooke F. Connor, Supervisory Chemist, Volatiles Unit,
Organics Program (303) 236-2000, (bfconnor@usgs.gov)
97-10 June 20, 1997
Change in Ammonia Minimum Reporting Limit
Charles J. Patton, Methods Research & Development Program
(303) 236-2000, cjpatton@usgs.gov
97-09 June 11, 1997
Replacement or Elimination of NWQL Procedures
Peter F. Rogerson, Chief, NWQL (rogerson) (303)236-2000
Harold Ardourel, Ass't Chief, Inorganics (ardourel) (303)236-2000
Ralph White, Ass't Chief, Organics (wrwhite) (303)236-2000
97-08 April 1, 1997
Changes to the NWQL's Data Formatting and Transmittal Software
Richard A. Husband, Computer Services Unit, (303) 236-2000
(rhusband)
Linda K. Pratt, Chief, Laboratory Operations, (303) 236-2000
(lkpratt)
97-07 March 26, 1997
Replacement Chemical Oxygen Demand Instrumentation Operational
Glenda Brown, Inorganic Program (303) 236-2000
(gebrown@usgs.gov)
97-06 March 26, 1997
Retrieving Data from the National Water Quality Laboratory--
PR1ME Version
Steve Glodt, Computer Services Unit (srglodt) (303) 236-2000
97-05 February 28, 1997
Using the National Water Quality Laboratory for the analysis
of drinking water samples
Al Driscoll (DRISCOLL); Carmen Reed-Parker (CGREED); and
Kathy Bryant (KMBRYANT), Quality Assurance Unit, (303) 236-2000
97-04 April 7, 1997
Tritium/helium dating of ground-water samples available
through contract with Lamont-Doherty Earth Observatory
of Columbia University, Palisades, New York
L. Niel Plummer, Eastern Region Branch of Regional Research,
(703) 648-5841, (NPLUMMER)
Ann Mullin, Chief, Radiochemistry Unit, NWQL (303) 236-2000,
(AHMULLIN)
97-04S April 7, 1997 - Supplementary Information
Collection, processing, and analysis of ground-water samples
for tritium/helium-3 dating
L. Niel Plummer, BRR Reston, (NPLUMMER), 703-648-5841
Ann Mullin, NWQL, (AHMULLIN), 303-236-2000
97-03 February 28, 1997
Automated Data Transmission of All 25 Schedule 1379 Pesticides
Jim Madsen, Organic Program (303) 236-2000 (JEMADSEN)
97-02 November 25, 1996
Proposed Replacement or Elimination of NWQL Procedures
Peter F. Rogerson, Chief NWQL, (303)236-2000 (ROGERSON)
97-01 November 5, 1996
Use of Syringes to Add Volatile Organic Compounds to Water Samples
for Use as Matrix Spike Samples
Mark W. Sandstrom, Chief, Methods Research & Development
Program (SANDSTRO) (303) 236-2000, and Bruce R. Darnel,
Quality Management Program (BRDARNEL) (303) 236-2000
97-01S November 5, 1996 - Supplementary Information
Use of Syringes to Add Volatile Organic Compounds to Water Samples
for Use as Matrix Spike Samples
Mark W. Sandstrom, Chief, Methods Research & Development
Program (SANDSTRO) (303) 236-2000, and Bruce R. Darnel,
Quality Management Program (BRDARNEL) (303) 236-2000
96-12 September 25, 1996
Change in the calculation of values for inorganic carbon,
total in bottom material
Ronald W. Brenton, Organic Program, (303) 236-2000 (RBRENTON)
96-11 June 6, 1996
Changes in reporting of gross alpha and gross beta results
Ann Mullin, Chief, Radchem Unit (303) 236-2000 (AHMULLIN)
96-10 May 22, 1996
Inductively Coupled Plasma-Atomic Emission Spectrometry
(ICP-AES) to replace Direct Current Plasma-Atomic Emission
Spectrometry (DCP-AES) for the determination of dissolved
Aluminum and Boron in water
Tedmund M. Struzeski, Chemist, Plasma Unit, Inorganic
Chemistry Program (303) 236-2000 (STRUZESK)
96-09 May 22, 1996
Changes in reporting of gross alpha and gross beta results
Ann Mullin, Chief, Radchem Unit (303) 236-2000 (AHMULLIN)
96-08 May 22, 1996
Implementation of EPA Method 1664 for the Analysis of Oil and Grease
or Total Petroleum Hydrocarbons in water
Ronald W. Brenton, Organic Program (303) 236-2000 (RBRENTON)
96-07 May 22, 1996
Qualification of Data for Five Compounds on Laboratory
Schedules 2050 and 2051
Ronald W. Brenton, Organic Program (303) 236-2000 (RBRENTON)
96-06A April 15, 1996
Revised Method Detection Limits for Pesticide Schedules
2001/2010 and 2050/2051
Steven R. Glodt, Computer Specialist (303)236-2000
(SRGLODT)
96-05 April 5, 1996
Collection, processing, and analysis of carbon isotope
samples
Tyler B. Coplen, BRR Reston (TBCOPLEN), 703-648-5862
L. Niel Plummer, BRR Reston (NPLUMMER), 703-648-5841
Ann Mullin, NWQL (AHMULLIN), 303-236-2000
96-04 March 20, 1996
Inductively Coupled Plasma-Atomic Emission Spectrometry to
replace Flame Atomic Absorption Spectrometry for the determination
of dissolved trace metals and major ions in filtered acidified
water samples and the effects of this change
Jack DeGiacomo (DEGIACOM), Majors Unit, Inorganic Program,
(303) 236-2000.
96-03 March 20, 1996
Change of Reporting Levels for National Water Quality Laboratory
Analytical Schedule 1359--Carbamate Pesticides by Liquid/Liquid
Extraction and Liquid Chromatographic Analysis
Ronald W. Brenton, Organic Program (303)236-2000 (RBRENTON)
96-02 October 23, 1995
Lower Your Costs--Choose the right volatiles schedule.
Brooke F. Connor, Supervisory Chemist, Volatiles Unit,
Organics program (303)236-2000, (BFCONNOR)
96-01 October 23, 1995
Guidelines for Labeling 40-mL Volatiles Sample Vials
Brooke F. Connor, Supervisor, Volatiles Unit, Organic Program
(303)-236-2000 (BFCONNOR)
95-11 September 6, 1995
Submission of samples for analysis by the
NRP Isotope Tracers Project in Menlo Park
Thomas J. Maloney, Chief, Quality Mgmt. Program, (303) 236-2000
(TMALONEY)
Carol Kendall, Chief, NRP Isotope Tracers Project, (415) 329-4538
(CKENDALL)
95-10 September 13, 1995
Overview of the QA/QC plan for the Radchem/Stable Isotope contracts
at the NWQL
Ann H. Mullin, Supervisory Radchem Unit Chemist, (303) 236-2000
(AHMULLIN)
95-09 August 25, 1995
Discontinuation Of Automatic Swapping
Linda K. Pratt, Chief, Laboratory Operations
(303) 236-2000 (LKPRATT)
95-08 August 9, 1995
Return and reimbursement for 250-ml FAB teflon bottles in the field.
Harold Ardourel, Acting Assistant Chief, Inorganic Program,
(303) 236-2000 (ARDOUREL)
95-07 May 25, 1995
Submission of samples for analysis by the NRP
Isotope Fractionation Project in Reston
Thomas J. Maloney, Chief, Quality Mgmt. Program, (303) 236-2000
(TMALONEY)
Tyler Coplen, Chief, NRP Isotope Fractionation Project, (703) 648-5862
(TCOPLEN)
95-06 May 3, 1995
Use of one filtered, acidified (FA) bottle for trace metal and other
cations for the inorganic protocol
Harold Ardourel, Assistant Chief, Inorganic Program (303) 236-2000
(ARDOUREL)
95-05 March 8, 1995
Nitrogen Isotope Sample Preservation for Water Samples
Jeanne Hatcher, Radchem Unit, Quality Management Program
(JHATCHER (303) 236-2000)
95-04 December 2, 1994 SUPERSEDED by NWQL 2002-04 (09/23/02)
Shipping Samples to the National Water Quality Laboratory
Linda K. Pratt, Chief, Lab Operations (303) 236-2000 (LKPRATT)
95-03 October 14, 1994
Graphite Furnace Atomic Absorption Spectrophotometry to replace
Atomic Absorption Spectrometric, Chelation-extraction for the
determination of molybdenum in water
Betty McLain, LIS Unit, Inorganics Program (303) 236-2000
(BJMCLAIN)
95-02 October 14, 1994
Separate Analytical Services Request Form Suggested for Trace
Element ppb Protocol
Peter Rogerson, (303) 236-2000, (ROGERSON)
95-01 October 14, 1994
National Water Quality Laboratory Alkalinity Reanalysis Policy
James L. Pilon & Kailin Terry, Quality Mgmt. Program
(303) 236-2000 (JLPILON), (303) 236-2000 (KKTERRY)
94-13 August 25, 1994
National Water Quality Laboratory Reporting Level for the Oil and
Grease in Bottom Material Analysis
Ronald W. Brenton, Organic Program (303)236-2000 (RBRENTON)
94-12 July 8, 1994
Description and guide for interpreting low-level data supplied by the NWQL
for schedules 2001, 2010, 2050, and 2051
Jeffrey W. Pritt, Quality Mgmt. Program
JWPRITT (303) 236-2000
94-11 May 4, 1994
New prices and lab codes for sulfur isotope (delta-34 S) analysis
Ann H. Mullin, Radchem Unit, Quality Mgmt. Program
AHMULLIN (303) 236-2000
94-10 April 12, 1994
Change in decay calculations at the University of Miami Tritium
Laboratory
Change in oxygen isotopic data at the Reston Stable Isotope
Laboratory
Ann Mullin, Radchem Unit (AHMULLIN) (303) 236-2000
94-09 March 4, 1994
Calculation error on mercury bottom material data
Glenda E. Brown (GEBROWN) (303) 236-2000
94-08 March 4, 1994
Availability of ICP-MS and a comparison of its analytical
capabilities with more established techniques
John R. Garbarino (303) 236-2000 (JRGARB)
94-07 February 10, 1994
Description and use by districts of Laboratory QC sample information
in organic determinations
Mark Sandstrom (303) 236-2000 (SANDSTRO)
94-06 January 24, 1994
Limitation in the determination of selected carbamate pesticides in
water
Bill Foreman (WFOREMAN), Methods Research & Development
Marvin Fishman (FISHMAN)
94-05 January 5, 1994
Availability of a new Analysis for the Quantitation of Glyphosate
Herbicide
Mike Schroeder (303) 236-2000 (SCHROEDE)
94-04 December 30, 1993
Graphite Furnace Atomic Absorption Spectrophotometry to
replace Direct-Current Plasma Atomic Emission Spectrometry for the
determination of chromium in water
Betty J. McLain (303) 236-2000 (BJMCLAIN)
94-03 December 22, 1993
Change in Method for Determining Chloride, Sulfate, and Fluoride
Peter F. Rogerson
94-02 December 10, 1993
NWQL Policy on pH Analytical Determinations
Harold Ardourel (303) 236-2000
Thomas J. Maloney
94-01 October 18, 1993
Discontinuance of analysis of unfiltered (raw) water samples for
radionuclides by the National Water Quality Laboratory (NWQL)
Discontinuance of analysis of unfiltered, acidified samples for total
uranium
Ann Mullin, Radiochemistry Unit (303) 236-2000 (AHMULLIN)
93-10 August 25, 1993
Interferences in the Methylene Blue Active Substances [MBAS] Method,
Techniques of Water-Resources Investigation [TWRI], [0-311-83],
Book 5, Chapter A3.
Mark Burkhardt, Methods Research & Development Program (303) 236-2000
(MRBURK), and Jeff Pritt, Quality Management Group (303) 236-2000
(JWPRITT)
93-09 August 24, 1993
Radon.- Discontinuance of duplicate samples for radon-in-water.
Change in window setting for analysis.
Ann H. Mullin, Radchem Section Chief (303) 236-2000 (AHMULLIN)
93-08 May 26, 1993
New Inorganic Tissue Method
Merle W. Shockey, Inorganic Program Chief (303) 236-2000
93-07 March 15, 1993
Problems with Laboratory pH analytical determinations
Harold Ardourel (303) 236-2000
93-06 March 11, 1993
Raising the method detection limit for gross alpha and
gross beta
Ann Mullin (303) 236-2000
93-05 March 10, 1993
Establishment of one analytical range for silica method
Harold Ardourel (303) 236-2000
93-03 December 28, 1992
Change in method for the determination of chloride in water due to
data quality problems.
Charlie Patton, Gary Cottrell, and Jeff Pritt.
93-02 October 5, 1992
Review process for samples analyzed at the National Water
Quality Laboratory (NWQL)
Dariel Blackburn, Quality Management Group, (303) 236-2000
93-01 October 5, 1992
Identification of Low Levels of Sodium Contamination in Nitric
Acid Samples
Jeff Pritt, Quality Management Group, NWQL
92-07 August 12, 1992
Change of Sample Type Requirement for Ion Chromatography
Analysis
Harold Ardourel, Inorganic Program (303) 236-2000
92-06 August 12, 1992
District Rerun Requests
Quality Management Group
92-05 August 12, 1992
New Nitrogen-15/Nitrogen-14 Lab Codes
Ann Mullin
92-04 August 12, 1992
Bottles for Tritium Analyses
Ann Mullin
92-03 August 12, 1992
Mercuric Chloride Preservation of S-34/S-32, O-18/O-16,
and H-2/1-1-1 Samples
Ann Mullin
92-02 May 29, 1992
Reimbursement for Deleted Lab Requests
92-01 March 25, 1992
Technology Transfer.- AVAILABILITY OF EQUIPMENT BLANK WATER
FOR INORGANIC & ORGANIC ANALYSIS
NWQL Home Page