Publications
Filter Total Items: 198
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of low-level silver by graphite furnace atomic absorption spectrophotometry
Increased awareness of the quality of water in the United States has led to the development of a method for determining low levels (0.2-5.0 microg/L) of silver in water samples. Use of graphite furnace atomic absorption spectrophotometry provides a sensitive, precise, and accurate method for determining low-level silver in samples of low ionic-strength water, precipitation water, and natural water
Authors
D.L. Damrau
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of dissolved organic carbon by UV-promoted persulfate oxidation and infrared spectrometry
No abstract available.
Authors
R.W. Brenton, T.L. Arnett
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of inorganic and organic constituents in water and fluvial sediments
Methods to be used to analyze samples of water, suspended sediment and bottom material for their content of inorganic and organic constituents are presented. Technology continually changes, and so this laboratory manual includes new and revised methods for determining the concentration of dissolved constituents in water, whole water recoverable constituents in water-suspended sediment samples, and
Quality assurance/quality control manual; National Water Quality Laboratory
No abstract available.
Authors
J.W. Raese
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of the total phosphorus by a Kjeldahl digestion method and an automated colorimetric finish that includes dialysis
A method to determine total phosphorus (TP) in the same digests prepared for total Kjeldahl nitrogen (TKN) determinations is desribed. The batch, high-temperature (block digester), HG(II)-catalyzed digestion step is similar to U.S. Geological Survey methods I-2552-85/I-4552-85 and U.S. Environmental Protection Agency method 365.4 except that sample and reagent volumes are halved. Prepared digest
Authors
Charles J. Patton, Earl P. Truitt
Methods of analysis by the U. S. Geological Survey National Water Quality Laboratory-Determination of organonitrogen herbicides in water by solid-phase extraction and capillary-column gas chromatography/mass spectrometry with selected-ion monitoring
A method for the isolation of organonitrogen herbicides from natural
water samples using solid-phase extraction and analysis by capillary-column
gas chromatography/mass spectrometry with selected-ion monitoring is
described. Water samples are filtered to remove suspended particulate matter
and then are pumped through disposable solid-phase extraction cartridges
containing octadecyl-bonded por
Authors
Mark W. Sandstrom, Duane S. Wydoski, Michael P. Schroeder, Jana L. Zamboni, William T. Foreman
A protocol for onsite screening of volatile organic compounds using a portable gas chromatograph
No abstract available.
Authors
R.D. Brock
Determination of trace concentrations of volatile organic compounds in ground water using closed-loop stripping, Edwards aquifer, Texas
No abstract available.
Authors
P.M. Buszka, S.D. Zaugg, M.G. Werner
Methods for determination of inorganic substances in water and fluvial sediments
Chapter Al of the laboratory manual contains methods used by the U.S. Geological Survey to analyze samples of water, suspended sediments, and bottom material for their content of inorganic constituents. Included are methods for determining the concentration of dissolved constituents in water, the total recoverable and total of constituents in water-suspended sediment samples, and the recoverable a
Authors
Marvin J. Fishman, Linda C. Friedman
Methods for the determination of organic substances in water and fluvial sediments
This manual describes analytical methods used by the U.S. Geological Survey to determine organic substances in water, water-suspended-sediment mixtures, and bottom material. Some of the analytical procedures yield determinations for specific com-pounds, whereas others provide a measure of the quantity of groups of compounds present in the sample. Examples of the first category are procedures for t
Methods for the determination of organic substances in water and fluvial sediments, USGS TWRI, Book 5, Laboratory analysis, Chapter A3
This manual contains analytical methods used by the U.S. Geological Survey for the determination of organic substances in water, water-suspended sediment mixtures, and bottom material. Some of the analytical procedures yield determinations for specific compounds, whereas others provide a measure of the quantity of groups of compounds present in the sample. Examples of the first category are proced