Search Results for the EPA National Library Catalog

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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 1993
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : a method supplement for the determination of Fipronil and degradates in water by gas chromatography/mass spectrometry / 2003
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : arsenic speciation in natural-water samples using laboratory and field methods / 2002
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : comparison of a nitric acid in-bottle digestion procedure to other whole-water digestion procedures / 1999
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of ammonium plus organic nitrogen by a Kjeldahl digestion method and an automated photometric finish that includes digest cleanup by gas diffusion / 2000
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of arsenic and selenium in water and sediment by graphite furnace atomic absorption spectrometry / 1999
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of dissolved arsenic, boron, lithium, selenium, strontium, thallium, and vanadium using inductively coupled plasma-mass spectrometry / 1999
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of elements in whole-water digests using inductively coupled plasma-optical emission spectrometry and inductively coupled plasma-mass spectrometry / 1998
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of inorganic and organic constituents in water and fluvial sediments / 1993
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of moderate-use pesticides and selected degradates in water by C-18 solid-phase extraction and gas chromatography/mass spectrometry / 2001
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of molybdenum in water by graphite furnace atomic absorption spectrophotometry / 1997
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of organic plus inorganic mercury in filtered and unfiltered natural water with cold vapor, atomic fluorescence spectrometry / 2001
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of organophosphate pesticides in filtered water by gas chromatography with flame photometric detection / 2002
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of pesticides in water by C-18 solid-phase extraction and capillary-column gas chromatography/mass spectrometry with selected-ion monitoring / 1995
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of pesticides in water by Carbopak-B solid-phase extraction and high-performance liquid chromatography / 1996
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of wastewater compounds by polystyrene-divinylbenzene solid-phase extraction and capillary-column gas chromatography/mass spectrometry / 2002
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of whole-water recoverable arsenic, boron, and vanadium using inductively coupled plasma-mass spectrometry / 2000
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : processing, taxonomy, and quality control of benthic macroinvertebrate samples / 2000
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory determination of antimony by automated-hydride atomic absorption spectrophotometry / 1994
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory determination of chlorinated pesticides in aquatic tissue by capillary-column gas chromatography with electron-capture detection / 1995
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory determination of chromium in water by graphite furnace atomic absorption spectrophotometry / 1993
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory determination of low-level silver by graphite furnace atomic absorption spectrophotometry / 1993
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory determination of metals in water by inductively coupled plasma-mass spectrometry / 1993
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory determination of organochlorine pesticides and polychlorinated biphenyls in bottom sediment by dual capillary-column gas chromatography with electron-capture detection / 1995
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 / 1992
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory determination of semivolatile organic compounds in bottom sediment by solvent extraction, gel permeation chromatographic fractionation, and capillary-column gas chromatography/mass spectrometry / 1996
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory determination of triazine and other nitrogen-containing compounds by gas chromatography with nitrogen phosphorus detectors / 1994
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory in-bottle acid digestion of whole-water samples / 1996
Quality assurance/quality control manual National Water Quality Laboratory / 1995
Using analytical services at the National Water Quality Laboratory 1994

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