Method of analysis and quality-assurance practices for determination of pesticides in water by solid-phase extraction and capillary-column gas chromatography/mass spectrometry at the U.S. Geological Survey California District Organic Chemistry Laboratory, 1996-99

Crepeau, Kathryn L.; Baker, Lucian M.; Kuivila, Kathryn M.

Abstract:

A method of analysis and quality-assurance practices were developed to study the fate and transport of pesticides in the San Francisco Bay-Estuary by the U.S. Geological Survey. Water samples were filtered to remove suspended-particulate matter and pumped through C-8 solid-phase extraction cartridges to extract the pesticides. The cartridges were dried with carbon dioxide and the pesticides were eluted with three cartridge volumes of hexane:diethyl ether (1:1) solution. The eluants were analyzed using capillary-column gas chromatography/mass spectrometry in full-scan mode. Method detection limits for pesticides ranged from 0.002 to 0.025 microgram per liter for 1-liter samples. Recoveries ranged from 44 to 140 percent for 25 pesticides in samples of organic-free reagent water and Sacramento-San Joaquin Delta and Suisun Bay water fortified at 0.05 and 0.50 microgram per liter. The estimated holding time for pesticides after extraction on C-8 solid-phase extraction cartridges ranged from 10 to 257 days.

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USGS Numbered Series

ProdID:

22790

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Crepeau, Kathryn L.; Baker, Lucian M.; Kuivila, Kathryn M.

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ENGLISH

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iv, 19 p. :map ;28 cm.

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U.S. Department of the Interior, U.S. Geological Survey ; Information Services [distributor],

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Open-File Report

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OFR

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2000-229

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Method of analysis and quality-assurance practices for determination of pesticides in water by solid-phase extraction and capillary-column gas chromatography/mass spectrometry at the U.S. Geological Survey California District Organic Chemistry Laboratory, 1996-99; 2000; OFR; 2000-229; Crepeau, Kathryn L.; Baker, Lucian M.; Kuivila, Kathryn M.