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Dissolved pesticides in the Alamo River and the Salton Sea, California, 1996-97

October 1, 2002

Water samples were collected from the Alamo River and the Salton Sea, California, in autumn 1996 and late winter/early spring 1997 and analyzed for dissolved pesticides. The two seasons chosen for sampling were during pesticide application periods in the Imperial Valley. Pesticide concentrations were measured in filtered water samples using solid-phase extraction and analyzed by gas chromatography/mass spectrometry. Generally, the highest concentrations were measured in the Alamo River. The concentrations of carbaryl, chlorpyrifos, cycloate, dacthal, diazinon, and eptam were highest in samples collected in autumn 1996. In contrast, the concentrations of atrazine, carbofuran, and malathion were highest in samples collected in late winter/early spring 1997. The highest concentrations measured of atrazine, carbofuran, dacthal, eptam, and malathion all exceeded 1,000 nanograms per liter.

Citation Information

Publication Year 2002
Title Dissolved pesticides in the Alamo River and the Salton Sea, California, 1996-97
DOI 10.3133/ofr02232
Authors Kathryn L. Crepeau, Kathryn Kuivila, Brian A. Bergamaschi
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 2002-232
Index ID ofr02232
Record Source USGS Publications Warehouse
USGS Organization