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Total selenium and selenium species in irrigation drain inflows to the Salton Sea, California, October 2007 and January 2008

June 10, 2008

This report presents the results for two sampling periods (October 2007 and January 2008) during a 4-year monitoring program to characterize selenium concentrations in selected irrigation drains flowing into the Salton Sea, California. Total selenium, selenium species (selenite, selenate, organoselenium), and total suspended solids were determined in water samples, and total selenium was determined in sediment, detritus, and biota that included algae, plankton, midge larvae (family, Chironomidae), and two fish species?western mosquitofish (Gambusia affinis) and sailfin molly (Poecilia latipinna). In addition, sediments were analyzed for percent total organic carbon and particle size. Mean total selenium concentrations in water for both sampling periods ranged from 0.97 to 64.5 micrograms per liter, predominately as selenate, which is typical of waters where selenium is leached out of selenium-containing marine shales and associated soils under alkaline and oxidizing conditions. Total selenium concentrations (micrograms per gram dry weight) ranged as follows: algae, 0.95 to 5.99; plankton, 0.15 to 19.3; midges, 1.39 to 15.4; fish, 3.71 to 25.1; detritus, 0.85 to 21.7; sediment, 0.32 to 7.28.

Citation Information

Publication Year 2008
Title Total selenium and selenium species in irrigation drain inflows to the Salton Sea, California, October 2007 and January 2008
DOI 10.3133/ofr20081178
Authors Thomas W. May, Michael J. Walther, Michael K. Saiki, William G. Brumbaugh
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 2008-1178
Index ID ofr20081178
Record Source USGS Publications Warehouse
USGS Organization Columbia Environmental Research Center

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