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Total Selenium and Selenium Species in Irrigation Drain Inflows to the Salton Sea, California, April and July 2008

Open-File Report 2009-1011

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Abstract

This report presents the results for two sampling periods (April 2008 and July 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 (dissolved selenite, selenate, organoselenium), and total suspended solids were determined in water samples and total selenium was determined in water column particulates and 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 1.93 to 44.2 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, 0.75 to 3.39; plankton, 0.88 to 4.03; midges, 2.52 to 44.3; fish, 3.37 to 18.9; detritus, 1.11 to 13.6; sediment, 0.11 to 8.93.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Total Selenium and Selenium Species in Irrigation Drain Inflows to the Salton Sea, California, April and July 2008
Series title:
Open-File Report
Series number:
2009-1011
Edition:
-
Year Published:
2009
Language:
ENGLISH
Publisher:
U.S. Geological Survey
Contributing office(s):
Columbia Environmental Research Center
Description:
iv, 18 p.
Time Range Start:
2008-04-01
Time Range End:
2008-07-31
Online Only (Y/N):
Y