Skip to main content
U.S. flag

An official website of the United States government

Selenium, selected inorganic elements, and organochlorine pesticides in bottom material and biota from the Colorado River delta

January 1, 2001

Concentrations of selenium (Se) in bottom material ranged from 0.6 to 5.0 μg g−1, and from 0.5 to 18.3 μg g−1in biota; 23% of samples exceeded the toxic threshold. Concentrations of DDE in biota exceeded the toxic threshold in 30% of the samples. Greater concentrations of selenium in biota were found at sites with strongly reducing conditions, no output, alternating periods of drying and flooding or dredging activities, and at sites that received water directly from the Colorado River. The smallest Se concentrations in biota were found at sites where an outflow and exposure or physical disturbance of the bottom material were uncommon.

Citation Information

Publication Year 2001
Title Selenium, selected inorganic elements, and organochlorine pesticides in bottom material and biota from the Colorado River delta
DOI 10.1006/jare.2001.0836
Authors J. Garcia-Hernandez, K. A. King, A.L. Velasco, E. Shumilin, M.A. Mora, E.P. Glenn
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Arid Environments
Series Number
Index ID 70023043
Record Source USGS Publications Warehouse
USGS Organization Columbia Environmental Research Center