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Distribution and mobilization of dissolved selenium in ground water of the irrigated grand and Uncompahgre Valleys, Western Colorado

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Abstract

Distribution of dissolved selenium in ground water of the irrigated Grand and Uncompahgre Valleys is affected by the aqueous geochemical environment of the shallow ground-water system composed of alluvium and shale residuum. Selenium concentrations are as high as 1,300 micrograms per liter in water from shallow wells. The highest concentrations of dissolved selenium were in water from wells completed in alluvium overlying the Mancos Shale of Cretaceous Age, and the lowest concentrations were in water from wells completed in terrace deposits on the western side of the Uncompahgre Valley and in water from wells completed in Mancos Shale residuum. Factors controlling the mobilization of dissolved selenium in the Grand and Uncompahgre Valleys could include oxidation/reduction, adsorption/desorption, and(or) ion exchange. Infiltration of irrigation water provides oxidizing conditions for mobilization of selenium from alluvium and shale residuum and transport to streams and irrigation drains tributary to the Uncompahgre, Gunnison and Colorado Rivers.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Distribution and mobilization of dissolved selenium in ground water of the irrigated grand and Uncompahgre Valleys, Western Colorado
ISBN:
0872629198
Year Published:
1993
Language:
English
Publisher:
Publ by ASCE
Publisher location:
New York, NY, United States
Larger Work Title:
Management of Irrigation and Drainage Systems : Integrated Perspectives
First page:
770
Last page:
777
Number of Pages:
8
Conference Title:
Management of Irrigation and Drainage Systems : Integrated Perspectives
Conference Location:
Park City, UT, USA
Conference Date:
21 July 1993 through 23 July 1993