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Assessing selenium contamination in the irrigated stream-aquifer system of the Arkansas River, Colorado.

Abstract：

:Prudent interventions for reducing selenium (Se) in groundwater and streams within an irrigated river valley must be guided by a sound understanding of current field conditions. An emerging picture of the nature of Se contamination within the Lower Arkansas River Valley in Colorado is provided by data from a large number of groundwater and surface water sampling locations within two study regions along the river. Measurements show that dissolved Se concentrations in the river are about double the current Colorado Department of Public Health and Environment (CDPHE) chronic standard of 4.6 microg L(-1) for aquatic habitat in the upstream region and exceed the standard by a factor of 2 to 4 in the downstream region. Groundwater concentrations average about 57.7 microg L(-1) upstream and 33.0 microg L(-1) downstream, indicating a large subsurface source for irrigation-induced dissolution and mobilization of Se loads to the river and its tributaries. Inverse correlation was found between Se concentration and the distance to the closest identified shale in the direction upstream along the principal groundwater flow gradient. The data also exhibited, among other relationships, a moderate to strong correlation between dissolved Se and total dissolved solids in groundwater and surface water, a strong correlation with uranium in groundwater, and power relationships with nitrate in groundwater. The relationship to nitrate, derived primarily from N fertilizers, reveals the degree to which dissolved Se depends on oxidation and inhibited reduction due to denitrification and suggests that there are prospects for reducing dissolved Se through nitrate control. Current and future results from these ongoing studies will help provide a foundation for modeling and for the discovery of best management practices (BMPs) in irrigated agriculture that can diminish Se contamination.

journal_name

J Environ Qual

journal_title

Journal of environmental quality

authors

Gates TK,Cody BM,Donnelly JP,Herting AW,Bailey RT,Mueller Price J

doi

10.2134/jeq2008.0499

subject

Has Abstract

pub_date

2009-10-29 00:00:00

pages

2344-56

issue

eissn

0047-2425

issn

1537-2537

pii

38/6/2344

journal_volume

pub_type

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Assessing selenium contamination in the irrigated stream-aquifer system of the Arkansas River, Colorado.