Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9456306 | Environmental Pollution | 2005 | 9 Pages |
Abstract
The fate of perchlorate (ClO4â) in streambed sediments is becoming a concern due to the increasing number of groundwater and surface water contamination sites in the United States. Dialysis samplers were deployed at three sites over a period of 1 year to determine the vertical distribution of ClO4â in sediment pore water. Results indicated that the spatial and temporal ClO4â penetration into sediments could be affected by numerous factors, such as temperature, microbial degradation, ClO4â surface water concentration, and sediment physico-geological properties. In general, maximum ClO4â penetration into sediments at the studied sites was 30 cm below the sediment-water surface. The vertical sequential depletion of electron acceptors in sediments suggested that microbial reduction was responsible for ClO4â depletion in stream sediments. Biodegradation of ClO4â occurred over a seasonally variable active depth zone of 1-10 cm. Results implied that there was a rapid natural attenuation potential of perchlorate in saturated near-surface sediments.
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Authors
Kui Tan, Todd A. Anderson, W. Andrew Jackson,