Authors
Gordon R Toevs, Matthew J Morra, Matthew L Polizzotto, Daniel G Strawn, Benjamin C Bostick, Scott Fendorf
Publication date
2006/4/15
Journal
Environmental science & technology
Volume
40
Issue
8
Pages
2537-2543
Publisher
American Chemical Society
Description
Mining activity along the South Fork of the Coeur d' Alene River in northern Idaho has resulted in fluvial mine tailings enriched in Pb, As, Ag, Sb, Hg, Cd, and Zn deposited on the lakebed of Lake Coeur d'Alene, thus serving as a potential benthic source of inorganic contaminants. Our objective was to characterize the dominant solid phase materials and diagenetic processes controlling metal(loid) solubilities, and thus their potential release to the overlying water column. Aqueous and solid concentrations of metal(loid) contaminants were examined along with distinct species of Fe and S within sediments and interstitial water. A gradient from oxic conditions at the sediment−water interface to anoxic conditions below 15 cm exists at all sites, resulting in a dynamic redox environment that controls the partitioning of contaminants. Fluvial deposition from frequent seasonal flood events bury ferric oxides residing at the …
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GR Toevs, MJ Morra, ML Polizzotto, DG Strawn… - Environmental science & technology, 2006