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Sediment from three reservoirs located in the Little Washita River Experimental Watershed (LWREW) in Oklahoma, USA with contrasting dominant land uses were analyzed for total and extractable concentrations of arsenic (As) and chromium (Cr), and the potential ecologic risk to benthic organisms. Extractable As ranged from 0.24 to 1.21 mg kg-1, in the order grazingcroplandforest and 0.13-0.58 mg kg-1 for extractable Cr, in the order of forestgrazingcropland. However, only approximately phenolic C. The sediment concentration analysis results ill
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