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A region-wide data analysis on polychlorinated biphenyls (PCBs) in the sediment of the Great Lakes reveals a total accumulation of approximately 300±50tonnes, representing a >30% reduction from the 1980s. Evidence of in situ degradation of sediment PCB was found, with estimated t 1/2 of 11 and 17 years, at two open water locations in Lake Ontario. The relative abundance of heavy homologs...
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