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bioaccumulation of pcbs in aquatic biota from a tidal freshwater marsh ecosystem.water, sediments, and aquatic biota were sampled in a tidal river-marsh on the potomac river near washington, dc (usa) to assess baseline concentrations of polychlorinated biphenyls (pcbs) and bioaccumulation in finish species. the mean sediment total-pcb concentration in the wetland was 50 ng/g dry weight, and mean concentrations in biota ranged from 150 ng/g to 450 ng/g wet weight. the highest pcb concentrations were observed in channel catfish. the median biota-sediment accumulation factor (b ...200211994779
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