| 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 ... | 2002 | 11994779 |