Comparing Polychlorinated Biphenyl Concentrations and Patterns in the Saginaw River Using Sediment, Caged Fish, and Semipermeable Membrane Devices

摘要: Three techniques of assessing bioavailable polychlorinated biphenyls (PCBs) in the Saginaw River, MI, were compared: sediments, caged fish, and semipermeable membrane devices (SPMDs). SPMDs fish placed river for 28 days at five sites where sediments also sampled. The samples analyzed PCB congeners to determine concentrations patterns. Total ranged from 33 280 ng/g (dry weight) 46 290 (wet 77 790 SPMDs. Previously reported rates accumulation by used estimate aqueous detected Sediment-water partition coefficients sediment. Steady-state bioconcentration factors depuration rate constants dissolved channel catfish. Relative patterns SPMDs, sediment compared using principal components analysis. SPMD provide complementary information. Sediments reflect long-term weathering, while integrate water only during sampling period. Because higher solubilities lower-chlorinated PCBs these predominate as sediments. Contaminant profile differences between are likely due metabolism certain fish.