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Boese, Bruce L., Henry Lee II, and S. Echols. 1997. Evaluation of a first-order model for the prediction of the bioaccumulation of PVBs and DDTs from sediment into the marine deposit-feeding clam, macoma nasuta. Environmental Toxicology and Chemistry 16:1545-1552. NHEERL-COR-1985J.

A first-order model for predicting contaminant bioaccumulation from sediments into benthic invertebrates was validated using a marine deposit-feeding clam, Macoma nastua, exposed to polychlorobiphenyl (PCB)-spiked and dichlorodiphenyltrichloroethane (DDT)-contaminated sediments. Contaminant uptake and depuration were analyzed following short-term and long-term sediment exposures. Uptake and depuration rates were used to predict steady-state bioaccumulation factors (BAFs) and exposure times needed to attain steady state. These predictions were compared to observed steady-state BAFs. Estimating elimination and uptake rates from depuration and short-term uptake experiments was an accurate means of predicting BAFs for some PCBs (log octanol water partition coefficient Kow,<7) but was not as accurate for predicting DDT BAFs. The exposure time need to attain steady state was poorly predicted by the model. The results demonstrated that a standard 28-d bioaccumulation test estimated steady-state tissue residues within two-fold and was a better predictor than the model for the BAFs of superlipophilic PCBs (log Kow>7). Differences in contaminant bioavailability were noted between field-contaminated (DDT) and laboratory-spikes (PCB) sediments.

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