Evaluation of a first-order model for the prediction of the bioaccumulation of PCBS and DDT from sediment into the marine deposit-feeding clam Macoma nasuta
✍ Scribed by Bruce L. Boese; Henry Lee II; Scott Echols
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 101 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0730-7268
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✦ Synopsis
A first-order model for predicting contaminant bioaccumulation from sediments into benthic invertebrates was validated using a marine deposit-feeding clam, Macoma nasuta, 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, K ow , Ͻ7) 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 steadystate tissue residues within two-fold and was a better predictor than the model for the BAFs of superlipophilic PCBs (log K ow Ͼ7). Differences in contaminant bioavailability were noted between field-contaminated (DDT) and laboratory-spiked (PCB) sediments.