John Wiley & Sons, Ltd.

Application of a Tenax model to assess bioavailability of PCBs in field sediments

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Recent literature has shown that bioavailability‐based techniques, such as Tenax extraction, can estimate sediment exposure to benthos. In our previous study, Tenax extraction was used to create and validate a literature‐based Tenax model (TM) to predict oligochaete bioaccumulation of polychlorinated biphenyls (PCBs) from sediment; however, its ability to assess sediment remediation was unknown. The present study further tested the TM by examining the impacts of remediation on surface sediment concentrations, Tenax extractable concentrations, and tissue concentrations of laboratory‐exposed Lumbriculus variegatus. Tenax extractable concentrations were an effective exposure metric to evaluate changes in Lumbriculus exposure pre‐ and post‐remediation with 75% of the post‐remediation data corresponding to the TM. At non‐dredged sites, bioaccumulation was better predicted by the TM with 86% of the data falling within the 95% confidence intervals, than at dredged sites which had only 64% of the data fitting the TM. In both pre‐ and post‐dredge conditions, when the model failed, it was conservative predicting higher PCB concentrations than observed in the oligochaetes particularly for the post‐dredge data. This present study advances our understanding of the applicability of the TM for use when examining systems that may have undergone significant disturbances. The TM provides a unique tool for quickly quantifying potential exposure to benthic organisms. Environ Toxicol Chem © 2013 SETAC

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