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Related Experiment Videos

Predicting bioavailability and bioaccumulation with in vitro digestive fluid extraction.

Donald P Weston1, Keith A Maruya

  • 1University of California, Berkeley, Department of Integrative Biology, 94720-3140, USA. dweston@uclink4.berkeley.edu

Environmental Toxicology and Chemistry
|May 16, 2002
PubMed
Summary

This study compared a novel in vitro digestive fluid extraction with a bivalve bioaccumulation assay to assess contaminant bioavailability. The in vitro method shows promise as a rapid screening tool for predicting bioaccumulation risks.

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Area of Science:

  • Environmental Chemistry
  • Ecotoxicology
  • Marine Biology

Background:

  • Assessing the bioavailability of sediment-associated contaminants is crucial for environmental risk assessment.
  • Traditional bioaccumulation tests with organisms like bivalves are time-consuming and resource-intensive.

Purpose of the Study:

  • To compare a novel in vitro digestive fluid extraction procedure with a standard bivalve bioaccumulation assay.
  • To evaluate the effectiveness of these methods in identifying key sediment-associated contaminants and predicting their bioavailability.

Main Methods:

  • Sediments from a U.S. Navy facility were extracted using digestive fluid from the polychaete Arenicola brasiliensis.
  • Parallel tests involved a bivalve (Macoma nasuta) bioaccumulation assay over 28 days.

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  • Contaminant concentrations in digestive fluid and bivalve tissues were analyzed.

    • Main Results:

    • Both methods identified Cadmium (Cd), Lead (Pb), high molecular weight polycyclic aromatic hydrocarbons (HPAHs), and polychlorinated biphenyls (PCBs) as primary contaminants of concern.
    • The in vitro digestive fluid extraction showed high correlation with bivalve bioaccumulation for Cd and Pb.
    • Bulk sediment concentrations were also effective predictors of bioaccumulation.

    Conclusions:

    • The in vitro digestive fluid extraction assay is a potential screening tool for predicting relative bioaccumulation risk.
    • This novel method offers advantages over traditional bioaccumulation tests in terms of speed and efficiency.
    • Understanding contaminant bioavailability is key to accurate environmental risk assessment.