title: Bioavailability of lab-contaminated and native polycyclic aromatic hydrocarbons to the amphipod Corophium volutator relates to chemical desorption.
abstract: In the present study, the relationship between bioavailability of polycyclic aromatic hydrocarbons (PAHs) to benthic amphipods and the PAH desorption kinetics was examined. To that end, field-contaminated sediment was treated in three different ways. One subsample had no addition of PAHs and contained native PAHs only. To a second subsample, six PAHs (phenanthrene, fluoranthene, anthracene, pyrene, benzo[b]fluoranthene, and benzo[k]fluoranthene) were added in the laboratory. Two of the PAHs were added at higher concentrations to a third subsample, serving as a control for concentration-dependent uptake. Marine amphipods (Corophium volutator) were exposed to the three subsamples for a maximum of 25 d and were subsequently analyzed. Desorption kinetics were determined for both the lab-contaminated and the native PAHs. The biota-to-sediment accumulation factor (BSAF) values of the individual native and lab-contaminated PAHs correlated well with the rapidly desorbing fraction (R2 = 0.76). The BSAFs were 1.4 to 3.3 higher for the lab-contaminated PAHs compared with the native PAHs, while the difference between the rapidly desorbing fractions was a factor of 1.1 to 1.8. The BSAFs of the lab-contaminated PAHs in the second and third subsample were equal, indicating concentration-independent accumulation. The results suggest that lab-contaminated PAHs are more available to amphipods than native PAHs and that differences in bioavailability of lab-contaminated and native PAHs to marine amphipods are related to differences in desorption behavior.
authors.affiliation: Research Institute of Toxicology, University of Utrecht, The Netherlands. r.kraaij@ritox.vet.uu.nl
authors.forename: R H
authors.initials: RH
authors.lastname: Kraaij
authors.forename: S
authors.initials: S
authors.lastname: Ciarelli
authors.forename: J
authors.initials: J
authors.lastname: Tolls
authors.forename: B J
authors.initials: BJ
authors.lastname: Kater
authors.forename: A
authors.initials: A
authors.lastname: Belfroid
mesh_terms: D000818:Animals; D001682:Biological Availability; D003445:Crustacea / Q000502:physiology*; D004305:Dose-Response Relationship, Drug; D004781:Environmental Exposure; D019015:Geologic Sediments / Q000737:chemistry; D007700:Kinetics; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry / Q000493:pharmacokinetics*; D014018:Tissue Distribution
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons