title: Selective supercritical fluid extraction to identify aged sediment-bound PCBs available for uptake by eel.
abstract: A naturally contaminated sediment was partially extracted with selective supercritical fluid extraction (SFE) to remove a fraction of supposedly bioavailable PCBs from the matrix. Eels (Anguilla anguilla) were cultured in systems with untreated and pre-extracted sediment, respectively, and it was shown that the SFE treatment selectively removed bioavailable PCBs from the sediment, since relative biota-to-sediment accumulation factors (BSAFs) for the eight studied PCB congeners were much lower in the pre-extracted than in the untreated system at the end of the study. Relative BSAF values decreased with about the same relative amount for all eight congeners, independent of the degree of chlorination and the initial concentration in the sediment. The results demonstrate the ability of SFE to selectively remove sediment-bound PCBs that are available for uptake by the eels, thus demonstrating the feasibility of using selective SFE to estimate bioavailability of PCBs in sediments.
authors.affiliation: Department of Analytical Chemistry, Lund University, P.O. Box 124, 221 00 Lund, Sweden.
authors.forename: Tobias
authors.initials: T
authors.lastname: Nilsson
authors.forename: Johan
authors.initials: J
authors.lastname: Häkkinen
authors.forename: Per
authors.initials: P
authors.lastname: Larsson
authors.forename: Erland
authors.initials: E
authors.lastname: Björklund
mesh_terms: D000818:Animals; D001682:Biological Availability; D025924:Chromatography, Supercritical Fluid / Q000379:methods; D004524:Eels / Q000378:metabolism*; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000032:analysis* / Q000493:pharmacokinetics; D012989:Soil Pollutants / Q000032:analysis* / Q000493:pharmacokinetics; D013548:Sweden; D013997:Time Factors
chemical_list: D012989:Soil Pollutants; D011078:Polychlorinated Biphenyls