John Wiley & Sons, Ltd.

Bioaccumulation kinetics of polybrominated diphenyl ethers and decabromodiphenyl ethane from field‐collected sediment to the oligochaete, Lumbriculus variegatus

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The extensive use of polybrominated diphenyl ethers (PBDEs) and decabromodiphenyl ethane (DBDPE) has made them widespread contaminants in abiotic environment, but data regarding their bioavailability to benthic organisms are sparse. Bioaccumulation potential of PBDEs and DBDPE from field‐collected sediment to the oligochaete Lumbriculus variegatus was evaluated using a 49‐d exposure including a 28‐d uptake and a 21‐d elimination phases. All PBDEs and DBDPE were bioavailable to the worms with biota‐sediment accumulation factors (BSAFs) ranging from 0.0210 to 4.09 g organic carbon/g lipid. Yet the bioavailability of highly‐brominated compounds (BDE‐209 and DBDPE) was poor compared to other PBDEs, and this was confirmed by their relatively low freely dissolved concentrations (Cfree) measured by solid phase microextraction. The inverse correlation between BSAFs and hydrophobicity was explained by their uptake (ks) and elimination (ke) rate constants. While ke changed little for PBDEs, ks decreased significantly when chemical hydrophobicity increased. The difference in bioaccumulation kinetics of BFRs in fish and the worms was explained by their physiological difference and the presence of multiple elimination routes. The appropriateness of 28‐d bioaccumulation testing for BSAF estimation was validated for PBDEs and DBDPE. Additionally, Cfree was shown to be a good indicator of the bioavailability. Environ Toxicol Chem © 2013 SETAC

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