title: Bioaccumulation kinetics of polybrominated diphenyl ethers and decabromodiphenyl ethane from field-collected sediment in the oligochaete, Lumbriculus variegatus.
abstract: The extensive use of polybrominated diphenyl ethers (PBDEs) and decabromodiphenyl ethane (DBDPE) has made them widespread contaminants in abiotic environments, but data regarding their bioavailability to benthic organisms are sparse. The bioaccumulation potential of PBDEs and DBDPE from field-collected sediment was evaluated in the oligochaete Lumbriculus variegatus using a 49-d exposure, including a 28-d uptake and a 21-d elimination phase. All PBDEs and DBDPE were bioavailable to the worms with biota-sediment accumulation factors (BSAFs) ranging from 0.0210 g organic carbon/g lipid to 4.09 g organic carbon/g lipid. However, the bioavailability of highly brominated compounds (BDE-209 and DBDPE) was poor compared with that of other PBDEs, and this was confirmed by their relatively low freely dissolved concentrations (C(free)) measured by solid-phase microextraction. The inverse correlation between BSAFs and hydrophobicity was explained by their uptake (k(s)) and elimination (k(e)) rate constants. While ke changed little for PBDEs, ks decreased significantly when chemical hydrophobicity increased. The difference in bioaccumulation kinetics of brominated flame retardants 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. In addition, C(free) was shown to be a good indicator of bioavailability.
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, China.
authors.forename: Baozhong
authors.initials: B
authors.lastname: Zhang
authors.forename: Huizhen
authors.initials: H
authors.lastname: Li
authors.forename: Yanli
authors.initials: Y
authors.lastname: Wei
authors.forename: Jing
authors.initials: J
authors.lastname: You
mesh_terms: D000818:Animals; D001969:Bromobenzenes / Q000493:pharmacokinetics*; D002681:China; D005411:Flame Retardants / Q000493:pharmacokinetics*; D019015:Geologic Sediments / Q000737:chemistry*; D055768:Halogenated Diphenyl Ethers / Q000493:pharmacokinetics*; D057927:Hydrophobic and Hydrophilic Interactions; D007700:Kinetics; D009835:Oligochaeta / Q000378:metabolism*; D052617:Solid Phase Microextraction; D064091:Waste Disposal Facilities; D014874:Water Pollutants, Chemical / Q000493:pharmacokinetics*
chemical_list: D001969:Bromobenzenes; D005411:Flame Retardants; D055768:Halogenated Diphenyl Ethers; D014874:Water Pollutants, Chemical; C491509:decabromodiphenyl ethane; C010902:decabromobiphenyl ether
keywords: Bioaccumulation kinetics; Decabromodiphenyl ethane (DBDPE); Field sediment; Lumbriculus variegatus; Polybrominated diphenyl ethers (PBDEs)