title: Hexabromocyclododecane (HBCD) and tetrabromobisphenol A (TBBPA) in riverine and estuarine sediments of the Pearl River Delta in southern China, with emphasis on spatial variability in diastereoisomer- and enantiomer-specific distribution of HBCD.
abstract: Hexabromocyclododecane (HBCD) and tetrabromobisphenol A (TBBPA) were measured in surface sediments in the Pearl River Delta, southern China. The concentrations ranged from 0.06 to 304 ng/g dry weight for TBBPA and from 0.03 to 31.6 ng/g for total HBCD. The correlations between the TBBPA and HBCD concentrations were significant in rivers (Dongjiang, Zhujiang, Beijiang, and Dayanhe Rivers) with local input sources but not significant in the Xijiang River and Pearl River Estuary without local sources. HBCD was dominated by γ-HBCD (averaged 52.5-75.0%), whereas α-HBCD contributions were relatively high in sediments from the urban areas. The enantiomeric fractions of γ-HBCD in the sediments (averaged from 0.431 ± 0.035 to 0.479 ± 0.010) differed significantly from that in HBCD technical product except for samples from the e-waste area (Dayanhe River, 0.488 ± 0.091). This suggests that enantioselective biotransformation of HBCD occurs in the aquatic environment in this region.
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: An-Hong
authors.initials: AH
authors.lastname: Feng
authors.forename: She-Jun
authors.initials: SJ
authors.lastname: Chen
authors.forename: Man-Ying
authors.initials: MY
authors.lastname: Chen
authors.forename: Ming-Jing
authors.initials: MJ
authors.lastname: He
authors.forename: Xiao-Jun
authors.initials: XJ
authors.lastname: Luo
authors.forename: Bi-Xian
authors.initials: BX
authors.lastname: Mai
mesh_terms: D002681:China; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D006842:Hydrocarbons, Brominated / Q000032:analysis* / Q000737:chemistry; D011075:Polybrominated Biphenyls / Q000032:analysis* / Q000737:chemistry; D045483:Rivers / Q000737:chemistry; D012623:Seawater / Q000737:chemistry; D013237:Stereoisomerism; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data
chemical_list: D006842:Hydrocarbons, Brominated; D011075:Polybrominated Biphenyls; D014874:Water Pollutants, Chemical; C089796:hexabromocyclododecane; C020806:tetrabromobisphenol A