title: Concentrations and risk assessment of polychlorinated biphenyls and polybrominated diphenyl ethers in surface sediments from the East Lake, China.
abstract: The concentrations of polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in surface sediment samples collected from the East Lake, China in winter 2012 and summer 2013 were analyzed in this study. The total PCB and PBDE concentrations ranged from not detected to 107.1 ng g(-1) dw and from 9.7 to 151.3 ng g(-1) dw, respectively. PCB-28, 101 and 180 were dominant congeners in both winter and summer. BDE-28 (44 %) was the dominant congener in winter and summer, followed by BDE-99 (28 %) and BDE-47 (26 %). The concentrations of PCBs in the sediment samples collected in summer were higher than those in winter, while the concentrations of PBDEs did not show much seasonal variations. Source analysis showed that the PCBs probably originated from urban runoff, industrial pollution and atmospheric deposition, and the PBDEs probably originated from historical usage of penta-BDE mixtures. Potential eco-toxicological risks caused by PCBs were found in about 5 % of the sampling sites; PBDEs had moderate eco-toxicological risk in 80 % sampling sites in the East Lake, China.
authors.affiliation: Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Yun
authors.forename: Yuyi
authors.initials: Y
authors.lastname: Yang
authors.forename: Minxia
authors.initials: M
authors.lastname: Liu
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
mesh_terms: D002681:China; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D055768:Halogenated Diphenyl Ethers / Q000032:analysis*; D060106:Lakes / Q000737:chemistry*; D011075:Polybrominated Biphenyls / Q000032:analysis; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D018570:Risk Assessment; D012621:Seasons; D062206:Spatial Analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: C477694:2,2',4,4',5-brominated diphenyl ether; D055768:Halogenated Diphenyl Ethers; D011075:Polybrominated Biphenyls; D014874:Water Pollutants, Chemical; C511295:2,2',4,4'-tetrabromodiphenyl ether; C081766:2,4,4'-trichlorobiphenyl; D011078:Polychlorinated Biphenyls; C533760:tribromodiphenyl ether 28