title: Source and risk assessment of PCBs in sediments of Fenhe reservoir and watershed, China.
abstract: The concentrations of polychlorinated biphenyls (PCBs) in sediments from the Fenhe reservoir and watershed were detected at 28 sites in wet and dry seasons. The ∑(123)PCBs ranged from n.d. to 126.49 ng g(-1) dw. The dominated congeners were tri-PCBs (34.29%) and tetra-PCBs (24.05%). In the Fenhe reservoir, ∑(123)PCBs presented a decreasing trend, while percentages of low chlorinated congeners showed an increasing trend. For the temporal variations, PCBs homologues profiles of sediment samples and spatial distribution of ∑(123)PCBs for the two periods were similar (with CD = 0.021 and r(2) = 0.999 respectively), although PCBs concentrations in the wet season were significantly higher than in the dry season. PCA was applied to analyze the possible sources for PCBs, suggesting that PCBs might be mainly influenced by Aroclor 1016 and 1242. Compared with 3 established sediment quality guidelines, levels of PCBs in sediments of the investigated watershed might have a potential biological impact, especially in the wet season.
authors.affiliation: College of Resources and Environment, Shanxi Agricultural University, Taigu, Shanxi 030801, China.
authors.forename: Wei-Hong
authors.initials: WH
authors.lastname: Li
authors.forename: Ying-Ze
authors.initials: YZ
authors.lastname: Tian
authors.forename: Guo-Liang
authors.initials: GL
authors.lastname: Shi
authors.forename: Chang-Sheng
authors.initials: CS
authors.lastname: Guo
authors.forename: Yin-Chang
authors.initials: YC
authors.lastname: Feng
authors.forename: Xiu-Ping
authors.initials: XP
authors.lastname: Yue
mesh_terms: D002681:China; D004784:Environmental Monitoring; D005618:Fresh Water / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D018570:Risk Assessment; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data; D014881:Water Supply / Q000706:statistics & numerical data
chemical_list: D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls