title: Temporal trends of PCBs, PCDD/Fs and PBDEs in soils from an E-waste dismantling area in East China.
abstract: The temporal trends of polychlorinated biphenyls (PCBs), polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and polybrominated diphenyl ethers (PBDEs) were investigated in soils from an E-waste dismantling area in East China between 2005 and 2011. Isotope dilution high resolution gas chromatography/high resolution mass spectrometry (HRGC/HRMS) was employed for the sample analysis. PCB levels declined as expected, while PCDD/Fs generally remained at a constant level during the sampling period, and PBDE concentrations tended to be slightly lower after 2007 although the decline was not statistically significant. The congener profiles indicated that lowly-halogenated congeners of these persistent organic pollutants (POPs) accounted for the decreasing levels and relative proportions of the POPs, suggesting that they have been gradually eliminated from the field soil over the years. However, the concentration levels of some heavy congeners (e.g., CB-209, OCDD and OCDF) showed different trends from those of the lighter ones. The general tendencies of the three types of POPs in soils were consistent with those reported in other studies in this area. The results implied that the enhanced regulations and centralized dismantling action introduced in 2005 might exert a limited influence on these three types of POPs in soils during the sampling period.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. qhzhang@rcees.ac.cn.
authors.forename: Pu
authors.initials: P
authors.lastname: Wang
authors.forename: Haidong
authors.initials: H
authors.lastname: Zhang
authors.forename: Jianjie
authors.initials: J
authors.lastname: Fu
authors.forename: Yingming
authors.initials: Y
authors.lastname: Li
authors.forename: Thanh
authors.initials: T
authors.lastname: Wang
authors.forename: Yawei
authors.initials: Y
authors.lastname: Wang
authors.forename: Daiwei
authors.initials: D
authors.lastname: Ren
authors.forename: Patrick
authors.initials: P
authors.lastname: Ssebugere
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Zhang
authors.forename: Guibin
authors.initials: G
authors.lastname: Jiang
mesh_terms: D001572:Benzofurans / Q000032:analysis*; D002681:China; D000072338:Dibenzofurans, Polychlorinated; D004581:Electronics; D004784:Environmental Monitoring; D055768:Halogenated Diphenyl Ethers / Q000032:analysis*; D007220:Industrial Waste / Q000032:analysis*; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*; D064091:Waste Disposal Facilities
chemical_list: D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D055768:Halogenated Diphenyl Ethers; D007220:Industrial Waste; D000072317:Polychlorinated Dibenzodioxins; D012989:Soil Pollutants; C086401:pentabromodiphenyl ether; D011078:Polychlorinated Biphenyls