title: [Polychlorinated biphenyls in house dust at an e-waste site and urban site in the Pearl River Delta, southern China: sources and human exposure and health risks].
abstract: Polychlorinated biphenyls (PCBs) were measured in house dust from an e-waste site and urban site in the Pearl River Delta, southern China. The PCB concentrations in house dust at the e-waste site ranged from 12.4 to 87 765 ng x g(-1), with an average of 10 167 ng x g(-1). There was no significant difference in the PCB concentrations between indoor and outdoor dust. The PCB homologue pattern was dominated by tri-, penta-, hexa-, and tetra-CBs, which was not similar to that in Chinese technical PCB product. There was also no significant difference in the PCB compositions between indoor and outdoor dust. PCB sources in house dust at the e-waste site were apportioned by chemical mass balance (CMB) model. The results showed that the PCBs were derived primarily from Aroclor 1262 (36.7% ), Aroclor 1254 (26.7%), Aroclor 1242 (21.4%), and Aroclor 1248 (18.5%). The daily exposure doses were 42, 17, and 2.9 ng x (kg x d)(-1) for toddlers, children/adolescents, and adults in the e-waste area, respectively. Risk assessment indicated that the hazard quotients were higher than 1 for toddlers and children/adolescents indicating adverse effects for them. The lifetime average excess carcinogenic risk for population in the e-waste area was 4.5 x 10(-5), within the acceptable range of U. S. Environmental Protection Agency. The mean concentrations of PCBs in house dust in Guangzhou was 48.7 ng x g(-1). The low PCB level is consistent with the fact that technical PCBs were not widely used in China in the past. The risks of exposure to PCBs via house dust in Guangzhou are very low.
authors.forename: Zhi-Cheng
authors.initials: ZC
authors.lastname: Zhu
authors.forename: She-Jun
authors.initials: SJ
authors.lastname: Chen
authors.forename: Nan
authors.initials: N
authors.lastname: Ding
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Xiao-Jun
authors.initials: XJ
authors.lastname: Luo
authors.forename: Bi-Xian
authors.initials: BX
authors.lastname: Mai
mesh_terms: D000293:Adolescent; D000328:Adult; D016902:Air Pollution, Indoor / Q000032:analysis*; D001140:Aroclors / Q000032:analysis; D002648:Child; D002675:Child, Preschool; D002681:China; D002947:Cities; D004391:Dust / Q000032:analysis*; D059029:Electronic Waste; D004781:Environmental Exposure; D006801:Humans; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D018570:Risk Assessment; D014481:United States
chemical_list: D001140:Aroclors; D004391:Dust; D011078:Polychlorinated Biphenyls