title: [Levels of polychlorinated biphenyls in Tibetan and Yi adolescents' hair from Liangshan Prefecture, Sichuan Province].
abstract: Adolescents' (11-19 years old) hair samples (n =39) collected from Liangshan prefecture, Sichuan Province were analyzed for 12 dioxin-like polychlorinated biphenyl(DL-PCBs) congeners by gas chromatography-mass spectrometry(GC-MS). The levels and distribution characteristics of DL-PCBs in Tibetan and Yi Adolescents' hair were studied, meanwhile, the relationships between the levels of DL-PCBs and the nationalities, eating habits and genders were addressed. The results indicated that the average concentration of PCBs was (102.2 +/- 14. 3) pg x g(-1) with the range from 9.6 pg x g(-1) to 991.6 pg x g(-1). The concentration levels of this region were relatively low. PCB-77, PCB-105 and PCB-118 were the major congeners, contributing to 84.7% of the total. The levels of PCBs in Yi teenagers' hair were higher than those in Tibetan, and the concentration in hair was related to the frequency of eating meats and drinking milk per week. It might be attributed to the different eating habits of these two nationalities. When gender was considered, significantly higher concentrations were found in female than in male (P < 0.05).
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhou
authors.forename: Yi-ming
authors.initials: YM
authors.lastname: Sun
authors.forename: Jun
authors.initials: J
authors.lastname: Jin
authors.forename: Jian-rong
authors.initials: JR
authors.lastname: Lei
authors.forename: Gui-ping
authors.initials: GP
authors.lastname: Qin
authors.forename: Xue-zhu
authors.initials: XZ
authors.lastname: He
authors.forename: You-jing
authors.initials: YJ
authors.lastname: Lin
mesh_terms: D000293:Adolescent; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D006197:Hair / Q000737:chemistry*; D006801:Humans; D008297:Male; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D055815:Young Adult
chemical_list: C067940:2,3,3',4,4'-pentachlorobiphenyl; C070055:2,3',4,4',5-pentachlorobiphenyl; D011078:Polychlorinated Biphenyls; C028451:3,4,3',4'-tetrachlorobiphenyl