title: Persistent organic pollutants in soil near the Changwengluozha glacier of the Central Tibetan Plateau, China: their sorption to clays and implication.
abstract: Twenty-seven soil samples were collected at ca. 5,000 m from the Changwengluozha glacier. In addition to soil components, the concentration of 23 organochlorine pesticides (OCPs) and 16 polycyclic aromatic hydrocarbons (PAHs) were analyzed. Clay minerals were found to play a key role in the accumulation of OCPs/PAHs in soil. The sorption ratio of chemical to clay was ordered in the OCPs and PAHs to the vapor pressure in a negatively correlated fashion. Because of the negative relationship between vapor pressure and the soil-air partition coefficients (KSA), it was understood that the higher sorption ratio responded to a higher KSA, which indicated the fate of the contaminants in soil. The soil near the Changwengluozha glacier functioned as a "sink" for OCPs in the decreasing order of 2,4'-DDT, 4,4'-DDD, HCB, δ-HCH, and α-HCH and for PAHs in an decreasing order of Pyr, Flu, Fl, Ace, and Acy.
authors.affiliation: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China; School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China. Electronic address: yuangl@cugb.edu.cn.
authors.forename: Guo-Li
authors.initials: GL
authors.lastname: Yuan
authors.affiliation: School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China.
authors.forename: Jian-Xun
authors.initials: JX
authors.lastname: Qin
authors.affiliation: School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China.
authors.forename: Xin-Xin
authors.initials: XX
authors.lastname: Lang
authors.affiliation: School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China.
authors.forename: Gen-Hou
authors.initials: GH
authors.lastname: Wang
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D002681:China; D000077215:Clay; D003634:DDT / Q000032:analysis; D004784:Environmental Monitoring; D001556:Hexachlorocyclohexane / Q000032:analysis; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D046448:Ice Cover / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D000538:Aluminum Silicates; D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D011084:Polycyclic Aromatic Hydrocarbons; D012987:Soil; D012989:Soil Pollutants; C040534:alpha-hexachlorocyclohexane; C086916:delta-hexachlorocyclohexane; D001556:Hexachlorocyclohexane; D003634:DDT; C016340:o,p'-DDT; D000077215:Clay
keywords: Clay minerals; Glacier; Persistent organic pollutants; Surface soil; Tibetan Plateau