title: One century sedimentary records of polycyclic aromatic hydrocarbons, mercury and trace elements in the Qinghai Lake, Tibetan Plateau.
abstract: Sediments from a remote lake of northeastern Tibetan Plateau were analyzed for polycyclic aromatic hydrocarbons (PAHs) and trace metals. USEPA priority PAHs, ranged from 11 in 1860 to 279 ng g(-1) in 2002, while, the deposition fluxes were in the range of 0.2-11.4 ng cm(-2) yr(-1). Similarly, from 1860 to 2002, an increased trend of Hg flux was observed (0.5-3.2 ng cm(-2) yr(-1)). Remarkable increase of PAHs and Hg concentration began from 1970, nearly the same period of the "Reform and Open" Policy had been embarked (1978) in China. Good correlations were found between concentrations of Pb, Zn, Cd, As, Hg, and PAHs, which suggested the sources of these chemicals in the sediment is analogous, likely from anthroprogenic sources. Based on isomer ratios, PAHs in core were dominantly from the incomplete combustion of coal. Owing to the proximity to dust source area (Qaidam Basin) and the close association between PAHs, Hg, Pb, and particle matters, atmospheric dust-transport and deposition might be the main pathways that pollutants enter into Qinghai Lake.
authors.affiliation: Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China. wangxp@itpcas.ac.cn
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Wang
authors.forename: Handong
authors.initials: H
authors.lastname: Yang
authors.forename: Ping
authors.initials: P
authors.lastname: Gong
authors.forename: Xin
authors.initials: X
authors.lastname: Zhao
authors.forename: Guangjian
authors.initials: G
authors.lastname: Wu
authors.forename: Simon
authors.initials: S
authors.lastname: Turner
authors.forename: Tandong
authors.initials: T
authors.lastname: Yao
mesh_terms: D001272:Atmosphere / Q000737:chemistry; D004784:Environmental Monitoring; D005618:Fresh Water / Q000737:chemistry; D019015:Geologic Sediments / Q000737:chemistry*; D008628:Mercury / Q000032:analysis*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D018609:Tibet; D014131:Trace Elements / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D014131:Trace Elements; D014874:Water Pollutants, Chemical; D008628:Mercury