title: Sedimentary record of polycyclic aromatic hydrocarbons and DDTs in Dianchi Lake, an urban lake in Southwest China.
abstract: Unique time trends of polycyclic aromatic hydrocarbons (PAHs) and dichlorodiphenyltrichloroethanes (DDTs) were found in a dated sediment core from Dianchi Lake (DC), an urban lake in Southwest China. The temporal trend of PAHs in DC was not only different from those in China's coastline and remote lakes of China, but also different from those in more developed countries. Identification of sources suggested that PAHs in DC originated primarily from domestic combustion of coal and biomass. However, a change of source from low- and moderate-temperature combustion to high-temperature combustion processes was observed. Different from those in China's coastline and some developed countries, the temporal trend of DDTs in DC mirrored the historical usage of DDTs in China, with erosion of soils and surface runoff from its drainage area the most likely routes of DDT introduction to the lake. Rapid urbanization and industrialization in its catchment, effective interception of point-source pollution, and changes in sources of energy during the last few decades have significantly influenced the vertical profiles of PAHs in DC.
authors: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China.
authors: Jian-yang
authors: JY
authors: Guo
authors: Feng-chang
authors: FC
authors: Wu
authors: Hai-qing
authors: HQ
authors: Liao
authors: Xiao-li
authors: XL
authors: Zhao
authors: Wen
authors: W
authors: Li
authors: Jing
authors: J
authors: Wang
authors: Li-fang
authors: LF
authors: Wang
authors: John P
authors: JP
authors: Giesy
mesh_terms: D002681:China; D002947:Cities; D003634:DDT / Q000032:analysis* / Q000266:history; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis*; D049673:History, 20th Century; D049674:History, 21st Century; D060106:Lakes; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis* / Q000266:history; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000266:history
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D003634:DDT