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.

Publication name	ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH  Volume: 20   Issue: 8   Pages: 5471-5480 Published: AUG 2013
Author(s)	Guo, Jian-yang; Wu, Feng-chang; Liao, Hai-qing; Zhao, Xiao-li; Li, Wen; Wang, Jing; Wang, Li-fang; Giesy, John P.
Corresponding author	WU Fengchang  wufengchang@vip.skleg.cn   Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China.
Author(s) from IGCAS	GUO Jianyang, LI Wen, WANG Jing, WANG Lifang

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