Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 20, Issue 8, Pages 5471-5480Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-013-1562-8
Keywords
PAHs; Dichlorodiphenyltrichloroethane; Sediment core; Pesticides; Combustion
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Funding
- National Natural Science Foundation of China [40973087]
- China's National Basic Research Program: Water environmental quality evolution and water quality criteria in lakes [2008CB418200]
- program of High Level Foreign Experts [GDW20123200120]
- State Administration of Foreign Experts Affairs, People's Republic of China
- Canada Research Chair program
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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.
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