Levels, distributions, and source identification of organochlorine pesticides
in the topsoils in Northeastern China |
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Authors: | WANG Xu REN Nanqi QI Hong MA Wanli and LI Yifan |
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Institution: | 1. International Joint research Center for Persistent Toxic Substances IJRC-PTS, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology SKLUWRE, HIT, Harbin 150090, China 2. International Joint research Center for Persistent Toxic Substances IJRC-PTS, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology SKLUWRE, HIT, Harbin 150090, China;Science and Technology Branch, Environment Canada, Toronto, Ontario, M3H 5T4, Canada |
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Abstract: | Seventeen topsoil samples (9 urban, 4 suburban, 3 rural and 1 background) were collected in/around Harbin, a typical city in
northeast of China, to measure concentration levels of organocholrine pesticides (OCPs) in topsoil of Northeastern China in 2006.
Hexachlorohexanes (HCH), dichlorodiphenyltrichloroethane (DDT), and hexachlorobenzene (HCB) were detected in soil samples with
mean concentrations (in pg/g dry weight (dw)) of 7120, 5425, and 1039, respectively. The mean concentrations for other OCPs were
very low, 4.8 pg/g dw for chlordane and 3.3 pg/g dw for endosulfan. Source identification analysis reveals that all OCPs found in soil
samples were due to historical use of these chemicals or from other source regions through long- and short-range atmospheric transport.
DDT was mainly used in the rural sites, whereas the sources of HCB, chlordane and endosulfan were mainly in the urban area. HCH
was found almost equally in both urban and rural area. Soil concentrations of all detected OCPs, except HCHs, in and around Harbin
were much lower than those in the southeast of China, which is expected since the use of these OCPs in the former was much lower
than that in the latter, however higher HCH concentrations in and around Harbin than those found in most places of the Southeast China
is not expected. It is suggested that high HCH concentration in soil of Northeast China was most likely due to long-range atmospheric
transport (LRAT) from Southeast China and the cold condensation process. |
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Keywords: | organocholrine pesticides (OCPs) soil residue |
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