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| Residue characteristics, sources and risk assessment of organochlorine pesticides in riparian soils of the Yangtze River Basin |
| LU Yin-tao1,2, XUE Hong-hui1,2, ZHANG Shi-chao3, PEI Jin1,2, XIANG Xin-xin1,2, WANG Xue-wen1,2, SUN Shao-bin1,2, YAO Hong1,2 |
1. School of Civil and Architectural Engineering, Beijing Jiaotong University Beijing 100044, China;
2. Beijing Key Laboratory of Typical Pollutant Control and Water Quality Protection in Water, Beijing 100044, China;
3. Institute of Energy Conservation and Environmental Protection, China Railway Science Research Institute Group, Beijing 100081, China |
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Abstract The soils around the main stream and the tributaries of the Yangtze River Basin were selected as the research medium, and the contents of 13organochlorine pesticides (OCPs) in the topsoil were analyzed. The sources were analyzed by isomer ratio method and principal component analysis, and the health risk assessment was discussed. The results showed that the concentration of ∑13OCPs in the surface soil of the Yangtze River Basin ranged from 8.94 to 77.79ng/g, with an average content of 24.55ng/g. BHC (HCHs) and DDTs were the dominant components. The concentration level of OCPs was similar between upstream and downstream, but the level in midstream showed higher than that in upstream and downstream. However the level of OCPs concentration in Yangtze River Basin showed that is at a medium level in the world. The HCHs in the soil were mainly from the historical residues of lindane, while DDTs were mainly derived from the recent import of dicofol and the illegal use of industrial DDTs. The health risk assessment in the midstream was higher than that in the upstream and downstream of Yangtze River Basin. The Risk value of carcinogenic risks ranged from 10-6 to 10-4 in Chenglingji, Nanzui and Xiangyin, which indicated that there were certain carcinogenic risks to children in these three areas.
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Received: 15 February 2019
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