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| Pollution characteristics and ecological risks of organochlorine pesticides in multiple-media of farmland subsidence water in Yangzhuang coal mine area, China |
| Received:December 18, 2019 |
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| KeyWord:farmland;coal mining subsidence area;organochlorine pesticides;source analysis;multiple-media;Panji No.1 coal mine |
| Author Name | Affiliation | E-mail | | ZHOU Xiao-fang | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | | | GAO Liang-min | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | gaolmin@163.com | | CHEN Xiao-qing | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | | | ZHA Fu-geng | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | | | WANG Xin-fu | School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China | |
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| Abstract: |
| In this study, the pollution characteristics and potential ecological risks of organochlorine pesticides (OCPs)in farmland subsidence water affected by coal mining activities were analyzed. Gas chromatography-mass spectrometry (GC-MS)were used to characterize the mass concentrations of OCPs in water and sediment in Huainan Panji No. 1 coal mine, the subsidence area of Yangzhuang farmland, of which the characteristic pollutants are hexachlorocyclohexanes (HCHs)and dichlorodiphenyltrichloroethanes (DDTs). In addition, ArcGIS was used to study the distribution characteristics and sources of the OCPs, and the consensus-based sediment quality guidelines method (CB-SQGs)was selected to analyze the potential ecological risks. The results showed that the mass concentrations of dissolved ΣOCPs in the Yangzhuang subsidence area ranged from 72.06 ng·L-1 to 218.89 ng·L-1, with an average value of 167.32 ng·L-1. Moreover, the suspended and sedimentary ΣOCPs were 199.35~405.04 ng·g-1 dw and 24.34~1 247.32 ng·g-1 dw, with average values of 277.07 ng·g-1 dw and 238.78 ng·g-1 dw, respectively. The mass concentrations of the suspended and sedimentary OCPs showed decreasing trends from upstream to downstream with the water flow. Further, the HCHs and DDTs in Yangzhuang subsidence water mainly from lindane and agricultural dicofol, respectively. The dissolved OCPs were lower than the national Class Ⅲ water quality standard and thus posed low ecological risk. The suspended and sedimentary states were at medium and high ecological risk levels, respectively, and the source toxicity rates of the sedimentary OCPs were slightly lower than those of the suspended OCPs. |
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