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| Pollution and risk assessment of heavy metals in agricultural soils around a Pb-Zn tailing pond |
| Received:February 27, 2018 |
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| KeyWord:Pb-Zn tailing pond;agricultural soil;heavy metal pollution;Nemerow index method;potential ecological risk index method;fuzzy comprehensive evaluation |
| Author Name | Affiliation | E-mail | | LIANG Ya-ya | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | YI Xiao-yun | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China | xyyi@scut.edu.cn | | DANG Zhi | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China | | | WANG Qin | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | GAO Shuang-quan | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | TANG Jie | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | ZHANG Zheng-fang | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | |
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| Abstract: |
| In order to study the heavy metal pollution of agricultural soils surrounding a Pb-Zn tailing pond in Guangdong Province and evaluate the risk of heavy metals to the agricultural soils, the contents of Pb, Zn, Cu, Cr, Cd, Ni, and As in the soils were analyzed. The risk of heavy metals to the agricultural soils was assessed via three methods:the Nemerow index method, potential ecological risk index method, and fuzzy comprehensive evaluation method. Results showed that the contents of heavy metals in paddy soils were higher than those in vegetable plantation soils. The contents of Pb, Zn, Cu, Cd, Ni, and As in some soil samples were higher than the criteria of environmental quality standards for agricultural soils, whereas the Cr contents were lower than the critical level. The exceeded rate decreased in the order of Cd > Zn > As > Pb > Ni > Cu. Correlation analysis showed that extremely significant correlations existed among heavy metal contents in the soils, and principal component analysis showed that Pb, Zn, Cu, Cd, and As were dominant factors of soil environmental quality in the study areas. Based on the three evaluation methods, we concluded that the results of the Nemerow index method and fuzzy comprehensive evaluation method showed that the soils were in the degree of heavy pollution, whereas the potential ecological risk index showed that the soils were classified as moderate potential ecological risk. According to the analysis of contents and risk assessment of heavy metals in contaminated soil, the farmland soil was contaminated by a variety of heavy metals, with Cd pollution the most serious. There was some degree of heavy metal risk to the farmland soil. Each evaluation method has its advantages. The appropriate method for evaluating heavy metal pollution of soil should be carefully chosen based on the evaluation purpose. |
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