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| Evaluation of heavy metal pollution in farmland soil around an abandoned silicon plant in Yunnan |
| Received:July 23, 2021 |
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| KeyWord:heavy metals in soil;pollution assessment;influence index of comprehensive quality;silicon factory |
| Author Name | Affiliation | E-mail | | LIU Yang | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LIU Mingqing | Nanjing Institute of Environmental Sciences, MEE, Nanjing 210042, China | | | WANG Lei | Nanjing Institute of Environmental Sciences, MEE, Nanjing 210042, China | | | YIN Aijing | Nanjing Institute of Environmental Sciences, MEE, Nanjing 210042, China | | | HUANG Zhonglin | Guangxi Bossco Environmental Protection Technology Co., Ltd., Nanning 530000, China | | | YAO Dandan | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | DAI Wei | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | WANG Ning | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | WANG Hui | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | hwang@issas.ac.cn |
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| Abstract: |
| To study the pollution status of heavy metals in farmland around an abandoned silicon factory in Yunnan Province and evaluate the impact of heavy metals on soil environmental quality, the Cd, Cr, Cu, Ni, Pb, Zn, Hg, and As contents of soil were analyzed. Soil heavy metal pollution was evaluated using the single pollution index method, the Nemerow index method, and the influence index of the comprehensive quality method. In soil from the study area, the average values of Cd, Cr, Cu, Ni, Pb, Zn, Hg, and As were 0.39, 82.04, 33.24, 44.85, 50.62, 109.20, 0.12 mg·kg-1, and 34.40 mg·kg-1, respectively, which were 1.77, 1.26, 0.72, 1.06, 1.25, 1.22, 2.00 times, and 1.87 times of the corresponding Yunnan soil background value. Correlation analysis of soil heavy metals showed that Cd, Zn, Hg, As, and Pb were positively correlated with each other, which likely originate from the soot of the waste silicon plant. Cr, Cu, and Ni were positively correlated with each other and negatively correlated with or not correlated with other heavy metals. These metals may originate from parent materials or other pollution sources. The single pollution index showed that As in the soil exceeded the standard and was the main pollutant in this area. The Nemerow index showed that the soil of orchards（S1）and paddy fields（S2）near the silicon plant were slightly polluted, while the soil of paddy fields（S3）was far away from the silicon plant was not polluted. Similarly, the influence index of comprehensive quality showed that the soil of S1 and S2 near the silicon plant were in a sub-polluted state, while the S3 far away from the silicon plant were in a clean state. Therefore, attention should be paid to the heavy metal pollution of agricultural land in this region, and priority should be given to the remediation of As pollution. |
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