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| Source identification and pollution assessment of heavy metals in farmland soils around a pyrite mining area in Jiang'an County, Sichuan Province, China |
| Received:August 21, 2018 |
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| KeyWord:pyrite mining area;heavy metal;farmland soil;pollution assessment;source identification |
| Author Name | Affiliation | | LI Zhi-tao | Chinese Academy for Environmental Planning, Beijing 100012, China
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China | | WANG Xia-hui | Chinese Academy for Environmental Planning, Beijing 100012, China | | HE Jun | Chinese Academy for Environmental Planning, Beijing 100012, China | | JI Guo-hua | Chinese Academy for Environmental Planning, Beijing 100012, China | | HE Jun | Chinese Academy for Environmental Planning, Beijing 100012, China | | ZHU Wen-hui | Chinese Academy for Environmental Planning, Beijing 100012, China |
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| Abstract: |
| To investigate the comprehensive influence of a pyrite mine on farmland soils in Jiang'an county, Sichuan Province, 207 surface soil samples and 10 background samples were collected to determine pH values and heavy metal concentrations. A multivariate analysis was applied to identify the potential sources of heavy metals. Pollution index assessment and potential ecological risk were also analyzed. The following results were obtained:background heavy metal content in the studied farmland soils was higher than the background values nationwide and Sichuan Province owing to the influence of the mining area, indicating the enrichment of heavy metals in the soil to different degrees; multivariate analysis results showed similar sources for Cr, Ni, Cu, and Cd, which was related to the industrial activity of the pyrite mining area; Hg and As were mainly affected by the parent soil materials; and Zn might originate from two sources; Cd seriously polluted the studied farmland soils with an average content of 1.55 mg·kg-1 and the percentage of exceeding standard accounted for 99.03%, followed by Cu (37.20%); the study area was at a moderate pollution level as a whole; and the potential ecological risk assessment was significantly influenced by the background reference values; when the background content of heavy metals in the studied area was selected as the reference value, 79.71% of the samples were at the mild potential ecological risk level, which was mainly attributed to Cd and Hg. Therefore, the industrial activity of the pyrite mining area led to severe Cd pollution in the surrounding farmland soil and the present study showed the potential to provide a scientific basis for the prevention of subsequent pollution. |
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