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| Assessment of heavy metal pollution in arable soils in the Poyang Lake area based on the improved matter-element extension method |
| Received:June 03, 2018 |
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| KeyWord:improved matter-element extension model;arable soil;heavy metal;pollution assessment;Poyang Lake area |
| Author Name | Affiliation | E-mail | | ZHAO Jie | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
Jiangxi Provincial Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology, Nanchang 330045, China | | | LUO Zhi-jun | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
Jiangxi Provincial Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology, Nanchang 330045, China | luozj10@163.com | | ZHAO Wan-wan | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
Jiangxi Provincial Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology, Nanchang 330045, China | | | ZHAO Yue | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
Jiangxi Provincial Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology, Nanchang 330045, China | | | SONG Ju | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China
Jiangxi Provincial Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology, Nanchang 330045, China | |
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| Abstract: |
| To examine the contamination status of heavy metals in arable soils in the Poyang Lake area, a total of 252 top soil samples were collected from this area. Contents of the heavy metals Hg, As, Pb, Cd, Cu, Cr and Zn were determined using standard methods. Taking into consideration the fuzziness and uncertainty of soil heavy metal pollution, we used the improved matter-element extension model to assess soil heavy metal pollution. We also applied Hakanson toxic response coefficients to modify the weights determined by the traditional multiple super-scale weighting method. Having thus established an assessment model for heavy metal pollution in arable soils based on the improved matter-element extension model, we compared the evaluation results with the results obtained using traditional evaluation methods. We accordingly found that the average contents of the seven examined heavy metals in soil samples exceeded the local background values, and accumulated to different degrees, with the order of over-standard rates being Cr > Cu > Cd > Hg > Zn > Pb > As. On the basis of the results obtained using the improved matter-element extension model, we could conclude that the heavy metal contamination of soil in the Poyang Lake area was generally at a safe level. The heavy metal content in soils from Duchang County, Hukou County, and Gongqingcheng City was at a safe level, whereas that of soils from other areas was at alert level. The evaluation results obtained using the improved matter-element extension model were essentially consistent with those obtained using the traditional evaluation methods, thereby indicating that the improved matter-element extension model can be applied for the evaluation of soil heavy metal pollution and yields reliable results. |
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