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| Assessment of health risk of heavy metals in major crops in mining abandoned reclamation land |
| Received:May 14, 2018 |
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| KeyWord:mining abandoned reclamation land;corn;heavy metal pollution;health risk assessment;geographic weighted regression |
| Author Name | Affiliation | E-mail | | HU Qing-qing | College of Earth and Environmental Sciences, Anhui University of Science and Technology, Huainan 232001, China | | | NIE Chao-jia | College of Earth and Environmental Sciences, Anhui University of Science and Technology, Huainan 232001, China | | | SHEN Qiang | College of Surveying and Mapping, Anhui University of Science and Technology, Huainan 232001, China | | | KONG Chen-chen | College of Earth and Environmental Sciences, Anhui University of Science and Technology, Huainan 232001, China | | | ZHANG Shi-wen | College of Earth and Environmental Sciences, Anhui University of Science and Technology, Huainan 232001, China | mamin1190@126.com |
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| Abstract: |
| Focus on the content of soil heavy metals in mining abandoned reclamation land and the associated food safety problems have obviously increased. In the present study, the southwest area of a sulfur mining wasteland reclamation area was used as the research object. A total of 40 soil samples and 40 corn samples were collected from different points. The content of five heavy metals (Cr, Ni, Cd, As, and Hg) in corn was measured by atomic fluorescence spectrometry, atomic absorption spectrometry, and inductively coupled plasma mass spectrometry. The health risk assessment model of corn was established. Based on the model, combined with geographic weighted regression (GWR) and comprehensive pollution index method, the health risk assessment and correlation analysis of heavy metals of the dominant crops in the reclamation area were conducted. The results showed that the mean level of all heavy metals in corn kernels did not exceed the limit of National Standards for Food Hygiene (GB 2762-2012), but in some samples the level was high. Furthermore, the over-standard rates of Cr, Ni, and Cd were 2.5%, 5.0%, and 10.0%, respectively, with 17.5% of corn samples exceeding the standards. In addition, the assessment results of the single health risk index with corn indicated that the pollution with Cr, Ni, Cd, As, and Hg had no effect on adult and children, whereas, the assessment results of the comprehensive health risk index with corn showed that the pollution with heavy metals could result in health risks for children via food ingestion, thus, requiring special attention. The average annual health risk of Cr in corn was the largest, which exceeded the maximum acceptable risk recommended by the USEPA (1.0×10-4 a-1). Therefore, the prevention and management measures should be strengthened, whereas, the other four elements belonged to the safety level. The correlation analysis of heavy metal content between soil and corn showed that Ni and As had a significant positive correlation (P<0.05) between corn kernels and soil, and Cd showed a very significant positive correlation (P<0.01). The GWR model effectively revealed that the influence of soil on corn was a spatial nonstationary relationship, and it could provide scientific basis for differential treatment and prevention of heavy metal pollution in local crops. |
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