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| Risk assessment of nickel in soils and crops around the Ni-Mo polymetallic mining area in Songlin, Zunyi, China |
| Received:June 06, 2018 Revised:August 01, 2018 |
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| KeyWord:Ni-Mo polymetallic mining area;soil pollution;crop;health risk assessment |
| Author Name | Affiliation | E-mail | | ZHANG Di | School of Geographic and Environmental Sciences, Guizhou Normal University, Guiyang 550001, China | | | ZHOU Ming-zhong | School of Geographic and Environmental Sciences, Guizhou Normal University, Guiyang 550001, China | mingzhongzhou@126.com | | XIONG Kang-ning | Research Institute of Karst, Guizhou Normal University, Guiyang 550001, China | | | GU Bing-qian | School of Geographic and Environmental Sciences, Guizhou Normal University, Guiyang 550001, China | | | YANG Hua | School of Geographic and Environmental Sciences, Guizhou Normal University, Guiyang 550001, China | |
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| Abstract: |
| To understand the contamination degree of nickel (Ni)in soils around the Ni-molybdenum (Mo)polymetallic mining areas in Songlin, Zunyi, China and human health risk of this heavy metal in crops planted on these soils, the content of Ni in 51 soil and crop samples was analyzed. Furthermore, the pollution degree of Ni in the soils and human health risk of Ni in the crops were assessed using the geoaccumulation index and hazard quotient, respectively. Firstly, the results of the present study show that the soils have high Ni content with an average of 157.1 mg·kg-1 in the upland soil and 197.0 mg·kg-1 in paddy soil, which are significantly higher than that (33.0 mg·kg-1)in the reference soil sample. The results also reveal that the concentration of Ni in the crops (Chinese cabbage, radish, sweet potato, rice, pepper, and maize)ranges from 0.36 mg·kg-1 to 59.97 mg·kg-1. Except corn, the average content of Ni in individual crops exceeds the Ni standard limit (grain:0.40 mg·kg-1, garden stuff:0.30 mg·kg-1)reported in the Manual of the Standards for the Physical and Chemical Inspection of Food Hygiene. Further, the analysis of geoaccumulation index indicates that the upland and paddy soils might be polluted by Ni (most of the soil samples present an evaluation degree of mild to moderate pollution, and some with heavy pollution). Simultaneously, the analysis of human health risk index suggests that the intake of Ni from each crop is lower than the exposure reference measurement and that the corresponding health risk index is <1, indicating that the risk of Ni caused by individual crop for adults and children is less. However, when all the six crops were included, the Ni health risk index for adults and children is >1, suggesting that the health risk of Ni to human might be caused by long-term regular consumption of these crops. |
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