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| Temporal and spatial characteristics and health risk assessments of heavy metal pollution in soils of Shenfu irrigation area |
| Received:June 11, 2015 |
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| KeyWord:Shenfu sewage irrigation area;soil heavy metal;spatial and temporal distribution;health risk |
| Author Name | Affiliation | E-mail | | AN Jing | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | GONG Xiao-shuang | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
College of Resource and Environment, University of Chinese Academy of Sciences, Beijing 100049, China | | | CHEN Hong-wei | School of Life Science and Engineering, Shenyang University, Shenyang 110044, China | chwssss@163.com | | WEI Shu-he | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | |
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| Abstract: |
| Shenfu irrigation area, a typical sewage irrigation area in Northeast China, was selected to study temporal and spatial characteristics of heavy metal(Cd, Pb, Cu, and Zn) pollution in soils and crops. Potential health risks of heavy metals in crops were also assessed. A total of 28 soil samples were collected along the main irrigation ditches according to village boundaries. Mathematical statistic method and spatial interpolation technology were used to study the spatial characteristics of heavy metals in the soils and crops. Nemero pollution index and EPA human exposure potential health risk and potential ecological risk index were used to evaluate the potential health risks of heavy metals in soils and agricultural products. Results showed that the mean concentrations of Cd, Pb, Cu, and Zn in the soil samples were 0.60, 38.76, 22.39 mg·kg-1, and 57.64 mg·kg-1, respectively. The concentrations of Cd exceeded the secondary grade of national soil environmental quality standard. Compared with the heavy metal concentrations in previous studies, the concentrations of Cu and Zn decreased significantly, while those of Cd and Pb had no significant changes. The spatial distribution characteristics of the heavy metals were different among Cu, Zn, Cd, and Pb. The soils in the Shenfu irrigation area was slightly polluted by heavy metals. The concentrations of Cd and Pb in corns exceeded the limits of the national food safety, indicating heavy metal risks to the human's health, especially Cd. |
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