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| Soil cadmium pollution and crop health risk in a mining area in south China |
| Received:April 28, 2020 |
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| KeyWord:mining area;cadmium;rice;dietary exposure;planting structure |
| Author Name | Affiliation | E-mail | | ZHANG Yan | School of Environment, Beijing Normal University, Beijing 100875, China | | | ZHANG Lei | Marine Information Center, Cnooc Information Technology Co., LTD., Beijing 100027, China | | | CHENG Hong-guang | School of Environment, Beijing Normal University, Beijing 100875, China | chg@bnu.edu.cn | | SUN Hai-xu | School of Environment, Beijing Normal University, Beijing 100875, China | | | CUI Xiang-fen | School of Environment, Beijing Normal University, Beijing 100875, China | |
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| Abstract: |
| A county in southern China is rich in mineral resources and suffers from serious soil cadmium pollution. To assess local soil cadmium pollution and the health risks of different populations and quantify the cadmium content of different local crops, a total of 135 soil samples were collected from three towns in the county; 128 rice samples were obtained from households, and seven navel orange samples were acquired from planting areas. The results revealed that the excess cadmium rates of the soil samples were 41.67%, 28.81%, and 21.62%, respectively. According to a geo-accumulation index, 68.9% of the soil samples in the county were polluted with cadmium to different degrees. The excess cadmium contents of the rice samples ranged from 8.82% to 48.57% among locations. The navel orange pulp cadmium content was <0.05 mg·kg-1. The hazard quotient value of consuming home-grown rice was generally >1, which constitutes a high risk, whereas the health risk of consuming navel orange pulp was low. Orange planting has certain economic benefits, and navel orange is suitable for cultivation under local conditions. Therefore, it is recommended that local residents of heavily polluted areas buy commercially sold rice and farm navel orange instead of rice. |
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