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| Characteristics and health risk assessment of heavy metal pollution in farmland soil and crops in Qinling mining area，Shaanxi Province |
| Received:July 03, 2024 |
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| KeyWord:Qinling mining area;heavy metal pollution;farmland soil;crops;health risk assessment |
| Author Name | Affiliation | E-mail | | NIU Haoze | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | | | ZHANG Chao | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | | | HE Feng | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | | | WANG Ziyu | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | | | YUAN Mengyao | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | | | LAIPAN Minwang | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | | | GUO Junkang | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China | junkangguo@sust.edu.cn |
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| Abstract: |
| To investigate the characteristics and health risks of heavy metal pollution in farmland soil and crops in different mining areas of Qinling Mountains, Shaanxi Province, 10 mining areas were selected from the Shaanxi section to the east of Qinling Mountains. The contents of As, Cd, Cr, Cu, Pb, and Zn in 214 surface soil samples（0-20 cm）, 160 corn and 160 Chinese cabbage samples were collected and measured. The characteristics of heavy metal pollution in farmland soil and mining areas in the study area were evaluated using single factor, comprehensive pollution, land accumulation index method, and potential ecological risk index method. Pearson correlation analysis and principal component analysis methods were used to preliminarily explore the sources of heavy metals in farmland soil in the study area. The health risk assessment model developed by the United States Environmental Protection Agency（USEPA）was used to evaluate the health risks of farmland soil and crops in the study area. The results showed that heavy metal pollution was widespread in the farmland soil around the Qinling mining area in Shaanxi Province. The average contents of Cd, Cr, Cu, Pb, and Zn in the soil of the study area were 11.03, 1.49, 1.82, 5.52 times, and 1.27 times the background values of soil in Shaanxi Province, respectively. The contents of Cr, As, Cd, and Pb in both crops exceeded the threshold of the National Standard for Food Safety-Limits of Pollutants in Food（GB 2762—2022）. The proportion of points with Cd reaching the level of heavy pollution or above in the soil was 13.60%, the average value of the potential ecological risk index of heavy metals in the soil was 162.31, and the proportion of points with high risk or above potential ecological risk level was 35.38%; Correlation analysis indicates that these heavy metals may have common sources of pollution, while principal component analysis suggests that mineral mining activities are the main source of heavy metal pollution in farmland soils in the study area; Heavy metals in farmland soil pose non carcinogenic and carcinogenic risks to both children and adults, while crops may pose carcinogenic hazards to populations. Among them, Cr, As, Pb, and Cd in crops are the main risk elements. In summary, it was found that the research site is severely affected by mining activities, resulting in severe soil heavy metal pollution. The heavy metal content in crops exceeds the standard, posing significant ecological and health risks. Therefore, it is necessary to strengthen the monitoring of heavy metals. |
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