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| Spatial distribution pattern and sources of metal pollutants in farmland soils near a phosphorus chemical industrial zone |
| Received:December 05, 2022 |
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| KeyWord:soil;heavy metal;form;PMF model;source apportionment;spatial variation |
| Author Name | Affiliation | E-mail | | YANG Guang | Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610299, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | TANG Xiangyu | Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610299, China
State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China | xytang@imde.ac.cn | | GUAN Zhuo | Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610299, China | | | CUI Junfang | Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610299, China | | | CHENG Jianhua | State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China | |
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| Abstract: |
| Identifying spatial distribution characteristics, ecological risks, and pollutant sources in farmland soils near a phosphorus chemical industrial zone is critical to pollution control and the safe utilization of contaminated farmland. Soil samples were obtained from the downwind farmland of the phosphorus chemical industrial zone and evaluated for metal pollutant concentration and major pollutant speciation. The degree of pollution in soil samples was evaluated using a pollution index and a potential ecological risk index. Source apportionment of pollutants in soil samples was performed by positive matrix factorization(PMF). The results revealed that the primary heavy metal pollutants in farmland soils were Cd and Zn, where Cd was the pollutant that seriously exceeded the standard. The closer the soil sampling site was to the phosphorus chemical industrial zone, the greater the soil Cd contamination. The content of exchangeable Cd declined rapidly as one moved away from the phosphorus chemical industrial zone, but residual Cd rose generally. The amounts of soil Cd contamination and ecological risk at sampling points within 500 m of the phosphorus chemical industrial zone were relatively high. Industrial pollution sources contributed 56.2% of Cd, with the highest soil contamination level, whereas atmospheric deposition and exhaust emission sources contributed 43.8%. Soil pollution in this study area was closely related to the phosphorus chemical industry. Therefore, it is necessary to strengthen industrial pollution source control and comprehensive environmental management to ensure the safety of agricultural production. |
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