Huang Jian-Bo, Jiang Deng-Deng, Wen Bing, Wang Lei, Shi Jia-Qi, Zhou Yan
Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China.
State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China.
Huan Jing Ke Xue. 2023 Apr 8;44(4):2204-2214. doi: 10.13227/j.hjkx.202205055.
In order to identify the contamination and health risks of heavy metals in agricultural soils, a total of 56 surface soil samples (0-20 cm) were collected around a Pb-Zn smelter in Yunnan Province, and six heavy metals (Pb, Cd, Zn, As, Cu, and Hg) and pH were analyzed to assess heavy metal status, ecological risk, and probabilistic health risk. The results revealed that the average contents of six heavy metals (Pb:4413.93 mg·kg, Cd:6.89 mg·kg, Zn:1672.76 mg·kg, As:44.45 mg·kg, Cu:47.61 mg·kg, and Hg:0.21 mg·kg) were higher than their background values in Yunnan Province. Cd had the highest mean geo-accumulation index () of 0.24, the highest mean pollution index () of 30.42, and the greatest average ecological risk index () of 1312.60, indicating that Cd was the primary enriched and highest-ecological risk pollutant. The mean hazard index (HI) through exposure to six HMs was 2.42E-01 and 9.36E-01 for adults and children, respectively, with 36.63% of HI values for children exceeding the risk threshold of 1. Moreover, the mean total cancer risks (TCR) were 6.98E-05 and 5.93E-04 for adults and children, respectively, with 86.85% of TCR values for children exceeding the guideline value of 1E-04. The probabilistic health risk assessment suggested that Cd and As were the main contributors for the non-carcinogenic risks and carcinogenic risks. This work will provide scientific reference for the precise risk management and effective remediation strategy of soil heavy metal pollution in this study area.
为了识别农业土壤中重金属的污染情况和健康风险，在云南省某铅锌冶炼厂周边共采集了56个表层土壤样本（0 - 20厘米），并对六种重金属（铅、镉、锌、砷、铜和汞）以及pH值进行了分析，以评估重金属状况、生态风险和概率性健康风险。结果表明，六种重金属的平均含量（铅：4413.93毫克·千克，镉：6.89毫克·千克，锌：1672.76毫克·千克，砷：44.45毫克·千克，铜：47.61毫克·千克，汞：0.21毫克·千克）高于云南省的背景值。镉的平均地累积指数（）最高，为0.24，平均污染指数（）最高，为30.42，平均生态风险指数（）最大，为1312.60，表明镉是主要富集且生态风险最高的污染物。成年人和儿童通过接触六种重金属的平均危害指数（HI）分别为2.42E - 01和9.36E - 01，儿童HI值中有36.63%超过了风险阈值1。此外，成年人和儿童的平均总癌症风险（TCR）分别为6.98E - 05和5.93E - 04，儿童TCR值中有86.85%超过了指导值1E - 04。概率性健康风险评估表明，镉和砷是致癌风险和非致癌风险的主要贡献因素。这项工作将为该研究区域土壤重金属污染的精准风险管理和有效修复策略提供科学参考。
