韶关某冶炼厂周边土壤重金属污染调查与生态风险评价

Investigation of Soil Pollution from Heavy Metals and Assessment of Its Ecological Risk around a Smelting Plant in Shaoguan

[目的]研究韶关某冶炼厂周边土壤重金属的污染特征和分布规律,并进行生态风险评价,以期为该地区土壤重金属污染治理及生态恢复提供参考。[方法]以韶关某冶炼厂周边土壤为研究对象,运用内梅罗污染指数法和地累积指数法对冶炼厂周边土壤的重金属污染特征和潜在生态风险进行研究。[结果]Pb、Cr、Cd、As 4种重金属的平均含量均超过我国土壤环境背景值和广东省土壤环境背景值,其中,Cd、As超过国家土壤环境二级标准值。Cd为重污染,pb、As为中污染,但局部存在重污染,Cr为轻污染。[结论]该冶炼厂周边土壤存在不同程度的重金属污染,生态风险总体水平初步评价为中等以上。

[Objective] The characteristics and distribution of soil pollution from heavy metals around a smelting plant in Shaoguan were studied,and its ecological risk was assessed to provide theoretical references for the control and ecological restoration of soil pollution from heavy metals in the region.[Method] Soil samples were collected and analyzed from the smelting plant area,and the characteristics of soil pollution from heavy metals and potential ecological risk were studied by using the methods of Nemerow contamination index and geo- accumulation index. [Result]Average contents of Pb,Cr,Cd and As in the soil were higher than the background values of soil in Guangdong Province and China,and the contents of Cd and As exceeded the secondary standard of soil environment in China. Cd pollution was heavy,and Pb and As pollution were moderate,but the pollution was heavy in some areas; Cr pollution was mild.[Conclusion]Soil around the smelting plant has been polluted by heavy metals at different levels,and its potential ecological risk is moderate at least.