基于地球化学基线的土壤重金属污染风险评价

在实地采样分析的基础上,采用标准化方法确定浑河冲洪积平原表层土壤中Cu、Pb、Zn、Ni、Cr、As、Cd这七种重金属的地球化学基线,分别以土壤环境背景值和地球化学基线为参比值,结合müller地积累指数法和Hkanson潜在生态风险指数法对污染现状和潜在生态风险进行评价。结果表明:其中Pb和As污染较为严重,七种重金属均具有不同程度的潜在生态风险,Cd是具有相对较高潜在生态风险的污染因子,45%采样点土壤多种重金属的潜在生态风险达到中等。

Pollution Risk Assessment of Heavy Metals in Soil Based on Geochemical Baseline

Baselines of seven heavy metal elements in the topsoil of the Hun River alluvial fan such as Cu, Pb, Zn, Ni, Cr, As and Cd were calculated by normalization approach, based on the samples which were collected and analyzed. Taking the baseline and environmental background values as the contrast parameters, the Müller land accumulation index, Häkanson potential ecological risk index methods were applied to assessing the ecological risk. The obtained results showed that As and Cd contents exceeded the national standard; these 7 heavy metals possessed different potential ecological risks; Cd is the main pollution factor which appears to have relatively high risk, 45% of the samples appear to have middle potential ecological risks of multiple heavy metals.