地积累指数法及生态危害指数评价法在土壤重金属污染中的应用及探讨

Application of the Index of Geo-accumulation Index and Ecological Risk Index to Assess Heavy Metal Pollution in Soils

将近年常用于重金属污染的地积累指数法及生态危害指数评价法进行了对比分析,并对西南某铅锌矿矿区表层土壤中重金属(Zn、Pb、Cd、Cu)污染情况进行了评价。结果表明,该区Cd为极严重污染,Pb为中等污染,Zn和Cu为轻微污染。地积累指数评价法和生态危害指数评价法两者各有侧重点,对于重金属污染的系统评价各具合理性;但两种方法都是基于沉积学理论提出,在对土壤重金属污染进行评价时,有其局限性,建议在对其参数修正后综合应用。

Igeo （mUller index of geo - accumulation） and Hakanson ecological risk index, two widely used methods on metal pollution assessment are analysed. An assessment was presented using Igeo and ecological risk index to evaluate the heavy metals （ Pb, Zn, Cu, Cd） pollution in soil of a certain factory smelting Pb and Zn in southwest China. The result shows that the main heavy metal pollutions are cadmium and lead, the copper and zinc pollutions are light. Although the two indexes emphasize on different aspects, they are reasonable in systemic assessment of heavy metals. Both based on sedimentary theory, they are suggested to be used together after relevant parameter being modified, when assessing heavy metal pollution in soil.