钼矿区污灌菜地土壤重金属污染的生态风险预警评价

通过对钼矿区地下水进行重金属含量分析，发现地下水已受重金属污染。该受污染地下水为矿区菜地唯一灌溉用水。本文研究钼矿区污灌菜地土壤的重金属污染现状及生态风险。选取矿区、尾矿区、选矿区周边菜地的土壤样本60个，用HNO3-HF-HClO4处理后，采用等离子体发射光谱仪（ICP-AKS）测定土壤样品中Pb、As、Hg、Cr、Cd、Zn、Cu、Ni的全量，采用生态风险指数进行生态风险预警评价。结果表明：矿区、尾矿区、选矿区周边受污染菜地尾矿区农田土壤的生态风险指数（IER）分别为59．42、80．60、154．83，其预警类型均为重警；污染程度为矿区菜地〈尾矿区菜地〈选矿区菜地。

Ecological Risk Warning Assessment of the Soil Polluted by Heavy Metals in the Vegetable Land Irrigated with Wastewater around the Areas of Molybdenum Ore

The underground water has been polluted by heavy metals according to the test of water quality of molybdenum ore areas.This paper studied the vegetable soils'current situation around the molybdenum ore and carried out ecological risk warning assessment.60 soil samples of ore areas,tailings areas and collection areas having been polluted of molybdenum ore were chosen.The samples were used HNO3-HF-HClO4 to digest,the contents of Pb,As,Hg,Cr,Cd,Zn,Cu,Ni were analyzed by ICP-AES and carried out ecological risk warning assessment.The ecological risk warning assessment indexes(IER) of ore areas,tailings areas and collection areas were 59.42,80.60 and 154.83,the assessment of soils were heavy warning situation,the polluted degree was ore areas