乔口镇土壤重金属Pb、Cd潜在生态风险评价

Potential Ecological Risk Assessment of Heavy Metals Pb and Cd in Soil of Qiaokou Town

以长沙市望城区乔口镇周边农田土壤为研究对象,利用单因子评价法和潜在生态危害指数法对其土壤中Pb、Cd的含量进行生态风险评价。研究结果表明,乔口镇研究区域重金属Pb污染在可接受范围之内,而土壤中重金属Cd的累积程度较高,污染严重,已经对区域内的生态环境产生危害。同时,对周边农田土壤重金属的潜在生态风险研究发现,土壤重金属Cd的单因子潜在生态危害指数Ei处于40~160之间,且深度为0~20 cm的土样中Cd的单因子潜在生态危害指数均大于80,表明该元素存在强生态危险。从综合潜在生态风险危害指数RI来看,乔口镇综合潜在生态风险危害还在可接受范围之内。

With Qiaokou Town soil of Wangcheng district in Changsha City as research object, applies the single factor evaluation method and Hakansan＇s potential risk index to conduct the ecology risk assessment of heavy metals Pb and Cd in soil. The results show that the pollution degree of Pb to the soil in the studied area of Qiaokou Town is within the acceptable range, while the accumulation of heavy metal Cd of soil was relatively high, and the pollution is serious. The study of potential ecological risk shows that the single factor index Ei of Cd in soil is between 40～160, and Cd in the 0～20 cm soil sample is greater than 80, indicating that the element is a strong ecological danger. From the comprehensive potential ecological risk index RI, the comprehensive risk in Qiaokou Town is within an acceptable range.