潼关金矿区农田土壤铅污染生态风险研究

Ecological Risk Study of Soil Lead Contamination in Tongguan Gold Areas

土壤铅污染的潜在生态风险程度是土壤污染防治的前提和基础,为揭示土壤铅的潜在生态风险程度,在前期土壤污染调查评价的基础上,采用Hakanson的潜在生态危害指数法,以华阴市孟塬乡无工矿影响区的农田土壤中铅含量均值作为参比值,对矿区土壤进行了铅污染评价及潜在生态环境危害评估。结果表明:铅污染程度严重,研究区内铅污染风险总体较轻,轻度风险占样品总数的82.71%,中等占11.28%,强的占2.26%,很强占1.50%,极强占2.26%。但由于土壤中铅含量的平均值远大于中值,表明局部污染非常严重,应对高风险区进行合理治理和修复。

The degree of potential ecological risk of soil lead contamination is the premise and foundation of soil pollution prevention and control.Based on the pre-investigation and evaluation of soil lead contamination,potential ecological risk index method（Hakanson） are adopted to assess soil quality and reveal its potential ecological risk degree.With the mean value of soil lead in non-mining area of Mengyuan town of Huayin city as reference values,the soil lead contamination assessment and potential ecological risk in mining area are carried out.The results indicate that the lead contamination in the study area is heavy.The overall lead contamination risk in study area is relative low,with 82.71% samples in low risk,11.28% in moderate risk,2.26% in high risk,1.50% in higher risk and 2.26% in extreme high risk.However,the average of lead content is much higher than the median of lead,which indicates that the local contamination is heavy.So the reasonable cure and rehabilitations to the local high risk areas are needed.