典型砒霜厂污染场地重金属污染特征及环境风险评价

摘要

以某个砒霜厂旧址为研究对象,分析场地的重金属污染特征.结果表明,该场地受到砷、铜、铅、镉和锌等重金属污染,其中,砷污染指标超过评价标准值达7 199倍;基于《展览会用地土壤环境质量评价标准(暂行)》条件下,采用RBCA模型计算砷、镉、铜、锌对人体健康的环境风险,结果表明,该场地砷超过了致癌风险指数标准限值(10-6)及非致癌危害商标准限值(1),说明砷具有很大的环境风险;采用IEUBK模型计算铅对人体的健康风险,结果表明,铅也具有一定的环境风险.因此,该污染场地在开发利用过程中需要对环境风险区域进行治理修复后才能使用.%In this study,a contaminated site of one arsenic plant was taken as an example to analyze the pollution characteristics of heavy metals in the site.The results showed that the site was polluted by heavy metals such as arsenic,copper,lead,cadmium and zinc,with the concentration of arsenic exceeding 7199 times over the standard value.According to the Standard of Soil Quality Assessment for Exhibition Sites,RBCA model was adopted to calculate the environmental risks of arsenic,cadmium,copper and zinc towards human health.It was found that the environmental risk value of arsenic exceeded the carcinogenic threshold limit (10-6) and non-carcinogenic risk limit (1),indicating that there existed high environmental risk of arsenic.IEUBK model was used to calculate the environmental risks of lead towards human health,with the results of a certain environmental risk of lead.Therefore,during the reclamation process of such contaminated site,remediation should be carried out before reuse.