某工业场地砷污染特征及风险评估

Arsenic Pollution Characteristics and Risk Assessment of an Industrial Site

对某硫铁矿制硫酸工业场地土壤和地下水中砷的空间分布和污染现状进行了分析。结果表明:场地内土壤砷的最大超标倍数为25.5倍,土壤砷超标主要集中分布在硫酸车间、硫铁矿仓库和渣场,砷浓度总体上随深度的增加呈现下降趋势;场地内地下水砷的最大超标倍数为27.1倍,空间上地下水砷高值区分布与土壤砷的高值区分布高度吻合;根据风险评估结果,土壤砷致癌风险和非致癌风险均超过可接受风险水平。

The spatial distribution and current pollution situation of arsenic in the soil and groundwater of a pyritic sulfuric acid industrial site were analyzed.The results reveal that:the maximum over-standard multiple of the content of arsenic in the soil at the industrial site is 25.5 times,and the arsenic in the soil is intensively distributed in sulfuric acid workshops,pyritic warehouses and slag disposal pits.The concentration of arsenic generally shows a downtrend with the increase of depth.The maximum over-standard multiple of the content of arsenic in groundwater at the site is 27.1 times.Spatially,the high-value distribution of arsenic in groundwater is highly consistent with that in the soil.The results of the risk assessment indicate that both the carcinogenic and non-carcinogenic risks of arsenic in the soil have exceeded the acceptable risk level.