河池某污染场地重金属污染特征与生态风险评价

Heavy Metal Pollution Characteristics and Ecological Risk Assessment of a Polluted Site in Hechi

以河池某公司疑似污染场地为调查对象,依据场地环境调查技术导则(HJ 25.1-2014)等有关国家环境保护标准,分析该场地不同区域土壤和地下水典型污染物的污染特征。结果表明,场地内土壤均未受到重金属元素砷、镉、铜、铅、镍的污染,其潜在生态风险级别为轻微。场地内地下水存在镉、铜、锌、镍、锰和硫酸根超标现象。场地内地下水重金属污染可能是场地内黑色炭质泥岩中的黄铁矿氧化导致土壤和水体酸化,黑色炭质泥岩中的重金属在酸性条件下经雨水冲刷、淋滤作用下渗水迁移导致,具体情况还须对场地内岩石进行重金属污染调查。

The suspected contaminated site of a Hechi company was taken as the investigation object,and the monitoring data of typical soil and groundwater pollutants in different areas of the site were analyzed based on the technical guidelines for site environmental investigation(HJ 25.1-2014) and other relevant national environmental protection standards.The results showed that cadmium,copper,zinc,nickel,manganese and sulfate exceeded the standards in different degrees in the inland water of the site.The soil in the site is not polluted by heavy metal elements arsenic,cadmium,copper,lead and nickel,and its potential ecological risk level is slight.The heavy metal pollution of groundwater in the site may be caused by the acidification of soil and water bodies caused by pyrite in the black carbonaceous mudstone in the site,which causes the heavy metals in the black carbonaceous mudstone to seep and migrate under acidic conditions by rain erosion and leaching.It is also necessary to investigate and evaluate the heavy metal pollution of the rocks in the site.