砷品厂遗留场地土壤重金属污染分析与风险评估

Soil pollution characteristics and ecological risk assessment of of heavy metal pollution in soil of remaining site of arsenic factory

以某砷品化工厂遗留污染场地为研究对象,对污染场地进行采样,并对重金属污染物进行分析和风险评估。研究结果表明,该废弃砷品厂主要超标重金属污染物有砷、镉、铬,浓度分别26.2-332、0.16-36.3和134-690 mg/kg,其超标率分别为100%、100%和49%;场地砷的致癌风险值为2.72×10-4、超可接受的阈值10-6,危害熵为16.7,大于阈值1,对人体存在较严重的致癌和非致癌危害风险,而镉、铬均未超过阈值,该场地需进行修复后方可进行开发利用。

Studing the contaminated sites left over from an arsenic chemical plant as the research object,the contaminated sites were sampled,and the heavy metal contaminants were analyzed and risk assessed.The results show that the main heavy metal pollutants in the waste arsenic plant are arsenic,cadmium and chromium,with concentrations of 26.2-332,0.16-36.3 and 134-690 mg/kg,respectively,and the rates of exceeding the standard are 100%,100% and 49%.The carcinogenic risk of arsenic in the site is 2.72×10^-4,the acceptable threshold is 10-6,and the hazard entropy is 16.7,which is greater than the threshold 1.There is a serious risk of carcinogenic and non-carcinogenic hazards,but cadmium and chromium do not exceed the threshold value.The site needs to be repaired before it can be exploited and utilized.