西安市区表层土壤重金属风险评价

Risk Assessment of Heavy Metals in Urban Topsoil in Xi'an

在对西安市二环内表层土壤样品重金属含量测定的基础上,评价了城市土壤中Co、Cr、Cu、Mn、Zn、Ni、Pb、V的潜在生态风险及健康风险。研究结果表明,西安二环内8种重金属元素的潜在生态风险为中度,不同采样点土壤重金属潜在生态风险不同,78个表层土壤采样点中,25个采样点为轻微潜在生态风险,49个采样点为中等潜在生态风险,3个采样点为较高潜在生态风险,1个采样点为高潜在生态风险。Co、Cr、Cu、Mn、Ni、Pb、Zn、V对于成人和儿童的非致癌性风险值均小于1,表明未对人体健康造成危害;Co、Cr、Ni的致癌性风险值也在安全范围之内,未对人体健康造成威胁。

There were 78 soil samples collected from the interior area of the Second Ringroad,Xi＇an.The potential ecological environment hazard and human risk of the heavy metals Co,Cr,Cu,Mn,Zn,Ni,Pb and V were evaluated to provide a reference for the urban environmental management.The results of the study showed that the potential ecological risk of the heavy metals in the urban topsoil collected from the interior area of the Second Ringroad,Xi＇an was moderate.And the potential risks of the samples were different in different collect spots.The potential ecological risk of 25 samples was slight,that of 49 samples was moderate,that of 3 samples was higher,and that of 1 was the highest within the 78 soil samples.For adults and children,the health risk index for non-carcinogenicity of Co,Cr,Cu,Mn,Zn,Ni,Pb,V was all less than 1,which indicated there was not human health hazard.The carcinogenicity risk values of Co,Cr,Ni were in scope,which stated that there was no security threat on human health.