桂林市菜地土壤重金属含量及其风险评价

Heavy metal content and their risk evaluation in vegetable field soil of Guilin City

以产地土壤重金属的含量为依据,应用单因子污染指数法和尼梅罗综合污染指数法及潜在生态危害系数法对桂林市菜地土壤重金属进行污染和风险评价。结果表明:桂林市菜地土壤中铅(Pb)、铬(Cr)、铜(Cu)、锌(Zn)、镉(Cd)、镍(Ni)、砷(As)、汞(Hg)8项重金属的平均含量有铬(Cr)、铜(Cu)、锌(Zn)、镍(Ni)、砷(As)、汞(Hg)6项低于背景值,只有铅(Pb)和镉(Cd)略高于背景值;菜地土壤中铅(Pb)、铬(Cr)、铜(Cu)、锌(Zn)4项重金属属于低度生态危害,镉(Cd)属于中等生态危害;菜地土壤环境质量处于警戒限,尚清洁。

Based on the soil heavy metal content,single-factor pollution index,Nemerow integrated pollution index and potential ecological-endangerment coefficient are used to evaluate the pollution and risk of heavy metal in vegetable field soil of Guilin City.The results show that among 8 heavy metals（Pb,Cr,Cu,Zn,Cd,Ni,As,Hg）,the average contents of Cr,Cu,Zn,Ni,As,Hg are lower than background values,only the average contents of Pb and Cd are slightly higher than background values.Pb,Cr,Cu,Zn are low eco-endangerment,Cd is middle ecological-endangerment.The soil environment quality of vegetable field is still clean but located at the alertness line.