南京市江宁区某街道农庄土壤重金属含量分析与风险评价

Content Analysis and Risk Assessment of Heavy Metals in Soil of a Street Farm in Jiangning District,Nanjing

本研究测定了南京市江宁区某街道的6家家庭农庄土壤和蔬菜可食部分的Cu、Zn、Hg、As、Cd、Ni、Pb等重金属含量,采用单因子指数评价法和内梅罗综合指数评价法对其重金属含量进行评价.结果表明,Cd元素的土壤单因子评价结果为轻微污染,Cu、Zn、Hg、As、Cr、Ni、Pb元素均在正常范围内,从内梅罗综合污染指数评价来看,有12.5%的土壤属于轻度污染,87.5%的土壤未受到重金属污染,土壤的综合评价属于清洁水平;蔬菜中所测元素Cr、Ni、As、Cd、Hg、Pb的单因子指数评价结果皆在正常范围内,内梅罗综合污染评价指数的最大值皆小于0.7,说明全部蔬菜样品均未受到重金属的污染.

In this study,the contents of Cu,Zn,Hg,as,CD,Ni,Pb and other heavy metals of the edible parts in soils and vegetables of six family farms in a street of Jiangning District,Nanjing were determined.The heavy metal status was evaluated by single factor index evaluation method and Nerome comprehensive index evaluation method.The results showed that the soil single factor evaluation result of Cd element was slight pollution,and Cu,Zn,Hg,As,Cr,Ni,and Pb elements were within the normal range.Through Nemerow pollution index analysis,12.5%of the soil belonged to mild pollution,87.5%of the soil was not contaminated by heavy metals,and the comprehensive evaluation of the soil belonged to the clean level.The results of single factor index evaluation of Cr,Ni,As,Cd,Hg and Pb in vegetables were within the normal range,and the maximum value of comprehensive pollution evaluation index of Nemerow was less than 0.7,indicating that all vegetable samples were not contaminated with heavy metals.