滨海地区土壤重金属Cr,Cu,Pb和Zn的状况

Status of heavy metal Cr,Cu,Pb and Zn in soil of coastal area

为研究上海市临港新城土壤生态,从临港新城主城区及周边地区31处采集土壤,测定土壤中Cr,Cu,Pb和Zn等4种重金属元素的地理分布特征,并利用单项污染指数和内梅罗污染指数评价4种金属的污染程度.研究结果表明:表层土壤中4种金属元素含量由沿海至内陆呈先增加后降低的趋势;而深层土壤中Cr和Pb含量由沿海至内陆呈增加的趋势,Cu和Zn含量由沿海至内陆呈先增加后降低的趋势;总体上沿海的土壤样品中Cr,Cu,Pb和Zn含量比研究范围内其他地区土样中的含量略低.按土壤一级标准,该地区属轻度污染;按土壤二级标准,除深层土壤中有3.23%土壤样本的Cu含量超标外,其余土壤重金属含量均未超标,符合农业生产中维护人体健康的标准.

In order to study the soil ecology of Shanghai Lingang New City, the soil in 31 places of the urban area and edge area of Lingang New City is collected to determine the geographic distribution fea- tures of four heavy metals including Cr, Cu, Pb and Zn, and the single item pollution index and Nemero pollution index are used to evaluate the pollution degree of the four heavy metals. The result of investigation demonstrates： contents of the four metals in surface soil show the tendency of increasing firstly and decreasing subsequently from coast to inland; the contents of Cr and Zn in deep soil exhibit the tendency of increasing from coast to inland, while the contents of Cu and Pb show the tendency of increasing firstly and decreasing subsequently from coast to inland; the overall Cr, Cu, Pb and Zn content in the soil of coastal places is less than that in other places of Shanghai Lingang N standard of the soil environment quality, the soil in this area is slightl ew City. According to the primary y contaminated. However, accord- ing to the secondary standard of the soil environment quality, except the content of Cu in 3.23% of deep soil samples exceeded the limited value, contents of other heavy metals are within the limited value, which complies with the standard for protecting human health in agricultural production.