徐州城市表层土壤中重金属富集特征与风险评价

研究了徐州城市表层土壤的21个样品中28种金属元素的富集特征。结果表明,与我国土壤元素的背景值(算术平均值)相比,表层土壤中Zn,Cd,As,Hg,Sb,Sn,Ag等元素富集程度大;Fe,Se,Sc,Ba,Bi,Pb,Cu,Ni,Cr,Mn,Mo,Be,Ti,Al,Ga,Li,Co等元素的富集较小。环境风险指数的计算结果表明,徐州城市表层土壤样品中属于中等环境风险级别以上的样品占近40%。

Accumulation Characteristics and Environmental Risk Assessment of Heavy Metals in Xuzhou Urban Topsoil

Twenty-one samples of urban topsoil in Xuzhou were taken to analyze the concentrations of twenty-eight metal elements(Zn,Cd,As,Hg,Sb,Sn,Ag,Fe,Se,Sc,Ba,Bi,Pb,Cu,Ni,Cr,Mn,Mo,Be,Ti,Al,Ga,Li,Co,etc.). Compared to the arithmetic means of natural soils of China,Zn,Cd,As,Hg,Sb, Sn and Ag have higher accumulation in the urban topsoil of Xuzhou than that of the others(such as Fe,Se,Sc,Ba,Bi,Pb,Cu,Ni,Cr,Mn,Mo,Be,Ti,Al,Ga,Li,Co).Environmental risk indexes indicate that 40% of the samples are above the grade of medium environmental risk in the topsoil.