宿州市城区环城河两侧土壤重金属含量及空间分布特征

Heavy Metal Content and Spatial Distribution of Soil on Both Sides of Ring River in Suzhou City

以宿州市环城河两侧土壤为研究对象,考虑到环城河两侧环境的不同,在河流两岸各布置18个采样点,共36个采样点,分析Cu、Pb、Zn、Cd、Ni、Cr、Hg、As共8种重金属元素的含量及空间分布特征。结果表明:Cu、Pb、Zn、Cd、Ni、Cr、Hg、As平均含量分别为34.27、27.32、66.07、5.73、30.18、51.99、0.34、16.81mg/kg,其中Cd和Hg超出国家土壤环境质量一级标准,Cu超过了宿州土壤背景值,除Zn外,其余元素均超过安徽省土壤背景值;从河流沿岸土壤重金属含量空间分布特征来看,Cu、Cd、Ni、Cr、Hg这5种重金属元素含量为北侧高、南侧低,Pb、Zn、As这3种重金属元素含量则为北侧低、南侧高,表明重金属含量分布与环境绿化间存在一定关联。

In order to grasp the content and spatial distribution characteristics of heavy metals in the soil on both sides of the urban river,18 sampling points were set up on both sides of the river,and 36 sampling points in total,considering the different environments on both sides of the river.The average contents of Cu,Pb,Zn,Cd,Ni,Cr,Hg and As were 34.27,27.32,66.07,5.73,30.18,51.99,0.34,16.81mg/kg,Respectively,the average contents of Cd and Hg of 8 heavy metals exceeded the national first-level standard of soil environmental quality,Cu exceeded the soil background value in Suzhou,and all the other elements exceeded the soil background value in Anhui Province ex⁃cept Zn.According to the spatial distribution characteristics of heavy metal contents in the soil along the river,Cu,Cd,Ni,Cr and Hg contents were high in the north and low in the south.The contents of Pb,Zn and As were low in the north and high in the south.There was a certain relationship between the distribution of heavy metal content and the environmental greening.