徐州市三环南路土壤重金属污染特征

以徐州市三环南路两侧土壤为研究对象,对土壤中重金属含量（Cu、Cr和Pb）进行了测定.根据测定结果对公路两侧土壤中重金属的污染特征和分布规律进行了研究.结果表明：（1）公路两侧土壤中重金属含量随距路基距离的远近而不同,重金属含量在距路基10～30m的范围内出现峰值,随后含量逐渐降低,并且土壤重金属含量主要累积在0～30cm的土壤表层;（2）公路两侧土壤重金属含量（Cu和Pb）明显高于国家土壤环境背景值（一级标准）,Pb为中度污染,Cu的污染水平处于轻度与重度之间,Cr的水平为轻度污染;（3）公路两侧土壤重金属污染来源主要是机动车燃料燃烧时排放的废气.

Characteristics of Heavy Metal Pollution in the Soil along the Third Ring South Road in Xuzhou City

Taking the soil along third ring south road of Xuzhou city as research object,the study measured the contents of heavy metal（Cu、Cr and Pb）in the soil.With the help of the results,the characteristics of pollution and distribution law were studied.The research results show：First,concentration of heavy metal in roadside soil decreases with greater distance from the highway,the contents of heavy metal come to the maximum at the distance of 10-30 meters,then gradually decreases with distance,and heavy metals entering into soil mainly accumulate in the surface layer（0-30 cm）.Second,the contents of heavy metal（Cu、Cr and Pb）in the soil on both sides of the road are higher than the first level of national soil environmental background values,the pollution is moderate for Pb,the pollution level of Cu is between light and heavy and light for Cr.Third,the pollution source of heavy metal mainly comes from the exhaust gas of motor vehicles.