西安城市路边土壤重金属含量与污染评价

Heavy Metal Concentration and Pollution Assessment of Roadside Soil in Xi′an City

选择西安市东西和南北方向各两条交通主干道,采集道路两侧的表层土壤样品,通过X-Ray荧光光谱仪测定其重金属的含量。结果表明:西安城市路边土壤中Co、Cr、Cu、Mn、Ni、Pb和Zn的平均含量均高于陕西土壤元素背景值和中国土壤元素背景值,其中,Cu、Pb和Zn的富集程度高,累积量大,As、Mn和Ni累积量相对较小。地累积指数评价结果显示西安城市路边土壤中Co、Cr、Cu、Pb和Zn轻度污染,As、Mn和Ni无污染。

Heavy metal concentration was determined in the roadside soil collected from the four directions： north to south and west to east main streets of Xi＇an by using a X-Ray Fluorescence Spectroscope.The results indicated that the mean concentrations of Co,Cr,Cu,Mn,Ni,Pb and the Zn in the roadside soil of Xi＇an were higher than the background values of Shaanxi soil and Chinese soil.Cu,Pb and Zn were highly enriched and accumulated.Their enrichment levels in roadside soil were higher than As,Mn and the Ni.The pollution assessment results of Geo-accumulation index showed that Co,Cr,Cu,Pb and Zn were mild pollutant,while no As,Mn and Ni polluted.