积累指数法对公路旁土壤中重金属污染的评价

目的评价公路旁土壤中重金属污染.方法以319国道龙岩市新罗区路段为例,应用积累指数法对公路环境土壤介质中重金属(Cu、Zn、Cd、Pb、As、Cr、Ni、Fe、Mn)污染叠加进行评价. 结果研究区土壤中Cd、Pb、Cr和Cu元素含量高于福建省土壤背景值,其平均含量分别是福建省土壤背景值的23.6倍、4.6倍、1.7倍和1.5倍.已形成强污染的元素为Cd,中等污染的元素为Pb,轻污染的元素为Cr.土壤对重金属元素的吸附及污染程度Cd＞Pb＞Cr＞Cu＞As＞Zn＞Ni＞Mn＞Fe.结论公路旁土壤中Cd、Pb污染严重,重金属污染物质主要来源于机动车辆燃料和轮胎中所含微量重金属成分.

Assessment on Pollution of Heavy Metal in Soil along Road with Method of the index of geoaccumulation

Objective To assess the pollution of heavy metals in soil along road. Methods The sampling of soil was done along the section of No.319 Nation Road located in the Xinluo district of Longyan city and heavy metals(Cu,Zn,Cd,Pb,As,Cr,Ni,Fe,Mn)in soil along road was assessed by method of geoaccumulation. Result The contedts of Cd,Pb,Cr and Cu in the soil in the observed area were higher than soil environmental background values in Fujian Province, their average contents being 23.6,4.6,1.7 and 1.5 times. The soil samples were highly polluted by Cd, next by Pb, and slightly by Cr. The absorptive capacity of soil to heavy metals and its pollution levels were in the following orders:Cd>Pb>Cr>Cu>As>Zn>Ni>Mn>Fe. Conclusion The pollution of Cd and Pb in the soil along road was serious and the main sources were the trace heavy metals in exhaust fume and tires of automobiles running on the road.