南京弘景大道两侧土壤重金属污染分布特征

Heavy Metal Pollution and Distribution in Soils on Both Sides of Hongjing Avenue

为研究交通活动产生的重金属对周边土壤的污染影响,选择了南京江宁区弘景大道路段进行采样研究。在该研究路段设置3个采样区域,对土壤中4种重金属锌、铜、铅、铬进行监测并分析其空间分布特征。结果表明:弘景大道两侧土壤中Cu,Zn,Pb三种重金属含量高于背景值,Cr含量主要分布在背景值之下。重金属含量均未超标于农用地污染标准,属于一般无污染危害。在水平方向上,重金属含量随距离的增加逐渐减少;在道路两侧比较上,东侧重金属含量略高于西侧。

In order to study the impact of heavy metal pollution caused by traffic activities,the Hongjing Avenue section of Jiangning District,Nanjing,was selected for sampling research.Three sampling areas were set up in the research section to monitor the heavy metals generated by four types of traffic activities such as zinc,copper,lead and chromium in the soil and analyze their spatial distribution characteristics.The results showed that the contents of Cu,Zn and Pb in the soil on both sides of Hongjing Avenue were higher than the background value,and the Cr content was mainly distributed under the background value.The heavy metal content did not exceed the agricultural land pollution standard,which is a general pollution-free hazard.In the horizontal direction,the heavy metal content gradually decreased with the increase of the distance.On the two sides of the road,the heavy metal content in the east side was slightly higher than on the west side.