榆神高速公路沿线土壤重金属污染评价

Evaluation of heavy metal pollution in soil along YuShen-Motorway

为了研究公路两侧土壤重金属污染程度,沿线采集榆神高速公路两侧土壤样本,测定土壤内重金属Pb、Zn、Cu、Cd含量,分析其污染程度。结果表明:榆神高速公路两侧重金属污染程度各不相同,重金属Pb、Zn污染程度达到轻度污染,Cd达到中度污染,Cu接近中度污染。重金属Pb、Zn、Cu、Cd含量均超过土壤背景值。土壤内重金属污染的Muller指数数值大小排序为Cd>Cu>Pb>Zn,Cd生态毒害效应最严重,Zn危害最小。此外,重金属含量变化差异与土壤有机质以及粒度组分密切相关。

In order to study the pollution degree of heavy metals in soil on both sides of motorway, soil samples from both sides of motorway were collected, the contents of heavy metals Pb, Zn, Cu and Cd in soil were measured, and their pollution de- gree was analyzed.The results showed that the pollution levels of heavy metals on both sides of motorway were different, the pol- lution degree of heavy metals Pb and Zn reached slight pollution, Cd reached moderate pollUtion, and Cu was close to moderate pollution,. By comparison to the background values,the contents of heavy metals Pb, Zn, Cu and Cd all exceeded.Muller index of heavy metal pollution in soil is sorted as Cd〉Cu〉Pb〉Zn, and Cd has the most serious ecological toxicity, and Zn is the least harmful. In addition, the difference of heavy metals content is closely related to soil organic matter and grain size components.