衡枣高速公路两侧土壤重金属的污染状况

Heavy Metal Pollution Degree of Soils on Both Sides of Hengyang-Zaomupu Highway

以年均车流量50万辆的衡枣高速公路为例,研究了高速公路运营4年后对其两侧145 m范围内土壤重金属Pb、Cu、Zn的污染状况。结果表明在距公路35 m以内,土壤中重金属的含量相对较高,其平均含量大小为Zn>Pb>Cu,且各重金属含量随着距离的增大而逐渐减小,依据GB 15618-1995标准,衡枣高速公路两侧土壤环境质量在Ⅱ类以上。目前,高速公路运营对公路两侧的土壤已产生影响,但影响程度较低。

The heavy metals(Cu,Pb,Zn) in the soil of Hengyang-Zaomupu highway running 4 years,whose vehicle flow was about 500 thousand each year,was investigated.The results showed that the Zn's average content of the soils on the both sides of highway was the highest,the next was Pb,Cu was the lowest relatively.Within 35 meters to the highway,as the distance increased,the content of heavy metals pollution reduced.Out of the range of 35 meters,the content was little,and had no changes basically.According to the standards of GB 15618-1995,the environmental quality grade of the soils on the both sides of highway is above Ⅱ level.The effect of highway's operation to the soils is still little now.