沈大高速公路两侧土壤重金属污染分布特征研究

对沈大高速公路沈阳、辽阳、鞍山、营口和大连段两侧土壤中铅、镉、锌、铬、镍和铜的含量进行测定。结果表明:在距路肩250 m范围内,各段土壤中铅、镉均有不同程度的累积,锌、铬、镍、铜污染不显著。土壤中铅、镉最大污染指数为3.34和2.42,污染较高值出现在距路肩50 m内,尤以20—40 m为高,除铅外其余重金属含量在距路肩150 m以外趋于背景值,但土壤中铅污染为250 m以外。

Distribution characteristics of soil heavy metal pollution at both sides of the roads along Shenyang-Dalian expressway

The contents of Pb,Cd,Zn,Cr,Ni and Cu in the soil at both sides of the roads in Shenyang,Liaoyang,Anshan,Yingkou and Dalian were determined along Shenyang-Dalian expressway.The results indicate that soil Pb and Cd contents in each section are accumulated in the range of 250 m at both sides along the expressway,while the contents of Zn,Cr,Ni and Cu are lower.The maximum pollution indices for soil Pb and Cd are 3.34 and 2.42,respectively.The higher values of soil Pb and Cd contents occur within 50 m to the road shoulder,especially in the ranges from 20 m to 40 m.Most soil heavy metal contents are close to the background values at 150 m away the expressway,while soil Pb content is at 250 m.