Distribution Characteristics and Pollution Evaluation of Heavy Metals in Hangjinqu Expressway Roadside Soil

Soil heavy metal content (Pb, Cd, Ni, As, Cr) was determined at Huanmo and Luobu village along Hangjinqu Expressway in Zhejiang province in June 2016.The results showed content of Cr was the highest, followed by Pb or Ni, and Cd at two villags.The contents of Pb, Cd, Ni and Cr of the most sampling sites were significantly higher than the background value of soil in Jinqu Basin.The trends of Pb and Ni cotnent were increased and then decreased with the distance from the expressway within 160 m, while that of Cd and Cr were decreased gradually.The conclusion indicated that forest belt of 40 m had the best protective effect on soil.