POLLUTION ASSESSMENT AND SOURCE APPROXIMATION OF HEAVY METALS IN THE SOIL ALONG A MAIN ROAD WITH HIGH DENSITY OF TRAFFIC

Heavy metals accumulated in farmland soil can influence the food safety and human health, and therefore, the protection of the environment of the farmland soil along the trafficway is of great significance. In order to find out the pollution status of soils along the Suzhou Avenue, the contents of Cr, Ni, Cu, Zn and Pb in 105 soil samples have been measured, and the pollution status was evaluated by a series of methods (including single pollution, comprehensive pollution and potential ecological hazard indexes), then the sources were determined by combining spatial distribution characteristics and mathematical statistics (correlation and factor analyses). The results showed that Ni, Cu, Zn and Pb were polluted with varying degrees. The potential ecological hazard index was Cu > Pb > Ni > Cr > Zn. The contents of Zn and Pb in soil were affected by traffic, while the contents of Cr, Ni and Cu were related to geological or agricultural factors.