Analysis and Evaluation on Concentration of Heavy Metals in Soils of Industrial Area and Suburb Cropland of Luoyang City

The concentration and distribution character of Pb,Zn,Cu,Cr,Fe and Mn in industrial district of Luoyang City was studied preliminarily.The average concentrations of Pb,Zn,Cu,Cr,Fe and Mn in industrial districts were higher than those in suburb cropland,but the concentration of Mn was less than that in suburb cropland.With the increasing of the distance from industrial area,the concentrations of the heavy metals went down.According to the background contents of these elements under the natural soil condition,the status of soil pollution by heavy metals was evaluated by using single factor pollution index(PI)and integrated pollution index(IPI).The results indicated that not only the soils in industrial area but also the cropland were polluted by Pb,Zn,Cu,and Cr.The main sources of heavy metals in soils of industrial district were industrial pollutant discharge and vehicle emission,while,Pb,Zn,Cu and Cr in suburb cropland mainly attributed to the sedimentation of pollutants caused by industrial production and agricultural pollution,such as pesticides,fertilizer,sewage irrigation,etc.