Evaluation of Farmland Soil Heavy Metal Pollution in Four Villages in Datong District of Daqing

In recent years,dued to the oil exploration and the rapid development of chemical industry in Daqing city,resulted in field soil heavy metal pollution around the farmland.For better understanding of this situation,it had select 70 samples in four villages in Datong for sampling and analyzing.And it evaluated by using single-factor of pollution index method and Nemerow integrated pollution index method.The results showed that from single factor pollution index,Hg factor pollution index relative high,Pb factor pollution was occasionally exceed the standard in four Township.From integrated pollution index,they all existed soil heavy metal pollution.Its pollution index was:Shuangyushu villageTaiyangsheng villageBajingzi villageLaoshantou village,which 61.4% was clean level,the pollution level was for security,37.2%belonged to still clean,pollution level was for alert level,1.4%belonged to light pollution.