秦岭柞水县下梁镇金属矿区土壤重金属富集污染研究OA北大核心CSTPCD

In order to explore the impact of mineral resources development on the accumulation of heavy metals in soils,the Daxigou iron mine area and surrounding areas in Zhashui County were taken as the re-search objects.The contents of heavy metals,including Cr,Ni,Cu,Zn,Pb,As,Hg and Cd in the soils of the study areas were measured by using the relevant national standards and methods.The environmental quali-ty of the soils and pollution status in core area,buffer area,transition area and control area were evaluated by single factor index method and Nemerow comprehensive pollution index method.The results showed that in the core area,except for Cr,Cu and As,the other heavy metals did not exceed the standard values.The order of single factor pollution index was PCu＞PAs＞PCr＞PCd＞PZn＞PPb＞PHg.In buffer area,except for As and Cu that exceeded relative standard,the other heavy metals did not exceed the standard,and the order of single factor pollution index was PCu＞PAs＞PCr＞PCd＞PZn＞PHg＞PPb.In the transition area,except for Cu,the other heavy metals did not exceed the standard values,the order of single factor pollution index was PCu＞PAs＞PCr＞PCd＞PHg＞PZn＞PPb.In the control area,all the heavy metals did not exceed the standard,the order of single factor pollution index was PCr＞PCu＞PAs＞PPb＞PZn＞PCd＞PHg.The potential ecological risk assessment showed that the potential ecological risk of heavy metal pol-lution in the soils of Zhashui mining area was slight,monitoring should be strengthened in the future to guard against further soil contamination resulting in potential ecological risks of medium to high levels.