Characteristics And Evaluation Of Heavy Metal Pollution In Soil Around Coal Mine

In this paper,the coal mining area of Xinmi and Dengfeng city is taken as the research object.The waste water and dust that produced in the process of coal mining released the heavy metal into the surrounding environment,which pollutes the soil of the farmland nearby and threatens the health of mankind.In this study,based on the study of soil sampling and the dection of physical and chemical properites,soil heavy metal chromium,cadmium,copper,lead,nickel and zinc were detected by ICP-AES and laboratory physical and chemical properties.The soil physical and chemical properties of each mining area were analyzed by using excel and origins software.Take the Soil Environmental Quality Standard(GB15618-2008)as the evaluation standard,the single factor pollution index method and the comprehensive pollution index method were used to evaluate the heavy mental's contribution degree of a heavy metal to soil pollution and analyze the relationship between the soil environmental background value and the soil environmental quality standard.The research and its results are as follows:(1)In the prevailing wind direction,the farther away from the mining area,the soil pH value,organic matter in some areas showed a downward trend.In the heavy metal content studied: the farther away from the mining area,chromium,cadmium and copper content of a downward trend.(2)With the Soil Environmental Quality Standard(GB15618-2008 secondary)as the evaluation standard,it can be seen that the heavy metal element Cd in the HongDa coal mine area exceeds the standard;the heavy metal element Pb in the HST coal mine area is excessive;the six heavy metal elements researched in the ZhengXingYong Xiang coal mining area exceed the standard;the heavy metal element studied in the BaiPingXiang coal mine area exceed the standard;the heavy metal elements in the XinDongPing heavy metal content exceed the standard;the heavy metal elements Cu and Zn in the GangGou coal mine area exceed the standard.(3)With the Soil Environmental Quality Standard(GB15618-2008 secondary)as the evaluation criteria,HongDa coal mine soil heavy metal content are not exceed except for the heavy mental elements Cd.In the HuiShuTing coal mine area,the contents of Cd,Cr,Cu,Ni and Zn are not exceeded.The six kinds of heavy metal elements in Zheng XingYongXiang coal mining area of are not exceed.The six kinds of heavy metal elements studied in the BaiPingXiang coal mine are not exceeded except for heavy mental element Zn.The five kinds of heavy metal elements in XinDongPing are not exceeded in addition to heavy metal element Zn.The four kinds of heavy metal elements in GangGou coal mining area are not exceed in addition to heavy metal elements Cu and Zn.(4)Based on the soil background value in Henan,Cd,Cr,Cu,Pb,Ni,Zn in soils studied in the HongDa coal mining area are exceeded in different degrees,and the maximum excess is Cd>Pb> Cu>Cr>Zn>Ni.The contents of heavy metals in the soil of Hui ShuTing coal mine are exceeded in different degrees,and the maximum excess is: Pb>Cd>Cu>Zn>Cr>Ni.The six heavy metal elements in ZhengXing Yong Xiang coal mine area are exceeded in different degrees,and the maximum excess is shown as follows: Cu>Pb>Cd> Zn>Cr>Ni.The six heavy metal elements in BaiPingXiang coal mine area is are exceeded in different degree,and the maximum excess is Cd>Cu>Pb>Ni>Cr>Zn.The six heavy metal elements studied in the XinDong Ping coal mine have different degrees,and the maximum exceeding excess is Cu>Pb>Cd> Zn>Cr>Ni.The six heavy metal elements studied in the GangGou coal mine have different degrees,and the maximum exceeding excess is Zn> Cd> Pb>Cu>Cr>Ni.(5)Taking the soil background value of Henan Province as the evaluation standard,the maximum excess of soil heavy metal elements in HongDa coal mining area is Cd>Pb>Cu>Cr>Zn>Ni.The maximum excess of the HuiShuTing coal mine area is as follows: Pb>Cd>Cu>Zn>Cr>Ni.The maximum excess of the ZhengXingYongXiang coal mine is Cu>Pb>Cd>Zn>Cr> Ni.The maximum excess of the BaiPingXiang coal mine is Cd>Cu>Pb>Ni>Cr>Zn.The maximum excess of the XinDongPing coal mine is Cu>Pb>Cd> Zn>Cr>Ni.The maximum excess of the GG coal mine is: Zn>Cd>Pb>Cu>Cr>Ni.Different coal mining areas are characterized by different degree of pollution,and based on the soil background value of Henan Province,pollution among these areas is as follows:Ganggou>HongDa>XinDongPing>Bai PingXiang> HuiShuTing>Zheng Xing Yong Xiang.