Spatial Distribution And Pollute Evaluation Of Trace Elements In Surface Soil Of Mining City

Urban soil trace elements enrichment has became the problem that people pay attention to. trace elements producted by auto tire friction-, exhaust emissions> improper disposal of coal gangue and fly ash and power generation. Through a series of physical and chemical reaction entered directly into the environment, trace elements enter into the soil, which cause the soil trace elements enrichment and harmful to human health. This article selected Tian Jiaan and Datong of Huainan as research area. Main research as following aspects:(1) The surface soil spatial distribution analysis of soil trace element in Huainan cityAs a whole, the content of Hg is higher, the content of As, Cd and Hg is partly higher, the content of Cu and Cr is lower. The average content of soil trace elements in industrial area of Huainan city is higher than area of commercial、residential cultural、 educational and farmland protection areas. Urban soil trace elements variation coefficients of huainan city is larger, the variation coefficient of As%Hg、Pb、Cd is between0.1to1.0, belongs to the medium variation; the variation coefficient of industrial, commercial, farmland protection areas is greater than0.1, belongs to medium variation; in residential, cultural and educational area the variation coefficient of Cr and Cu is less than0.1, belongs to the weak variation.(2) Using different methods evaluate trace elements environmental quality of surface soil in HuainanEvaluate trace elements environmental quality of surface soil in Huainan by the methods of Single factor index methods Nemero index method-. Geo accumulation index method、Potential risk index method and ArcGIS combined with the Nemero index and Potential risk index method, get trace element enrichment degree of research area from high to low in turn is:Hg>Cd> As> Cu> Pb> Cr.(3) Source of trace element enrichment and relationships between mining activities and trace element pollutionThe ecological environment around the city is serious, It has great relation with coal mining in Huainan, there are many important reasons of trace elements enrichment in soil, such as improper disposal of coal gangue and fly ash、coal-fired power plant. It also has great relation with development of related mining industry and Automobile exhaust emissions. Last, trace elements emissed by coal combustion is one of the main enrichment reasons of trace elements in city atmosphere.