Analysis And Assessment The Contents Of The Heavy Metal Of Da-zhai Sponge Fields

As one of the important elements,soil is the foundation of human survival and development.In recent years,because people don’t reasonable use of land,make many pollution into the soil through various channels,the energy balance of the destruction of the original soil,causing soil pollution.Therefore,the investigation and evaluation of soil heavy metal pollution degree and the risk situation,to find out the soil environmental quality,ensure food safety and personal health has very important practical significance.Da-zhai sponge fields As the sampling of this research area,the soil environmental quality of heavy metals in investigation and study,and by using Arcgis software analysis the spatial distribution of soil heavy metals,aims to probe into its and soil physical and chemical properties,magnetic susceptibility,and the relationship between the two forms,further analysis of its influencing factors.（1）Soil samples in the study area,the total amount heavy metal elements have not exceed national secondary standard of soil environmental quality;Besides Cr element,the element content is more than the soil environmental background values in shanxi,coefficient of variation order from high to low is: Cu > Ni > Cd > Pb >Zn > Hg > Cr > As > Mn.Has not been effective state of heavy metalcontent more than TCLP method fits the international standard,the coefficient of variation in turn from high to low is: Zn > Pb > Cd > Mn >Cu.（2）Soil heavy metal spatial variation trend is: the total amount of As,Cd,Cu,high content area mainly concentrated in the Northeast of sampling area,the amount of Mn,Zn and effective Pb,high content area mainly concentrated in the southwest of sampling area,total amount of Hg,effective Cd,Zn,high content area mainly concentrated in the central region of sampling area,the amount of high Cr content area mainly concentrated in the southeast of sampling area,the amount of Ni,effective Cu high content in the area mainly concentrated in the northwest of sampling area,the total amount of Pb,high content area mainly concentrated in the eastern region of sampling area.The accumulation of these elements mainly affected by chemical fertilizer,traffic,the influence of the residents and industrial and mining work together.（3）Correlation analysis results show that no significant correlation between the physical and chemical properties.PH and total amount of Cr,Hg,and Zn was significantly positively related,and the total amount of Cu,Cu,Cr,Pb,Mn,are negative correlation between Zn;Amount of organic matter and total Cr,Hg,effective Zn was significantly positively related,and the total amount of Mn has significant negative correlation;The sand and total amount As significantly negatively correlated;Powder with total amount of As,Cr was significantly positively related;Available phosphorus and total amount of Ni,effectively Cu and Zn was significantly positively related,hygroscopic water and total amount of Cu,Pb,Mn wassignificantly positively related to effective,and the total amount of Ni,effective Zn was significantly negatively correlated.Total amount of As and Cr,Ni,Cu and Ni,Cd,Ni and Cd,Zn and Pb significantly correlation,better correlation between Zn and As,Cr,Hg and other eight kinds of metal elements had no significant correlation.Cu and Pb,Zn,Mn were significantly associated with Cu,Pb,Pb and Zn present negative relationship.Suggests that mutual influence between various forms of heavy metals,the correlation is more complex,the pollution sources.（4）The study area soil magnetic susceptibility value smaller than soil magnetic susceptibility values are in shanxi.X_lfand total amount of Cr,Cd,Ni and Pb,Cu,Cd,Mn showed positive correlation,X_lfare consistent with the change trend of total amount and effective heavy metal.Xfdwith full amount of Cu,Cr,Hg,Ni,Zn,Cd,Pb,effective Zn was negative correlation,with total amount As,effective Mn,Cd,Pb,Mn and Cu were positively correlated.（5）Based on the national soil secondary standard,Single factor pollution index method and Nemerow composite index show that the study area soil was clean;Based on the soil background values in Shanxi Province,Single factor pollution index method show that correspond to each element of soil samples with different degree of accumulation,the accumulation of Hg most significantly,Nemerow composite index show that the soil in the study area is slightly heavy metal pollution.Cumulative index method show that the degree of As,Hg,Pb is relatively high,light pollution,the rest of the heavy metals pollution.Index method of potential ecological harm to the evaluation results showed that Hg belongs to medium ecological harm level,other elements belong to minor damage levels,the study area soil total potential ecological harm is minor ecological harm level.Using Single factor pollution index method and Nemerow composite index to evaluate the effective state content of soil heavy metals in the study area,the results showed that soil belongs to no pollution,clean level.（6）Using the factor analysis method can be divided study area soil into four kinds of factors,main is affected by the cross of the industrial and agricultural activities and transportation.Currently only slightly contaminated soil,local farmers should combine pollution sources,to prevent soil quality deteriorating even further.