Research On Spatial Distribution And Pollution Evaluation Of Heavy Metals In Soils Around Thermal Power Plants In Ningxia

In recent years, heavy metal pollutions associated with soil quality assessment have drawn increasing concern and attention. While existing research mostly focused on the soils around fringes, roads or mines, there was little research on heavy metals in soils around thermal power plants.This paper takes two thermal power plants in Ningxia as research area, and uses Geostatistics combined with GIS to study the spatial distribution characteristics and pollution situation of Cu, Zn, Pb, Cr in the soils. The following is the main content:(1) The data of heavy metals collected from the surface of the soils was statistically analyzed. The values of Cu, Zn, Pb, Cr were between the local background and the national secondary standard values.(2) This paper generates spatial distribution maps of heavy metals by using Kriging interpolation model and spatial analysis of GIS. And then this paper analyzes the characteristics of spatial distribution.(3) This Paper carries out single and integrative Pollution evaluation respectively towards the sample data of the amount of the heavy metals in the soils with the integrative index method, and then map according to the evaluation result with GIS technology.(4) This paper uses spatial analysis and statistics to analyze multiple sources of soil heavy metals based on field verification and comes to the conclusion that the distribution of Cu and Zn are more affected by power plants, the distribution of Pb and Cr are more affected by other factors.