The comprehensive evaluation method of the heavy metals pollution in the topsoil of the city

In this paper,the comprehensive evaluation method including the analysis of the spatial distribution of heavy metals, the evaluation of geo-accumulation index and ecological rick index is applied to evaluate the pollution of the topsoil in the city. It analyzes the main pollutants qualitatively and evaluates the degree of pollution of heavy metals and ecological harm. In the case of existing data, the spatial distribution of main heavy metals is drawn according to the interpolation and the average concentration of heavy metals. It uses the comprehensive pollution evaluation model to analyze the degree of pollution in different function areas. The result show that the pollution of the industrial zone is the most serious, it is mild-moderate and the comprehensive evaluation index is 0.647, the pollution of the Mountains is the lowest, it is not polluted and the comprehensive evaluation index is -0.501.