Correlation Analysis of Heavy Metal Pollution Factors in Urban Soil
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Urban soil is affected by human activities and has obvious characteristics of heavy metal accumulation. The understanding of the relationship between the abundance and morphology of heavy metals in these soils and the physical and chemical properties of soil and the surrounding environmental factors will help to better protect and repair the urban soil ecosystem. Therefore, how to process the detected data in order to detect pollution sources in time has become an important task of environmental protection. Single factor evaluation method and multi factor comprehensive evaluation method were used to evaluate the degree of heavy metal pollution in different regions. Living area, industrial area and main road area are heavily polluted areas. The park green area is a middle pollution area, and the mountain area is a light pollution area. The contents and morphological characteristics of four heavy metal elements Pb, Zn, Cu and Cd in soil were studied in this paper. The grey relational analysis was used to analyze the influence factors of heavy metal pollution in urban soils of Nanjing. The most important factor is the distance from the industrial area, followed by the soil clay content. The proportion of traffic flow, production and domestic waste in soil and soil organic matter had little effect on heavy metal pollution in urban soil.
Urban soil; heavy metal pollution; grey relational grade analysis