Research And Assessment Of Heavy Metal Pollution In Soil Of Some Areas In Suzhou

As the pace of industrialization, modernization and urbanization accelerated, environmental pollution, especially the soil heavy metal pollution, has become increasingly serious in our country. The pollution greatly affects the quality of the agricultural products and the health of the human beings. People have paid more and more attention to the heavy metal pollution in soil, but the research on the soil heavy metal pollution in different functional areas which is strongly influenced by human activities is rare. Therefore, in this paper, we take some areas in suzhou as the investigated site and study the content and distribution of seven kinds of heavy metals, Hg, As, Hg, Pb, Cd, Cr, Ni and Zn, in soil of different functional areas. Further, the soil quality of some areas in suzhou was evaluated by multiple methods such as the single factor index, Nemerow comprehensive pollution index, pollution load index and accumulation index. Finally, the potential ecological risk analysis and evaluation of soil heavy metal pollution in the regions was carried out by using the potential ecological hazard index method.The main results of this paper are as follows:1. The mean value of soil pH is 7.57, which is a significant characteristic of urban soil;2. The potential ecological risk index of heavy metals in soil is in the rank of Hg>Cd>Pb>As>Zn>Ni>Cr; the pollution index and the variation coefficient of mercury and cadmium in the regions are relatively large and mercury and cadmium are the major pollutants.3. The comprehensive pollution index of heavy metals in different functional areas ranks as industrial zone (4.53)> commercial district (1.83)> high parish (1.29)> living area (0.98)> scenic area (0.45); The heavy metal pollution load index decreases successively from industrial area (2.15), commercial area (1.33), residential area (1.16), high parish (0.83) to scenic area (0.60).