The Analysis and Evaluation on Heavy Metal Pollution of Topsoil in Chinese Large-scale Cities

The thesis mainly focuses on the analysis of the current topsoil condition on the heavy metal particles and its compounds, and concludes a new evaluation model on pollutant source and pollution level. According to the provided data, the pollution spreading models on the corresponding heavy metal particles can be set up through Kriging and Surfer software, then people can get the weight of the pollution level on various of metallic elements in each topsoil area by using entropy method, and make a conclusion that Cu and Hg are the current main soil pollutant sources in many large cites around the country. Thus, based on the actual background of the research topic, three reasonable assumptions have been proposed in the paper, including the qualitative explanation on the function of the metallic pollution spreading regulation, and the analysis on the advantages and disadvantages of the detection model on the above corresponding various heavy metal particles.