Environment Geochemistry Research And Environment Assessment Of Heavy Metal In Paddy Soil Around Tangjia Zink-Pb Mine, Hanyuan Sichuan

This thesis have made a detailed environment geochemistry research on the paddy soil aroud Tangjia zink-lead mine in Hanyuan Sichuan.The total concentrations of Pb Zn Cu Cd Ni Ag and the fractions of Pb Zn Cu Cd Cu by means of sequential extraction was analyzed.the inner relationship between elements chemic and physical character of soil and pollution source was found out through the correlation analyse.Then the geoaccumlation index Nemerow index and potential ecological risk assessment was made and compared: the main researching results are as follows.1. The paddy soil around Tangjia zink-lead mine was seriously polluted by Pb Zn Cd and there are significant correlations between these three elements it proves that these three elements come from the same source.2. The total concentration of Pb Zn Cd decrease as the distance between mine and road for transporting ore distance between mine and the farmland where samples were get increase it proves that soils are polluted by both exploitation and transportation of ore.3. The distributing characters of elements in area A and B in different fractions are similar which proves these elements come from the same source. But there is also some differences because of the difference of pH.4. There are positive correlations between the fractions of Pb Zn Cd.It means one fraction can be transformed into each other.5.Geoaccumlation index Nemerow index and potential ecological...