Research Of Heavy Metals Contamination Status In Soil And Development Risk Over Adiusted Industrial Sites In A Certain District Of Shanghai

With the lack of land,weak quality of soil and industial construction adjustment,The Research is aim to have a preliminary knowledge of site contimanation and regional soil pollution status of 115 selected industial brown fields.It includes concentration analysis of 6 heavy metals(Cr?N?Cu?Zn?Pb?Cd),the quality assessment of soil by single factor index and Nemerow comprehensive pollution index,analysis of relationship between different pollutants,Space distribution of concentration and quality assessment result on GIS and Risk assessment of contaminated sites by RAG-C.The conclusions are as follows:1)The Concentrations of 6 heavy metals nearly exceed the background value,but overall condition is safe;Pb?Ni and Cr hold rather higher concentration than Cu?Zn and Cd;Both of Chemical and Petrochemical Industry and Rubber and Plastic Industry express harder contamination on heacy meatals;Malu?Xuhang and Jiangqiao Have a higher pollution level than other regions of Jiading.2)There is apparent correlation between Cr and Ni,Ni and Cu?Zn?Pb,Cu,Cu and Pb?Zn and Pb by Pearson Correlation Coefficien.but the correlation between Cd and the other 5 elements seems not obvious;Cd may have a different source,the other 5 elements possiblely have similar source.According to the result of pollutants regional distribution and picturized pollution index,the area between Malu and Baoshan District have highest contamination level,especially Cr?Ni and Pb.3)Cancer Risk and Non-Cancer Risk mainly exist in Cd,there are 60 sites which accounted for 52.2%of total selected sites involved.It means Cd pollution in selected sites is rather heavy;over 50%sites in Nanxiang?Xuhang and Waigang,the number of Xuhang is 77.8%.