Pollution character of heavy metals in river sediments from small towns, Shanghai

By selected three small towns, we studied the pollution character of heavy metals in sediments. Results show that the content of sediments-Zn is between 3.11g/kg and 3.74g/kg, which is heavily excess the criterion of farming fertilized by sullage. The Zn-pollution of sediments has been a territorial and heavily pollution question of small towns, the content of sediments-Pb is between 0.03g/kg and 1.00g/kg, And that of sediments-Cu is between 0.07g/kg and 0.20g/kg. The river sediments has also been polluted by Pb and Cu. To the diversity-region, light-toxicity metals(Fe, Mn, Zn) is less than heavy-toxicity metals(Pb, Cu, Cr). The river sediments from small towns can not be fertilized to the farmlands. By analyzed the relativity of TP-metals(Fe, Cr, Cu, Mn, Pb, Zn) and that of Fe-metals(Fe, Cr, Cu, Mn, Pb, Zn), we can conclude living sewage form small towns is a source of metals in sediments. Street-dust is an important source of sediments-Pb through surface-eroded by living-sewage.