THREE ASSESSMENT METHODS ON HEAVY METALS CONTAMINATION IN RIVER SEDIMENTS OF SHANGHAI SUBURBAN AREA

Base on three assessment methods，the paper evaluated thirteen heavy metal elements ( Ag，As，Be，Cd，Cr，Cu，Ni， Pb，Ti，Sb，Se，Zn，Hg) sampled from river in Shanghai suburban area． The results showed that thirteen heavy metals content were above the limit of detection，the avevage content of Ag，As，Be，Cd，Cr，Cu，Ni，Pb，Ti，Sb，Se，Zn，Hg was 0. 8， 28. 0， 0. 5， 0. 9， 480. 4， 204. 6， 58. 6， 52. 0， 1. 4， 3. 8， 0. 2， 890. 2， 0. 1 mg/kg，respectively． Pollution risk assessment results showed that the sediments were polluted by heavy metals． The pollution contribution of Cd，Cr，Cu and Zn in four locations was much bigger．