Abstract
Based on the measurement of 12 sediment samples from the Tuohe River of Suzhou City, Anhui Province, the heavy metal concentration of Cr, Cu, Zn, As, Pb and Ni were analyzed. Using the method of geoaccumulation index and potential ecological risk index, this paper evaluated heavy metal pollution characteristic of river sediment in Suzhou City. The result showed that: 1) most heavy metals concentrations were higher than soil background value of Anhui province, especially Cu and Zn, higher 5.19 times and 6.69 times than the background value, respectively, which pollution order was Zn> Cu> Pb> As> Ni> Cr. 2) among 6 heavy metal, the Igeo displayed Cu and Zn were the main pollution elements that the pollution was more serious; Cr is no pollution; As, Pb and Ni belonged to no pollution to light pollution. 3) all potential ecological risks index were less than 150 indicated the sediments were of low risk. For individual potential ecological risk index, their pollution order was: Cu > Pb > As > Zn > Ni > Cr. Cu and Pb had greater contribution rate to the potential ecological risk of sediment.
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