Speciation of Heavy Metals in the Sediments from Different Eutrophic Lakes of China

The speciation and concentration of heavy metal Cu and Zn were examined by Tessier sequential extraction methods in sediments of Tai Lake,Nansi Lake and Baiyangdian Lake. And the characteristics of overlying water were determined. The results showed three lakes all belong to eutrophic lakes, while Baiyangdian's eutrophication is most serious, the concentration of TP is 0.48 mg/L; in sediments Cu existed mainly in the form of residual and organic-bound fraction, these two forms accounted for more than 75% of the total content. Zn existed in the residual fraction, accounting for more than 50% of the total content, and the Fe/Mn oxide fraction ranked the second; the studies also showed the total “labile” fraction extracted from heavy metals was highest in the Tai Lake, which might bring ecological risk to the water ecological system again, and should be paid more attention to. The correlation between organic matter, Nutrients and heavy metals fractions were analyzed, the relevance is not remarkable. In this paper, the influence of eutrophication to fractions of heavy metal is scarcely.