Aquatic environment

Fractionation of heavy metals in shallow marine sedimentsfrom Jinzhou Bay, China


Shaofeng Wang , Yongfeng Jia , Shuying Wang , Xin Wang , He Wang , Zhixi Zhao , Bingzhu Liu

DOI:

Received March 02, 2009,Revised July 08, 2009, Accepted , Available online

Volume 22,2010,Pages 23-31

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China, which has been heavily contaminated by nonferrous smelting activities. The concentrations of Cd, Cu and Pb in sediments were found to be 100, 13 and 7 times, respectively, being higher than the national guideline (GB 18668-2002). Sequential extraction test showed that 39%–61% of Cd were exchangeable fractions, indicating that Cd in the sediments posed a high risk to local environments. While Cu and Pb were at moderate risk levels. According to the relationships between percentage of metal speciation and total metal concentration, it was concluded that the distributions of Cd, Cu and Pb in some geochemical fractions were dynamic in the process of pollutants migration and the stability of metals in sediments of Jinzhou Bay decreased in the order of Pb > Cu > Cd.

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