Impact of anions on the heavy metals release from marine sediments.

Marine sediments from Lianshan Bay in Huludao, China, were studied in laboratory. A series of simulated experiments were carried out to investigate the influences of three kinds of anions Cl-, SO42- and HCO3 on the release of Cd, Pb, Cu and Zn from the sediments. The results showed that the sequences about the impact of the three anions were Cl- >HCO3 > SO42. The release potential of heavy metals in the presence of each anions was in the following order: Cd>>Cu>Zn approximately equal to Pb. The correlations were positive between Cl content and the quantity of Cd released from the marine sediment, whereas there was no significant relationship between Cl-content and amount of Cu and Zn released. For SO42- and HCO3-, the release of the heavy metals from marine sediments was not obvious.