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^?, SO₄^2- 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^?>SO₄^2-. The release potential of heavy metals in the presence of each anions was in the following order: CdCu>Zn≈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 SO₄^2- and HCO₃^?, the release of the heavy metals from marine sediments was not obvious.