Distribution Features and Evaluation on Potential Ecological Risk of Heavy Metals in Surface Sediments of Sungo Bay

This paper dealt with the distribution and enrichment of heavy metals in surface sediments of Sungo Bay. Simultaneously, the method of potential ecological risk index presented by Lars Hakanson was used to assess their ecological risk. The results showed that the contents of Cu, Zn, Pb and Hg gradually decreased from southwest to northeast, while As was just the opposite, Cd appeared lowest in the middle of the Bay and radiantly increased around. Among all these heavy metals, the pollution of Cd was most serious with the pollution index 0.81. The pollution degree of these heavy metals in surface sediments followed the order: CdZnPbCuAsHg. The potential ecological risk of the heavy metals in this area belonged to light. The pollution degree of these heavy metals in surface sediments of Sungo Bay was CdAsHgPbCuZn. Cd was the potential impact element for the ecological environment of Sungo Bay.