盐城滩涂表层沉积物重金属污染状况分布

he distribution of heavy metal in the surface sediment in Yancheng beach was studied in early November, 2006. The results showed that the average concentration of Zn, Ni, Cu, Pb and Cd was 316.46 mg/kg, 37.01mg/kg, 35.37mg/kg, 11.85mg/kg and 0.49 mg/kg respectively. And Zn and Cd level had exceeded the secondary standard as stipulated in the Environmental Quality Standard for Soils (GB15618-1995) in China. The differences between concentrations of selected heavy metals in the different sampling sites were found. Exactly, the highest concentrations of Ni and Cu were found both in the sluice gate of Zhu Port, and that of Zn and Pb were in the Chuanshui Port while that of Cd was in the Coastal Port. Furthermore, correlation analysis didn’t show that there existed significant correlation among the concentrations of heavy metals, suggesting that in the recent years the frequent human activities have caused a certain impact on the ecosystems in the Yancheng beach. Additionally, Geoaccumulation Index analysis indicated that in the surface sediment in Yancheng beach there existed Zn and Cd pollution seriously while Ni and Cu pollution were in some regions, thus more attention should be paid to such heavy metal pollution.