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Distribution Characteristics and Pollution Evaluation of Heavy Metals in the Seawater and Surface Sediments from the Zhanjiang Harbor
Pages: 74-82
Year: Issue:  2
Journal: Ocean Technology

Keyword:  Zhanjiang harborseawatersedimentsheavy metalspotential ecological risk assessment;
Abstract: According to the survey data in January 2013 (Winter) and June 2013 (Summer), this paper studies the heavy metals (copper, zinc, lead, cadmium, arsenic and mercury) in seawater and surface sediments from the Zhanjiang Harbor. The survey results show that the contents of heavy metals in offshore sea are higher than in deep sea, and that those in the northern sea area of the Donghai Island are higher than in the eastern sea area. Comparison of the survey results indicates that the average contents of heavy metals are higher in summer than in winter. The single factor index method is applied to analyze heavy metal pollution in seawater. The results show that in the two seasons, the seawater is seriously polluted by Pb and slightly polluted by Cu and Zn. The contents of other elements (Cd, As and Hg) are not over the National Se a Water Quality Standard for the corresponding values in seawater. The respective factor indices of heavy metals in seawater in summer are higher than those in winter, which might be due to many pollutants from land sources in summer. All heavy metal contents in marine surface sediments are all lower than standard values, showing that the environmental quality of sediments is in good condition. The Potential Ecological Risk Index method proposed by Swedish scientist H?kanson is applied to evaluate the harm of heavy metals. The results indicate that the potential ecological risk of heavy metals in the sediments is relatively slight, and the sequence of their potential ecological risk is Hg>As>Cd>Pb>Cu>Zn.
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