| In order to understand the situation of heavy metal pollution in the northwest bay of Leizhou Peninsula, the contents of seven heavy metal elements including Hg, As, Cu, Pb, Zn, Cd, and Cr in seawater and surface sediments from Anpu Port, Zhanjiang were analyzed. And the heavy metal pollution of sediments were evaluated by geo-accumulation index method and the potential ecological hazard index method. The results showed that the average concentrations of Hg, As, Cu, Pb, Zn, Cd and Cr in seawater of Anpu Port were 0.011μg/L, 0.7μg/L, 2.5μg/L, 0.43μg/L, 10.3μg/L, 0.08μg/L and 0.1μg/L, respectively, and the concentrations of all stations met the Class I seawater quality standard. The average concentrations of Hg, As, Cu, Pb, Zn, Cd and Cr in surface sediments were 0.065×10-6, 11.7×10-6, 12.6×10-6, 21.6×10-6, 29.3×10-6, 0.12×10-6, 36.1×10-6, respectively. The content of TOC(Total Organic Carbon) in sediment was positively correlated with heavy metals Hg, As, Cu, Pb, Zn and Cd, indicating that the concentrations of heavy metals in surface sediments were affected by TOC. The pollution extent of heavy metals in the sediments by geo-accumulation index showed that Hg and Cu were mild pollution, while As, Pb, Zn, Cd and Cr were no pollution. The evaluation results of the potential ecological hazard index method showed that the average value of heavy metal RI (Risk Index) at each station of Anpu Port was 179.55, suggesting the moderately ecological hazard, and the heavy metal Hg had a heavier ecological hazard. |
