| Samples of seawater and surface sediments were collected in Anpu Port,Zhanjiang in September 2022,the contents of seven heavy metal elements including Hg, As, Cu, Pb, Zn, Cd, and Cr 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 concentrations of heavy metals in seawater of Anpu Port were in sequence of Zn>Cu>As>Pb>Cr>Cd>Hg, and the concentrations of all stations met the Class I seawater quality standard. The concentrations of heavy metals in surface sediments showed an increasing trend compared with 2015. The content of TOC in sediment was positively correlated with heavy metals Hg, As, Cu, Pb, Zn and Cd, indicating that the distribution of heavy metals in surface sediments were affected by TOC. The pollution extent of heavy metals in the sediments by geo-accumulation index followed the order Hg>Cu>Pb>As>Cr>Cd>Zn. The evaluation results of the potential ecological hazard index method showed that the average value of heavy metal RI at each station of Anpu Port was 179.55, suggesting the moderately ecological hazard, and the heavy metal Hg had a heavier ecological hazard. |
