连云港市海域海洋倾倒疏浚物的重金属污染及其潜在生态风险

Heavy Metal Pollution and Potential Ecological Risk of Marine Dredged Materials in Lianyungang Sea Area

为加强连云港市海域的海洋倾废管理和海洋生态环境保护,文章在该海域主要疏浚工程区的49个站位开展采样调查,并采用潜在生态风险指数法,评价表层疏浚物的重金属污染程度及其潜在生态风险。研究结果表明:连云港市海域疏浚物质量总体较好,重金属含量的变化范围和分布的区域差异较小,其中含量最高的为锌、最低的为汞;污染程度最大的重金属为镉,较小的重金属为铬;潜在生态风险指数由大到小的重金属依次为镉、汞、砷、铜、铅、铬和锌,除镉和汞(连云港港区)外,其余潜在生态风险等级为低;潜在生态风险指数由大到小的区域依次为连云港港区、徐圩航道、外航道内段、田湾核电站取水口和外航道外段,除连云港港区外,其余区域的潜在生态风险等级为低;应高度关注镉和汞等重金属的污染状况以及近岸区域的潜在生态风险。

In order to strengthen the management of marine dumping and the protection of marine ecological environment in Lianyungang sea area,49 stations in the main dredging engineering areas were sampled and investigated.The potential ecological risk index method was used to evaluate the pollution degree and potential ecological risk of heavy metals in surface dredged materials.Results showed that the quality of dredged materials in Lianyungang sea area was better in general,and the variation range and distribution of heavy metals content were relatively small.The highest content of heavy metals was Zn,the lowest was Hg,the heaviest pollution was Cd,the smaller was Cr.The potential ecological risk indexes of heavy metals from large to small were Cd,Hg,As,Cu,Pb,Cr and Zn,and the potential ecological risk levels were low except Cd and Hg (Lianyungang port area).The potential ecological risk indexes from large to small were Lianyungang port area,Xuwei channel,inner section of Lianyungang channel,water intake of Tianwan nuclear power station and outer section of Lianyungang channel,the potential ecological risk levels of other areas were low except Lianyungang port area.Pollution status of heavy metals and potential ecological risks in coastal areas should be highly concerned.