湛江港附近海域潮间带海水、沉积物和贝类体内的重金属

Heavy Metals in Seawater,Surface Sediment and Shellfishes in Tideland of Zhanjiang Harbor

于2005年8月对湛江港附近海域潮间带的海水、表层沉积物和贝类体内的重金属进行了分析,结果表明:海水中的砷优于海水水质Ⅰ类标准,而汞、铜、锌、铅、镉均有不同程度的污染,其中铜、铅、镉污染较为严重,均劣于海水水质Ⅳ类标准;表层沉积物中砷的含量低于全国海岸带背景值,而汞、铜、锌、铅、镉均高于全国海岸带背景值,其标准指数分别为1.35、1.66、1.50、2.08、3.10,汞、铜略高于海洋沉积物质量标准第一类标准,有轻微污染,砷、锌、铅均低于海洋沉积物质量标准第一类标准,未受污染,而镉略高于海洋沉积物质量标准第二类标准,环境受镉污染。各元素在各站点的分布没有规律性。牡蛎和蛤仔体内各重金属含量均优于海洋生物污染评价标准和人体消费卫生标准,其卫生质量良好。

The heavy metals in seawater,surface sediments and shellfishes were analyzed in tideland of Zhanjiang Harbor in August 2005.The results showed that the content of As in seawater was better than the first class Seawater Quality Standard,but the seawater was polluted by Hg,Cu,Zn,Pb,Cd to different degrees.Pollution of Cu,Pb,Cd were so serious that they exceed the fourth class Seawater Quality Standard.The content of As in surface sediments was lower than the background values of the coastal zone in China,and the Hg,Cu,Zn,Pb,Cd were all higher with their standard indices of 1.35,1.66,1.50,2.08,3.10 respectively,and Hg,Cu were little higher than the first class Marine Sediment Quality Standard,showing slight pollution.As,Zn,Pb were all lower than the first class Marine Sediment Quality Standard,showing no pollution.The environment was polluted by Cd,a little higher than the second class Marine Sediment Quality Standard.but the distribution of every element had no regulation in each station.The contents of the heavy metal in Ostrea and Ruditapes were lower than the values of the pollution evaluation standard for marine organisms and the healthy standard for human consumption,and the quality of the Ostrea and Ruditapes were very good.