南海中南部水域海水中重金属的分布特征

摘要

2010年秋季对我国南海部分海域进行调查,按照采样标准规范采集了16个站位不同水层的海水样品,采用附有ISIS进样系统的电感耦合等离子体质谱法直接测定了海水中痕量重金属Cr、Cu、Zn、As、Cd及Pb元素含量,考察了重金属在南海海水中分布状况；同时测定了海水样品的盐度、温度、pH、溶解有机碳(DOC)及溶解氧(DO),分析各项参数垂直分布变化规律及其与重金属的分布变化相关性.结果表明,南海海水中重金属含量较低,变化范围较小,除部分站位Pb元素外,重金属含量低于国家一类海水水质标准,不同站位间所有重金属总和分布没有明显差异性；重金属元素间分布变化趋势存在一定的相关性；盐度、温度、pH、DOC、DO与重金属分布变化存在着比较显著的相关性规律.%During the investigation in the South China Sea in the autumn of 2010,the sea water samples were taken for some trace heavy metals(such as Cr、Cu、Pb、Zn、Cd and Pb) analyses from different layers of 16 stations.The heavy metals in seawater were determinated by inductively coupled plasma mass spectrometry (ICP-MS 7500ce) which had ISIS sampling system.The distribution of heavy metals in the south china sea water was investigated.Meanwhile,the Salinity、Temperature、pH、Dissolved Organic Carbon(DOC) and Dissolved Oxygen(DO) in the seawater were also mensurated,and the correlation of them with heavy metals was studied.It could be seen from the analytical results that the concentration of heavy metal was low and varied during a small range.Except Pb in some stations,the concentration values of Cu、Cr、Zn As and Pb did not exceed those of the First-Classed Seawater Quality Standard of China.The distribution of all heavy metals in different stations was in the similar way,and the varying trend during different heavy metals had obvious relativity,also,the Salinity、Temperature、pH、Dissolved Organic Carbon (DOC)and Dissolved Oxygen(DO) had more obvious regulation with the distribution of each heavy metal.