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本文采用物理涂汞电极阳极溶出伏安法测定了中国南海北部海水中铅的表观络合容量为0.7～9×10~(-8)M。实验数据表明,南海北部海水中铅的络合容量比黄河口海水及青岛海水的络合容量稍大。铅可以和南海海水中的可溶性有机配位体形成稳定的螫合物。水柱的络合容量变化规律为表层最大,向下逐渐减小。此趋势同Romankevich 调查的世界三大洋溶解有机碳的垂直分布一致。
In this paper, the apparent concentration of Pb in seawater from the northern South China Sea was measured by anodic stripping voltammetry using a physical mercury electrode as 0.7-9 × 10-8 M. Experimental data show that the complexing capacity of lead in the northern South China Sea is slightly larger than that of the Yellow River estuary and Qingdao seawater. Lead can form stable complexes with soluble organic ligands in seawater from the South China Sea. The change law of water column complex capacity is the maximum of the surface layer and decreases downward gradually. This trend is consistent with the vertical distribution of dissolved organic carbon in the three oceans in the world as investigated by Romankevich.