珠江河口及近海水体中铜的水平和形态分布

对夏季(2002-07)和冬季(2003-01)航次中珠江河口及近海水域样品中金属铜的总含量以及总溶解态、颗粒态、游离态铜含量进行对比分析。结果发现，夏季铜的总浓度水平分布并非完全体现陆源性规律，而是随河口向外海递增。而在冬季，总铜浓度的空间变化呈现和夏季完全相反的趋势，即随河口向外海逐渐降低。说明研究水域中金属铜可能具有其他来源，同时在很大程度上受到夏季沿岸上升流的影响。但是，游离态铜的分布在冬季和夏季却呈现相同的趋势，即自河口向外海逐渐降低。说明铜的形态分布在更大程度上取决于水体的理化性质。

Copper Speciation in the Pearl River Estuary and Its Bioavailability to Algae

The contents of total copper, particulate copper, and free copper ion in the samples obtained during the cruise in July 2002 and January 2003 in the Pearl River estuary are measured. It is found that, in summer, even though the total copper contents increase with salinity, the concentrations of free copper ion decrease with the salinity of water. On the contrary, the concentrations of total copper and free copper ion both decrease with salinity in winter. It can be concluded that, except the runoff from the river, there must be other sources of copper to the Pearl River estuary; and that the upwelling affects the copper contents and its speciation distribution heavily.