浙江西沪港重金属铜的配位容量和形态分析

Investigation of heavy metal copper complexing capacity and forms in the Xihu Harbour of Zhejiang, China

根据2000年6月10～14日在浙江省西沪港采集的海水样品,利用AA-800石墨炉原子吸收分光光度技术和阳极溶出伏安法测定样品中重金属铜的含量,获得铜在海水中受不同的有机配体控制。不同粒级的铜表观配位容量表明西沪港海水过孔径1.00μm微孔膜的(ACuCC)较高,为144.4nmol/dm^3;过0.40和0.20μm滤膜的(ACuCC)分别为103.0和102nmol/dm^3;铜的有机配体条件稳定常数的对数值在7.25～9.14之间。铜的总量为21.72nmol/dm^3。铜全部为稳定溶解态,其中pH2酸溶态占95.0％,强有机结合态占5.0％.溶解态铜中有机结合态占过滤海水中总铜的61.6％。

Based on the seawater samples collected from the Xihu Harbour of Zhejiang, China on June 10~ 14, 2000, AA - 800 graphite furnace atomic absorption spectrophotometer (AAS) and anodic stripping voltammetry (ASV) were used to determine the content of heavy metal copper in the samples and acquire that copper in seawater is controlled by different organic complexes. Compared with different particle sizes (1.00, 0.40, 0.20 um), the apparent copper complexation capacity (ACuCC) is respectively 144.4, 103.0 and 102.0 nmol/dm3;the conditional stability constants logarithm of copper organic ligand is respectively 9.14, 8.66 and 7.25. Total copper (21.72 nmol/ dm3) in the Xihu Harbour is higher. Copper all is steady dissolved, including pH2 acid dissolved copper 95.0 % and organic high complexing copper 5.0% . Dissolved organic complexing copper accounts for 61.6% of total copper in filtered seawater.