用离子交换/ICP-AES联用技术研究溶液中配合铝的形态及分布

Studies on Distribution of Al Species Using Ion-exchange Microcolumn Combined with ICP-AES

以阳离子交换微柱分离与 ICP-AES检测联用技术为分离 /检测手段 ,系统地研究了不同配体配合物体系中铝的形态及其分布 .当 p H=6 .0时 ,溶液中非稳定态单核铝被微柱所保留 ,而稳定态配合铝直接从微柱中流出 .所选择的研究体系分别为 :Al-氟化物 (Al-Fluoride) ,Al-磷酸盐 (Al-Phosphate) ,Al-柠檬酸盐(Al-Citrate) ,Al-草酸盐 (Al-Oxalate)及 Al-EDTA.在确定的 p H值条件下 ,研究了不同的摩尔比 [n(Al) /n(配合剂 ) ]对铝的形态分布的影响 ,得到了一些对实际应用有指导意义的规律性结论 .

The distributions of Al species in different Al-ligands solutions were studied systematically by using a microcolumn packed with weakly acidic cation-exchange resins coupled with ICP-AES. At pH=6\^0, all labile monomeric Al species were retained on the microcolumn while non-labile monomeric Al species were directly passed through the column. The Al-ligands systems studied include Al-fluoride, Al-phosphate, Al-citrate, Al-oxalate and Al-EDTA. The effects of different Al-to-ligand molar ratios on the speciation were studied at a certain pH value, and some practised rules were obtained.