非水毛细管电泳分离过渡金属羧酸和羟基羧酸配位剂的比较

非水毛细管电泳分离过渡金属羧酸和羟基羧酸配位剂的比较屈锋;林金明
【期刊名称】《色谱》
【年(卷),期】2004(22)4
【摘要】@@ Many papers have been published on the analysis of metal cations by capillary electrophoresis (CE), for example, lanthanide, transition metal, alkali, and alkaline earth metal ions. Separations of metal ions are based on the differences in their electrophoretic mobilities. Since most metal ions having identical charge and size give rise to identical electrophoretic mobilities, the direct electrophoretic separation of these ions is impossible. However, their mobilities can be modified by introducing chemical equilibria in which the ions are involved in forming complexes. If metal ions have different complex formation constants, their apparent electrophoretic mobilities differ. The separation process is mainly carried out by using various weak complexing agents[1-4], which complex the metal ions to different extents. The weak complexing agents for metal ion separation primarily are hydroxycarboxylic acids with hydroxyl and carboxyl groups. In addition, organic solvents have also been added into the electrolytes to improve the selectivity of metal ion separation. When a metal ion interacts with polar solvent molecules through ion-dipole bonds, a solvation shell may be formed around the central ion. In principle, the solvent solvates all kinds of ions in solution, some to a greater extent than
others, depending on the specific properties of the central ion regarding a certain solvent. The use of pure nonaqueous systems offers potential for adjustment of relative migration rates via changes in solvent-ion interaction. Evidence for such analyte-electrolyte interaction has been reported for the separations of inorganic anions[5] and alkali, alkaline earth and transition metal ions in pure nonaqueous systems[6-8].
【总页数】3页(P372-374)
【作者】屈锋;林金明
【作者单位】Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing 100085, China;Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing 100085, China
【正文语种】中文
【中图分类】O658
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