Abstract
The separation potential, hydrostatic pressure and an auxiliary electroosmotic pump can all affect the migration time of an analyte in a capillary electrophoretic system. We report here a systematic study of the effects of variations in these parameters upon practical ionic separations, especially as applied to a suppressed conductometric capillary electrophoretic separation system (SuCCESS). Under conditions that are held constant during a run, auxiliary electroosmotic pumping generally produces the best results. When the parameter is changed during the run in a manner reminiscent of gradient elution in chromatography, under the optimum condition for each, gradient separation potential and auxiliary electroosmotic pumping produces comparable results except for late-eluting ions for which the latter technique clearly yields higher efficiencies.
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