Peak Shape Distortions in the Capillary Electrophoretic Separations of Strong Electrolytes When the Background Electrolyte Contains Two Strong Electrolyte Co-Ions

摘要

A series of 25 mM phosphate buffer background electro- lytes were prepared from phosphoric acid and mixtures of lithium hydroxide and tetrabutylammonium hydroxide as pH adjusters and sources of background electrolyte co- ions. These background electrolytes were used for the capillary electrophoretic separation of quaternary am- monium analytes. Abnormally distorted peaks, different from the simple characteristic triangular peaks usually attributed to electromigration dispersion, were observed.