On-line Preconcentration on pH Boundary – the Beauty of Capillary Electrophoresis

Page: 661

J. Petr, V. Maier, J. Znaleziona, K. Vítková, V. Ranc, and J. Ševčík

Department of Analytical Chemistry, Palacký University, Olomouc


The beauty of capillary electrophoresis is shown on preconcentration of some phenolics. The method is based on the electrokinetic injection of phenolics into a sodium borate electrolyte (pH 9.5) at the pH boundary formed by sodium phosphate (pH 2.5) followed by mobilization and separation by replacing the injection vial with the vial containing micellar environment. This technique allows determination of nanomolar concentrations of phenolics.


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