Abstract
The electrophoretic behavior of ten organic acids and four bases as model samples in water-methanol and water-ethanol has been studied with respect to the organic solvent concentration in the supporting electrolyte and its pH. The changes of the permittivity of the solvent influence the absolute velocity of migration as well as the relative effective mobility (via changes in p K a). Using theaelectrophoretic data, p K a values of the observed substances in mixed solvents have been approximated. Some separations of barbiturates in aqueous ethanol are presented.
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