Abstract
Relationships between RM values and pH of aqueous stationary phase were determined for some heterocyclic bases and their N-oxides chromatographed in partition systems of the type: organic solvent (benzene, chloroform or mixture of chloroform with cyclohexane)—aqueous buffer solution. In view of large differences in pKA values of the bases and their N-oxides, the ΔRMro(N→NO) values (change of RM during suppressed ionization, due to reaction) could only be estimated by graphical extrapolation of the chromatographic data. The ΔRMro values thus determined were in most cases in the range 2.2–2.7 RM units.
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