Abstract
The capacity factors of phenylamine- and naphthylaminesulphonic acids in reversed-phase ion-pair liquid chromatography were measured. The equations log k′ = log k w − Sϕ 2 and log k′ = log k w + Aϕ 2_ Sϕ to describe the effects of methanol and acetonitrile concentration were compared. It has been observed that the effect of organic modifier concentration up to ϕ = 0 on retention follows the empirical equation log k′ = log k w − Sϕ. It was found that the effect of acetonitrile on retention is stronger than that of methanol, which is the same as the order of their elution strengths observed in RP-HPLC.
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