Abstract
Abstract The capacity factors of phenylamine and naphthylamine sulphonic acids in reversed-phase ion-pair liquid chromatography (RP-IPC) with different concentration of inorganic anions were measured. The capacity factors of ionic solutes decreases in the order NaF < NaBr < = NaNO3 < Na2SO4, which is the same as their order of anion retention values in anion ion chromatography. The good linear relationship between logarithm of capacity factors at different inorganic salt eluents were observed. The effect of salt concentration (Cs) on retention follows an equation based on the Gouy-Chapman model
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