Abstract
Ion-exchange chromatography of rubidium was carried out to study the rubidium isotope effect in aqueous ion-exchange systems. The heavier isotope 87Rb was found to be preferentially fractionated into the resin phase. This trend is independent of the type of the resin (strongly acidic vs. weakly acidic), the kind of rubidium salts (rubibidum chloride vs. rubidium lactate) and the operating temperature (25°C vs. 70°C). The effect of ion association in and out of the resin phase on the single-stage separation factor is discussed.
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