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Abstract
Cation-exchange chromatography of lithium was successfully carried out to investigate the lithium isotope effects in water-dimethyl sulphoxide (DMSO) mixed-solvent ion-exchange systems at 25°C. The value of the separation factor minus 1 (ε) was 1.4 · 10 −3 to 2.2 · 10 −3; ε had a maximum value of 2.2 · 10 −3 when the molar fraction of water in the solution phase, x water, was about 0.57, and decreased as x water deviated from this value. A consideration based on a theory of isotope distribution between two phases indicated that DMSO was slightly preferentially fractionated into the ion-exchange phase rather than into the solution phase.
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