Abstract
Abstract Lithium isotope fractionation properties were studied on five kinds of inorganic ion exchangers with different ion-sieve properties. The lithium isotope separation factors were determined batchwise in a LiOH or (LiCl + LiOH) solution at 25 or 20°C, respectively. The separation factor increased in the order birnessite-type manganese oxide ≤ hollandite-type manganese oxide ≤ spinel-type manganese oxides ≤ cubic antimonic acid in the LiOH solution. It was dependent on the pore radius (r is) of the ion-sieve and was a maximum at r is = 0.10 nm. The difference in the separation factor with r is could be well explained by considering two factors; the difference in hydration circumstances of Li+ between the ion-exchanger and the solution phase, and the influence of Li+ stabilization in the solid phase.
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