K. Ooi et al., LITHIUM ISOTOPE FRACTIONATIONS ON INORGANIC ION-EXCHANGERS WITH DIFFERENT ION-SIEVE PROPERTIES, Separation science and technology, 30(20), 1995, pp. 3761-3770
Lithium isotope fractionation properties were studied on five kinds of
inorganic ion exchangers with different ion-sieve properties. The lit
hium isotope separation factors were determined batchwise in a LIOH or
(LiCl + LiOH) solution at 25 or 20 degrees C, respectively. The separ
ation 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 rad
ius (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 explaine
d by considering two factors; the difference in hydration circumstance
s of Li+ between the ion-exchanger and the solution phase, and the inf
luence of Li+ stabilization in the solid phase.