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A study on the separation of lithium isotopes was carried out with 1,13-dioxa-4,7,10-triazacyclopentadecane-4,7,10-trimerrifield peptide resin [N3023M ]. The resin having N302 as an anchor group has a capacity of 0.2 meq/g dry resin. Upon column chromatography [0.1 cm (I.D)x30 cm (height)] using 1.0M NHaCI solution as an eluent, a single separation factor of 1.00104 was obtained from the elution curve and isotope ratios based on the GLUECKAUF theory. The heavier isotope, 7Li concentrated in the resin phase, while the lighter isotope, 6Li enriched in the solution phase.

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The chromatographic separation of magnesium isotopes was investigated by chemical ion exchange with 1, 16-dithia-4,7,10,13-tetraazacyclooctadecane-4,7,10,13-tetramerrifield peptide resin[N4S2'4M ] synthesized recently. The capacity of novel NaS 2 azacrown ion exchanger was 0.34 meq/g dry resin. The heavier isotopes of magnesium concentrated in the resin phase, while the lighter isotopes are enriched in the solution phase. The glass ion exchange column used was 30 cm long with inner diameter of 0.2 cm, and the 1.0M NH4CI solution was used as an eluent. The separation factors of 24Mg-25Mg, 25Mg-26Mg, and 24Mg-26Mg were 1.047, 1007, and 1.008, respectively.

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