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Abstract
A systematic study on the isotope fractionation occurred in the isotopic exchange reaction has been carried out by means of ion exchange chromatography using uranyl-carboxylate complex formation reactions. On a cation exchange resin column, an isotopic plateau holding displacement chromatogram has been performed and the magnitudes of the isotope effects have been determined for the three cases of uranyl-carboxylate, uranyl-acetate, uranyl-tartrate and uranyl-citrate. The elemental separation coefficients were found to be 0.8 × 10−4 for acetate ligand, 1.2 × 10−4 for tartrate ligand and 1.8 × 10−4 for citrate ligand. The enrichment of 235U in relation to 238U was observed in the uranyl-carboxylate complexes in all times.