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Abstract
The effects of ion-pair ions on the retention behavior of Ce and Th complexes on reversed-phase column have been studied. The results showed that the different retention behaviors of both two complexes would present when different types and concentration of ion-pair ions were studied. The ions studied were ammonium ion (NH4 +), tetramethyl ammonium ion(TMA+), tetraethyl ammonium ion (TEA+), and tetrabutyl ammonium ion(TBA+) Only TBA+ can be applied as ion-pair ion in the separation of Ce and Th complexes on reversed-phase column.