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ABSTRACT
The differences between the solvent extraction of Tb( III ) and Tb(IV) periodate complexes with quaternary amine were studied carefully for the fir6t time. The effects of extractant concentration, phase ratio, the pH value of stock solution, salting-out agent, extractant form, diluent, and extraction time were comprehensively investigated. Under optimal conditions the separation factor between Tb(IV) and Tb(III] periodate complexes is over 5.5.