Studies of the Liquid-Liquid Partition Systems. III. The Solvent Extraction of Americium(III) and Europium(III) Thiocyanate Complexes with Tributylphosphate

Abstract

The two-phase distribution of americium(III) and europium (III) has been studied between the hexane solution of tributylphosphate (TBP) and the aqueous solution of sodium thiocyanate at 25°C. From the distribution data when the organic phase was 5% (by volume) TBP in hexane and the aqueous phase was 5 m Na(SCN, ClO4), the following equilibrium constants have been obtained by a least-squares method:(Remark: Graphics omitted.)A remarkable salting-out effect has been observed when sodium perchlorate is added to the aqueous phase. This salting-out effect has been discussed, as has the solvation number of TBP in the adduct complexes in the organic phase.