Abstract
The liquid-liquid extraction behaviour of Eu(II) into solutions of acidic phosphoric and phosphonic esters has been investigated both on a macro-scale and tracer-scale. The distribution ratio of Eu(II) was investigated as a function of extractant concentration in the organic phase and HCl concentration in the aqueous phase using β-active 13, 16 year 152, 154Eu. Advantage was taken of the large separation factors Pm(III)/Eu(II), Sm(III)/Eu(II), and Gd(III)/Eu(II) in effecting the mutual separation of 147Pm and 152, 154Eu, the high purification of 147Pm with respect to 152, 154Eu, and the enrichment, concentration and recovery in high yield of europium from a rare earth oxide containing 0·1 per cent Eu.
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