Fundamental Studies on the Ion Exchange Separation of Isotopes, (VIII)

The breakthrough experiments of U(IV) and U(VI) have been done through an anion exchange resin column of 100 cm height and 1.2 cm diameter with 8N-hydrochloric acid.Uranous ions gave better separation factor (0.9993) than uranyl ions (1.0000) just as in the case of cation exchange resin reported in the previous paper. The mixed solutions of uranous and uranyl ions gave much favorite separation factors (0.99920.9986), which can be explained by effective contribution of the isotope effect of electron-exchange reaction.235U(VI)+238U(IV)_??_238U(VI)+235U(IV)The whole experimental results agreed with the theoretical values derived from the following fundamental equation by assuming ke=1.002.ln S238235(U)=ln S2+ln{1+S1keS2-1-1/1+ρ}+ln{1+(ke-1-1)/1+ρ}where S1 is the separation factor with the system containing only uranous ions, S2 is for uranyl; ρ and ρ are the ratios of uranyl ions to uranous ions in the solution and in the exchanger resin, respectively.