Determination of the separation factor of lithium isotopes in ion exchange

The isotopic equilibrium between the solutions of lithium salts (LiOH and LiCl) and SBS, KU-2, and Dowex-50 cationites is investigated. It is shown that, in the first place, the Li⁷ isotope was concentrated in the solution in all the cases which were investigated; in the second place, there is a dependence of the separation factor value on the nature of the cationite; in the third place, in 1 N to 5 N solutions of LiCl, the value of a does not depend on the concentration of the solution.In conclusion, we extend our sincere thanks to Professor G. K. Boreskov for his advice and continued interest in the work.     

Separation of boron isotopes using isotopic exchange between BF3 and a complex of BF3 with phenetole

The thermal dissociation of the complex of BF₃ with phenetole in the temperature region 172–182° C was studied. It was shown that at water concentrations no greater than 0.01–0.02%, the completeness of thermal dissocation is sufficient to obtain highly concentrated B¹⁰. The influence of additions of phenol, which also forms a complex with BF₃, upon thermal dissociation of the complex was studied. Experiments on the separation of boron isotopes were conducted on a laboratory column 0.94 m high and 16 mm in diameter. The values of BETT for 15, 25, and 35° C were calculated according to the degree of dissociation in the standard state. The results of the experiments on a laboratory column confirmed the data on thermal dissociation, obtained on a model apparatus.Translated from Atomnaya Énergiya, Vol.22, No.4, pp.297–302, April. 1967.