Abstract
The extraction of the radionuclides 131barium and 140lanthanum from hydrochloric acid solution by means of the monooctyl ester of anilinobenzylphosphonic acid (MOABP) has been studied. Solutions of MOABP in three different solvents (petroleum ether, carbon tetrachloride and chloroform) were used as the organic phase and the influence of the solvents on the extraction of barium and lanthanum is discussed. It was found that lanthanum can be quantitatively extracted from certain hydrochloric acid solutions into the organic phase, whereas barium remains in the aqueous layer. A simple procedure for their separation is described. It can be carried out regardless of whether the metals are in dilute solution or in a carrier-free form. Barium chloride, even in high concentrations, does not influence the extraction of lanthanum. Lanthanum was re-extracted from the organic phase with 1 M hydrochloric acid. The purity of the separated lanthanum was checked by following its decay curve.
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