Abstract
Distribution of Hg2+, Co2+, Sc3+ and Eu3+ between the cation exchanger Dowex-50X8, [H+] (100–200 mesh), and 1M HNO3 solution containing different benzylamine (BA) concentrations has been studied. The distribution coefficient, D, for Co2+, Sc3+ and Eu3+ is very small and does not vary seriously with the BA concentration. It is also found that Hg2+ is highly taken by the resin from the media studied. In this respect, D increases with increasing BA concentration to reach a maximum at 0.5% BA in 1M HNO3. This behaviour is explained by the exchange of molecular species between the cation exchanger and the aqueous phase. Based on the results, a radiochemical separation procedure for the selective isolation of Hg2+ from Co2+, Sc3+ and Eu3+ has been developed. The radiochemical purity is not less than 99.8% and the chemical yield more than 95% for the separated203Hg.
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