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ABSTRACT
The coextraction behavior of technetium(VII) and uranium(VI) from nitric acid solution by n-octyl(phenyl)-N,N-diisobutylcarbamoyl-methylphosphine oxide (CMPO) in the absence or presence of tributyl phosphate (TBP) was investigated. The extraction of technetium was re markably enhanced in the presence of uranium at less than 0.1M nitric acid concentration, and with the initial concentration ratio of [U] / [Tc] = 50 in the aqueous phase, the distribution coefficient of Tc(VII) at 0.01M nitric acid was about one hundred times greater than that obtained in the absence of uranium. The coextraction of technetium and uranium was presumed to occur due to the same ion exchange mechanism as reported in the Tc-U-TBP system. However, the effect of TBP on this coextraction was not observed in.the present study.
