Abstract
The distribution of uranium(IV) between hydrochloric acid solutions and solutions of di-(2-ethylhexyl)-phosphoric acid (HDEHPA) in carbon tetrachloride has been investigated at different concentrations of hydrochloric acid, extractant and uranium. In moderately acidic solutions ( C HCl < 2·7M) uranium(IV) is extracted as U(DEHPA) 4 and from more acidic solutions ( C HCl 2·7–7·0M), as the mixed complex UCl 2(DEHPA) 2. At still higher HCl concentrations, viz. C HCl > 7·0M, there is an evidence of a solvation mechanism involving the extraction of solvated uranium complexes. The i.r. absorption spectra of uranium(IV) complexes in CCl 4 are also recorded and discussed.
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