The redox chemistry of UCI, has been investigated in the solvent AICI3-I -ethyl-3-methylimidazolium chloride (AIC13-EMIC), a room-temperature ionic liquid. In basic solutions (

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The solvent extraction of heptavalent technetium from aqueous nitric acid by tri-n-butyl phosphate (TBP) has been studied over a wide range of TBP and HN0 3 concentrations at 25, 40, and 60° C. The extraction was found to proceed according to the reaction 3TBP+ H + + TcO, ^ [HTcO"· 3 TBP|. A discussion of possible extraction mechanisms is presented, along with values of AG, AH, AS, and Κ for the extraction reaction.

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Ru / Tri-n-butyl phosphate /Solvent extraction /Synergistic effect AbstractThe distribution of equilibrium mixtures of ruthenium(III) nitrosyl species between nitric acid solutions and tri-n-butyl phosphate (TBP)-n-dodecane (NDD) solutions has been studied. The influence of nitric acid concentration and the addition of various small anions (NO;, HSO;, CI", F", and C 2 OJ") to the aqueous phase on this distribution was investigated. The amount of ruthenium nitrosyl extracted into the organic phases reaches a maximum near 1 Μ HN0 3 in the absence of additional complexing or salting out reagents. Addition of a neutral nitrate salt (NaN0 3 ) increases the distribution coefficient. Addition of the sodium salts of HSOj, CI", and F" has little effect on the distribution, While the addition of oxalic acid substantially reduces the extraction of ruthenium nitrosyl into the organic phase. Di-nbutyl phosphate (DBP) exhibits a synergistic effect in combination with TBP, substantially increasing the ruthenium distribution coefficient.