Diluent effects on synergism in extraction of uranium(VI)

Synergism in the extraction of uranium(VI) by a mixture of benzoyltrifluoracetone and antipyrine from benzene chloroform, hexane, cyclohexane and chlorobenzene media has been studied. The partition of antipyrine as well as its protonation has also been determined. The synergistic species changes from a monoadduct in the case of hexane, cyclohexane and benzene to a diadduct in the case of chloroform, whereas a mixture of mono- and di-adducts is obtained in chlorobenzene. A correlation of the nature of the species with the partition coefficient of antipyrine is observed as also between the partition coefficient and stability constant of the adduct with those of the participating ligands. (author)