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Abstract

Distribution of indium(III) and antimony(III) was examined between hydrochloric acid solutions and solutions of tri-n-butylphosphate (TBP), trialkyl- and triarylphosphine oxides (TGPO, G = phenyl (P), n-butyl (B), or n-octyl (O)), or tetra-n-butylammonium chloride (R₄NCl) in benzene or other organic solvents. The extractability of indium into benzene decreases in the order TOPO > TBPO > TBP ~ TPPO. In the case of TOPO and TBPO, there is a pronounced maximum on the plots of log D_In vs c(HCl) in the region of c(HCl) = 3-6 mol l^-1; this applies also to other organic solvents. The composition of the species transferred into the organic phase is probably HInCl₄.2 TGPO. The distribution ratio of antimony(III) attains considerable value even in the absence of the organophosphorus reagents, which indicates that Sb chloro complexes themselves are extracted.