Some studies on photometric determination of gallium in highly pure indium

TLDR: In this paper, the influence of the concentration of HCl on the extractability of gallium in the presence of Rhodamine B into a mixed solvent consisting of 6.5 volumes of benzene and 1 volume of methyl isobutyl ketone was examined.

Abstract: (1) When the absorption curves of Rhodamine B in 6 M HCl in the presence and in the absence of gallium were measured, no appreciable difference was detected. It may be reasonably concluded that gallium Rhodamine B complex dissociated almost completely in 6 M HCl. (2) The influence of the concentration of HCl on the extractability of gallium in the presence of Rhodamine B into a mixed solvent consisting of 6.5 volumes of benzene and 1 volume of methyl isobutyl ketone was examined. It was found that the extractability was the highest at 6 M HCl. (3) The value of distribution ratio of gallium between the mixed solvent and 6 M HCl was 14 and that between benzene and 6 M HCl was 0.56. (4) From the results of the measurements of the absorption curves of extracts and the extraction coefficients of indium it was concluded that interference of indium with the determination of gallium was caused by the fact that indium rhodamine B complex was extracted. into, the mixed solvent together with gallium Rhodamine B complex. (5) The distribution ratio of indium Rhodamine B complex between the mixed solvent and 6 M HCl was 29×10-2.