Extraction chromatography of indium with trioctyl phosphine oxide

Indium is extracted on the silica gel column coated with trioctylphosphine oxide, as the stationary phase from 2-6M hydrochloric acid. It is stripped from the column with 0.01-1 M HCl of H2SO4. Employing this stationary phase indium has been separated from a large number of other metal ions either commonly associated with it or forming part of the alloy containing indium. The separation of indium from gallium, thallium and aluminium is significant. (author)