ABSTRACT
For the separation of Indium (In) from accompanying elements anion and cation exchange resins of the strongly basic and acidic types are most frequently used. These resins are mainly employed in hydrochloric (HCl) and hydrobromic (HBr) acid media, but effective separations of In can also be performed in systems containing organic complex agents. Chelating resins have found only very limited application for separations involving In. Strong adsorption of In on basic resis takes place from solutions containing organic complexing agents as, for example, from tartaric and citric acid solutions of pH 2.5 to 3, malonic and ascorbic acid solutions of pH 4.5, 0.01 to 0.4 M oxalic acid and emylenediaminetetracetic acid (EDTA) solutions. While In is slightly retained on strongly and also weakly basic resins from very dilute sulfuric acid media, no adsorption of this element occurs from hydrofluoric (HF), nitric and perchloric acid media.
