USE OF THE AQUEOUS BIPHASIC DIANTIPYRYLMETHANE-2-NAPHTHALENESULFONIC ACID SYSTEM FOR THE EXTRACTION OF SOME METAL-IONS

Phase equilibria in the water-diantipyrylmethane-2-naphthalenesulfonic acid system were studied by physicochemical analysis. The region of a two-phase liquid-liquid equilibrium was found in which phase separati on is caused by protolytic interactions between components, The distri bution of Sc, Fe(III), Hf, Zr, Bi, In, Mo(VI), U(VI), Th, and Ga betwe en the phases was studied, Optimal conditions were found for their pre concentration and extract-ion from solutions of different salt composi tion. The composition of some extracted complexes was revealed and the chemical mechanism of extraction is suggested. A procedure for the ex traction-photometric determination of iron in alloys is proposed.