an improvement in purification of scandium through ion exchange chromatography is disclosed in which the oxidation potential of the eluting solution is altered by the addition of potassium chlorate or ammonium chloride so that removal of contaminants is encouraged . the temperature , ph and concentration of the eluent hedta are controlled in order to maintain the scandium in the column while minimizing dilution of the scandium band . recovery of scandium is improved by pumping dilute scandium over the column prior to stripping the scandium and precipitation . this eliminates the hedta ion and other monovalent cations contaminating the scandium band . this method maximizes recovery of scandium while maintaining purity .