Selective extraction and determination of scandium in industrial waste (matte) by the complexometric method

In this article, selective extraction and complexometric titration of scandium waste (waste matte) are investigated. Waste matte contains various ions of elements As, Pb, Sb, K, Hg, Fe, Ca, Au, Cd, Na, Si that interfere with the determination of scandium. In a moderately acidic medium, scandium ions form a mixed complex with diantipyrylmethane in the presence of iodide ions, which is well soluble in chloroform. Under these conditions, lanthanides as well as As, Pb, Sb, K, Hg, Fe, Ca, Au, Cd, Na do not form compounds soluble in chloroform and do not interfere with the determination of scandium. Scandium is reextracted with an ammonia solution of EDTA and the determination is completed complexometrically.