Anion-exchange chromatography of mixed cyano complexes: separation and determination of dicyanoaurate(I)

Abstract

Two eluent systems are described for the separation and determination of gold and other metal cyano complexes. The elution order of the cyano species was dependent on the sodium perchlorate concentration. Greater ionic column selectivity for gold was achieved with an eluent containing ammonia. The complexes were detected spectrophotometrically at 215 nm. The detection limit for gold is 5 µg dm^–3 using direct injection.