Exthaktiv-Spekthophotometrische Bestimmung Von Rh(III) in Gegenwart Der Platinmetalle,Gold Und Silber Unter Anwendung Von 1-(2-Pyridylazo)-2-Naphthol

Abstract

A spectrophotometric method is described for the determination of 25–150μ;g of rhodium (III) using 1-(2-pyridylazo)-2-naphthol. One milligram of Ir(III) or Ir(IV), 200μ;g Ru(IV), 400μ;g Os(IV), 350μ;g Pt(IV), 5 mg Ag(I), and 100μ;g Au(III) do not interfere. Larger amounts of silver and gold are removed as AgCl and, after reduction with ascorbic acid, Au metal. A modification of the method permits the successive determination of 4–100μ;g of Hh(III) and 50–500μ;g of Pd(II) in a single sample.