Derivative spectrophotometric methods for the determination of rhodium, palladium and platinum in mixtures

Derivative spectrophotometric methods allowing direct determination of rhod ium, palladium and platinum in binary mixtures have been developed. The com plexes of the metals with tin(II) chloride make the basis of spectrophotome tric measurement. The determination of the metals can be carried out in aqu eous solutions or after extraction into 1,2-dichloroethane in the form of t he ion-associates Rh(Pd, Pt)-SnCl3-diantipirylmethane (DAM). Palladium and platinum in spent autocatalyst have been determined by the developed method s.