Cacotheline as a redox indicator in the determination of antimony(V), thallium(III), osmium(VIII) and iridium(IV) with iron(II)

Abstract

Cacotheline is proposed as a redox indicator in the determination of antimony(V), thallium(III), osmium(VIII) and iridium(IV) with iron(II) in an orthophosphoric acid medium. The proposed method was applied to the determination of antimony in tin- and lead-based white metal alloys and in antimony potassium tartrate. The method was extended to the analysis of binary thallium(III)-thallium(I) mixtures.