Titrimetric microdetermination of ruthenium(III) and rhodium(III)

Abstract

Titrimetric microdetermination of ruthenium (III) and rhodium(III) with ceric sulfate are described. Oxidation results in the formation of ruthenium(IV) and rhodium(IV). Remaining ceric sulfate solution is titrated against a standard solution of ferrous ammonium sulfate using N -phenyl anthranilic acid as indicator. Interference by cations has been observed in both cases. Range in which ruthenium and rhodium have been estimated vary from 0.3 to 16.6 mg/liter and from 0.19 to 11.7 mg/liter, respectively.