Simultaneous second-order analogue derivative spectrophotometric determination of vanadium and cobalt in steels

Abstract

A method is proposed for the simultaneous determination of vanadium and cobalt by second-derivative spectrophotometry based on their reactions with 4-(1′H-1′,2′,4′-triazol-3′-ylazo)-2-methylresorcinol. The method allows the determination of 0.10–1.02 p.p.m. of vanadium and 0.12–1.18 p.p.m. of cobalt in mixtures for which 10 ⩽C_V/C_Co⩽ 0.2 and it has been applied to their determination in alloy steels.