Extractive spectrophotometric determination of vanadium(V) using 2-(2-furyl)- 3-hydroxy-4 <i>H</i> -chromen-4-one

Abstract

Vanadium(V) forms a 1: 2 yellow complex with 2-(2-fury1)-3-hydroxy-4<em>H-chromen-</em>4-one in aqueous medium at 0.08-0.12 <em>M </em>CH₃COOH. The complex is extracted into chloroform and absorbs maximally at 410 nm, The absorbance remains constant for more than 18 h with molar absorptivity of 2.24 x 10⁴ 1 mol^-1 cm^-1. Beer's law is obeyed over the concentration range 0-4 <em>m</em><em>.g </em>V ml^-1. Sn(II), Mo(VI), ascorbic acid, oxalate and disodium EDTA interfere seriously. The method has been applied for the estimation of V(V)in high speed steel and reverberatory flue dust.