Spectrophotometric determination of vanadium in glass and ceramics after extraction of the vanadium—salicylhydroxamic acid complex on polyurethane foam

Abstract

A simple spectrophotomeric method was developed for the determination of traces of vanadium present in glass and ceramic raw materials. The method involves the formation of a vanadium-salicylhydroxamic acid complex in 1 M HF-H 2SO 4 medium, followed by extraction of polyether-based polyurethane foam and elution of the complex with acidified acetone (9.5 ml of acetone + 0.5 ml of 1 M HCl) for spectrophotomeric measurement at 520 nm. The method obeys Beer's law from 0.5 to μg V ml −1. The molar absorptivity was calculated to be 6.9 x 10 3 mol 1 −1 cm −1 at 520 nm. Interferences from other metals, viz., Fe, Co, Mo, Zr, Hf and Ti, were eliminated by using HF medium. The method was applied to several glass and ceramic samples.