Chemiluminescent determination of vanadium in steel

Summary A chemiluminescent method for the determination of vanadium in steel with cinchomeronic hydrazide as analytical reagent is proposed. The optimum conditions are pH 11.75 (phosphate buffer), 1.0×10^–3 mol/l cinchomeronic hydrazide, 6.6×10^–3 mol/l hydrogen peroxide and 2.8×10^–3 mol/l V(IV). The maximum chemiluminescent emission is obtained at 420 nm. A linear relationship exists in the range of 0.04–1.00 g/ml of V(IV) with a 3.6% variation coefficient at 0.50 g/ml of V(IV) level for ten replicates. Cobalt(II), copper(II) and chromium(VI) show strong interference and a chloroform extraction procedure with -benzo-inoxime is recommended to avoid these interferences. This method has been applied to determine vanadium in a certified steel with excellent results.Presented at Euroanalysis VII