Abstract
A selective, sensitive and direct method for the spectrophotometric determination of vanadium in steels is developed in which vanadium is extracted withN-phenyl benzohydroxamic acid (PBHA) into chloroform from 5M hydrochloric acid medium followed by colour development by addition of 4-(2-pyridylazo)resorcinol (PAR) inN,N-dimethyl formamide (DMF). The vanadium(V)-PBHA-PAR mixed ligand complex shows maximum absorbance at 560 nm with a molar absorptivity 3.6 × 104 l mol−1 cm−1 and obeys Beer's law up to 2.0 μg/ml of vanadium. The composition of the mixed ligand complex is determined by Job's method of continuous variations which revealed a 1 ∶ 1 ∶ 1 ratio for V(V) ∶ PBHA ∶ PAR. This method can be directly applied for the determination of vanadium in steels, while in the case of titanium base alloys, after separation of titanium matrix it gives good results even at 50–200 μg of vanadium per gram level.
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