SELECTIVE EXTRACTION AND SPECTROPHOTOMERTRIC DETERMINATION OF VANADIUM (V) AS MIXED LIGAND COMPLEX WITH NHYROXY- N (2-METHYL) PHENYL N’ (4-FLUORO) PHENYLEXNZAMIDINE HYROCHLORIDE AND THIOCYANNATE

A novel extraction spectrophotometric method has been proposed for the determination of vanadium (v) using N-Hydroxyl–N-(2-Methyl) N'-(4-flouro) phenyl benza-amidinehydrochloride and thiocyarate HMPFBH reacts with vanadium in acidic medium to form 1:2 (metal ligand) blue-violet complex in chloroform. The absorption spectra consist of a flat peak in the range of 550-590 nm with molar absorbance 700± 20 mole-1 cm-1 when thiocynarate is added to this solution a marked increase in wave length of maximum absorbance is observed. On this basis a simple rapid and sensitive method has been developed for the determination of microgram quantities of vanadium in alloy steels. The ternarycomplex V(v) HMPFBH-SCN-absorbs strongly at 590nm with molar absorbance 6114 mole-1cm-1 and sandell sensitivity 8.34×10-3 The system obeys Beerls law in the range 1.6 pH to 3.2 pH. Ions like cl-, so42-, F- etc. Fe2+, C42+,CO2+,Ni2+ do not interfere in the determination. The method has been applied for the determination of vanadium in steel sample.