Extractive Spectrophotometric Determination Of V (V) By Using 2-Hydroxy-3-Methoxy Benzaldehyde Thiosemicarbazone As An Analytical Reagent.

2-Hydroxy-3-methoxy benzaldehyde thio semicarbazone (2H3MBTS) is proposed as a new photometric reagent for the extractive spectrophotometric determination of V(V) (2H3MBTS) reacts with V (V) and form a stable  colored complex in the pH range 6.2 to 7.6. This was well extracted in n-butanol. The absorption     spectrum of V (V) and (2H3MBTS) complex in n- butanol shows maximum absorbance at 390 nm. The system obeyed Beer’s law up to 1-8 µg / cm³. The molar extinction coefficient was found to be 18.20×10²L mol^-1cm^-1 and the sensitivity of the method as defined  by  Sandell’s sensitivity  was 0.02797µg cm^-2. The Composition of the extracted species was determined by Job’s Continuous  variation  method, Mole ratio method        and slope ratio method and it was found to be 1:2. The proposed reagent is satisfactorily applied for the determination of trace amount of V (V) from synthetic and commercial samples.