Spectrophotometric determination of Vanadium using new analytical reagent 7-(6-bromo-2-benzothiazolylazo)-8-hydroxyquinoline


AbstractA new thiazolylazo reagent, 7-(6-bromo-2-benzothiazolylazo)-8-hydroxyquinoline (7-(6-BrBTA8HQ)), was synthesized by di azo coupling of (2-amino-6-bromobenzothiazol derivative) with 8-hydroxy quinoline, and used for the spectrophotometric determination of vanadium (V). This method was simple, rapid, sensitive, and selective for reaction between vanadium and 7-(6-BrBTA8HQ) to form a dark orange complex with a molar ratio (1:2).The molar absorptivity of the complex was (1.9737*103L. mol_.cm_) at λ max 634 nm. Beer's law obeyed in the range of (1-14)ppm of vanadium,and the stability constant was equal to (0.1088*1010 L2. Mol2-). The relative standard deviation,recovery, and relative error were equal to (0.631%,98%,2%) respectively. The ions ( Cr2+ ,Mn2+ , Cu2+ ,Cd2+ ,Fe2+ ,Ni2+ ,Co2+ ,Hg2+ ) were interferences when the reagent react with vanadium ,and can be eliminated approximately using suitable masking agent.