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

الملخص EN

-A 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