التقدير الطيفي لأيون الكوبلت (ii)‎ باستخدام الكاشف العضوي 2-(3-برومو فنيل ازو)‎-4،-5 ثنائي فنيل اميدازول

الملخص EN

2-(3-Bromophenylazo)-4-5-diimidazol (3-BrPAI) has been synthesized, and used for the spectrophotometric determination of microgram amounts of cobalt (II).

This method, simple, sensitive and rapid for reaction between Co+2 and (3-BrPAI) to form complex having molar ratio of 1:2 ( Co – 3-BrPAI) at pH = 5 .

The Molar Absorptivity of the complex is (9359.470 l.mol-1 .cm-1 ) at λ = 445 nm .

Beers’s law is obey in the range of 0.1 – 6.5 ppm.

, detection limit D.L = 0.056 ppm and the stability was found to be 70407 x 10 ٩ L2 .mole -2 .

The relative standard deviation, recovery and relative error were estimated for the (3 ppm ) standard solution of cobalt (II), and were found to be 0.126 , -0.750 , 99.25 receptively.

The most important interference’s were due to Ag+ , Hg+2 ,Zn+2 , Ni+2 ,Cd+2 , Pd+2 .

were studied , and suitable masking agents were used the method was applied for determination of cobalt in the serum of human blood and the results obtained were compared with flame atomic absorption method .