A spectrophotometric and first derivative spectrophotometric determination of cobalt(II) is carried out with 1-(2 Pyridylazo)-2-Naphthol as complexing reagent in aqueous phase using non-ionic surfactant Tween 80. The cobalt is determined in the range 1.7-225ng ml-1 with detection limit (2α) of 1.7ng ml-1. The molar adsorptivity and Sandell’s sensitivity are 0.87 x (104 mol-1cm-1) and 6.8ngcm-2 at 580nm. The optimum pH of complex is 5. The critical micelle concentration (cmc) of Tween 80 is 5%. Adsorption studies in the first derivative mode is carried out to determine the adsorption maximum of the complex and to overcome interference due to the presence of certain metal ions. The presents methods is compared with that of AAS and no significant difference is noted between the two methods at 95% confidence level. The method has been applied for the determination of Co (II) in pharmaceutical samples.
G A SHAR ,G A SOOMRO ,
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