Abstract
Anew simple and rapid colorimetric method has been developed for the determination of benzidine in aqueous solutions. The method is based on the formation of a pink colored azo dye by diazotization of benzidine, followed by a diazo-coupling reaction between the resulting product and β-naphthol. The maximum absorbance of azo dye at 525 nm. Beer's law was found to be obeyed in the concentration range of 0 -12 µg . ml -1 with molar absorptivity 12360 L. mol -1 . cm -1 . The
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