Spectrophtometric determination of Resorcinol in aqueous solutions and some Bulk Samples by coupling with Diazotized 4- Methoxy aniline


A simple, rapid and sensitive spectrophotometric method for determination of microgramamounts of Resorcinol in aqueous solution and some bulk samples was described.The method isbased on a diazotization and coupling reaction between resorcinol and diazotized 4-bromo Methoxyaniline in basic medium to form an intense brown water-soluble dye that is stable, which showsmaximum absorption at 448nm. Beer’s law is obeyed over the concentration range of(0.4-4.4)μg.ml-1 of resorcinol , with a molar absorptivity of 2.7844×104 l mol-1 cm-1, and Sandell sensitivityindex of 0.0039 μg/cm2 The method does not resort to temperature control or to solvent extraction.The optimum conditions for all colour development are described and proposed methods weresuccessfully applied to the determination of resorcinol in aqueous solution and some bulk samples.