Spectrophotometric determination of critical micelle concentration of surfactants with dye indicators

965-966The absorbance of a series of mixtures of dye-surfactant solutions with dye concentration constant and increasing surfactant concentration has been measured. The λmax against surfactant concentration show either maximum or minimum corresponding to CMC of the surfactants which can be explained on the basis of micellisation and solubilisation or the formation of adsorption aggregates of dye surfactants