Abstract
A substitution method in which phenolphthalein is displaced from the β-cyclodextrin cavity by the hydrocarbon moiety of a surfactant is used to determine the concentration of the surfactant. The 1:1 complex of phenolphthalein with β-cyclodextrin has an absorbance practically equal to zero in the region of the 550-nm band of the basic form of phenolphthalein. When solute molecules containing an alkyl moiety displace some of the phenolphthalein at a pH of approximately 10.5, the absorbance at 550 nm is significantly increased and serve as a direct measure of the concentration of the solute. The method is useful in determining concentrations of surfactants such as sodium dodecyl sulfate and N, N-dimethyl- N-dodecylamine oxide, which do not contain chromophores.
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