The absorbances of the azo-hydrazone tautomer of sodium 4-(p-sulfonatophenylazo)-1-naphthol-2-sulfonate dissolved in an aqueous solution of polyethylene glycol octyl dodecyl ether (8ED) were measured in the presence of various concentrations of sodium dodecyl sulfate (SDS). The existence of a mixed micellar region of SDS and 8ED in the bulk solution was confirmed by this azo-hydrazone tautomer method.
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Meguro et al. (1983) studied this question.
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