Abstract
The microphase adsorption–spectral correction (MPASC) technique was applied to the interaction of thioin (TN) with sodium dodecyl sulfate (SDS) at pH 4.56. The synergism mechanism of SDS in solution was analyzed and discussed. The great electrostatic aggregation of TN on SDS obeys Langmuir monolayer adsorption. The property constants of the aggregate were determined and the quantitative determination of the anionic surfactant (AS) in samples was made in the presence of EDTA. Results showed that the large micellar aggregate is (TN–SDS2)31, the adsorption constant of the monomer aggregate is 1.85 × 105 (18°C), and its molar absorptivity is 4.45 × 106 L mol–1 cm–1. For analysis of samples, the recovery is between 94.5 and 111% and the RSD is less than 7.62%.
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