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Surfactant to Dye Binding Degree-Based Methodology for the Determination of Ionic Amphiphilic Compounds

2003; American Chemical Society; Volume: 75; Issue: 21 Linguagem: Inglês

10.1021/ac030105v

1520-6882

Rafael Fabios, María Dolores Sicilia, Soledad Rubio, Dolores Pérez‐Bendito,

Analytical chemistry methods development

A new analytical measurement parameter based on the effect of amphiphilic substances on the degree of binding of a surfactant to dye molecules, which induce the formation of surfactant premicellar aggregates, is presented. The theory for dye-surfactant intermolecular interactions in mixed surfactant systems, which assumes a mononuclear model for the formation of dye-induced premicellar aggregates, has been used to derive an expression that provides linear calibrations for the determination of amphiphilic compounds. The dye-surfactant interactions involved have been investigated, and the variables affecting the measurement analytical parameter have been discussed. The analytical applicability of the surfactant-dye binding degree method is demonstrated by quantifying major anionic surfactants at the nanograms-per-milliliter level and determining the total concentration of these amphiphilic substances in sewage samples (average recoveries ranged from 98 to 102%).