Ion-Association Extraction of Nitrobenzoate Ions with Tetrabutylammonium Ion into Nonionic Surfactant Micelles as Studied by Capillary Zone Electrophoresis

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Ion-associates formed between tetrabutylammonium ion (TBA+) and substituted nitrobenzoate ions have been extracted into nonionic surfactant micelles in an aqueous solution. The micelle extraction property of the ion-associates was investigated through the changes in electrophoretic mobility in capillary zone electrophoresis, in which a nonionic surfactant, Brij 35 or Brij 58, was used as a micelle substrate. Prior to the extraction analysis, ion-association constants (Kass) between TBA+ and the benzoate ions as well as binding constants of the anions to the nonionic surfactant micelle (KB) were determined through the mobility change. Binding of the ion-associates from aqueous to the micelle phases was observed, when both TBA+ and the nonionic surfactant were present in the migrating solution. Micelle extraction constants for the ion-associates (Kex,m), were also determined by using the mobility change, and the values were compared with the ion-association solvent extraction constants between water and chloroform.

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