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Potentiometric analysis of ionic surfactants by a new type of ion-selective electrode

par Kauffmann, Jean-Michel ;Gerlache, Marc;Senturk, Zühre;Viré, Jean-Claude
Référence Analytica Chimica Acta, 349, 1-3, page (59-65)
Publication Publié, 1997

Article révisé par les pairs

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Résumé :

A new type of ion-selective electrode for the determination of ionic surfactants is presented. It can be exploited as end-point indicator with a high sensitivity in potentiometric titration of surfactants and for direct potentiometric measurements in an online flow system. The electrode consisted of an ion pair between sodium laurylsulphate and 1,3-didecyl-2-methyl-imidazolium chloride, immobilized in a plasticized PVC membrane. This electrode gives a linear response for sodium lauryl sulphate between 2 x 10-6 and 5 x 10-3 M with, at 22°C, a slope of 58.9 mV per decade of SLS concentration. The electrode potential fluctuation is less than 1 mV. Application to the analysis of commercial detergent products has been realized and results have been compared with the two-phase titration method.