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

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...

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Bibliographic Details
Published in:Analytica chimica acta 1997-08, Vol.349 (1), p.59-65
Main Authors: Gerlache, M., Sentürk, Z., Viré, J.C., Kauffmann, J.M.
Format: Article
Language:English
Subjects:
Detergent
Direct potentiometry
Ion-selective electrode
Ionic surfactant
Potentiometric titration
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Summary: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 × 10 −6 and 5 × 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.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(97)00277-8