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Determination of Anionic Surfactants in Real Systems Using 1,3-Didecyl-2-Methyl-Imidazolium-Tetraphenylborate as Sensing Material

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Abstract:

A new sensitive anionic surfactant sensor has been prepared, based on 1,3-didecyl-2-methyl-imidazolium-tetraphenylborate ion-exchange complexes as a sensing material incorporated into plasticized PVC-membranes. The sensor exhibited a Nernstian response (59.3 mV/decade) in the range of 4 × 10–7–5 × 10–3 mol/l for dodecylsulfate and a near-Nernstian response (57.8 mV/decade) in the range of 8 × 10–7–6 × 10–4 mol/l for dodecylbenzensulfonate. The main application of the sensor described was indication of the end-point in ion-pair surfactant potentiometric titrations. The sensor showed satisfactory analytical performances within a pH range of 2 to 12. The influence of the widely used types of nonionic surfactants on the determination of anionic surfactants was negligible if the mass ratio EONS:AS was not greater than 5. The sensor exhibits excellent selectivity performances for DS over almost all organic and inorganic anions investigated.

Keywords: ANIONIC SURFACTANT; ION SENSITIVE SENSOR; POTENTIOMETRIC TITRATION; PVC MEMBRANE

Document Type: Research Article

DOI: https://doi.org/10.1166/sl.2008.040

Publication date: 2008-04-01

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