A conductometric sensor specific for cationic surfactants

Abstract : In this work, a fast, sensitive and miniaturised conductometric sensor based on interdigitated electrodes, working in differential mode, was developed for the determination of cationic surfactants. The membrane was composed of a polymer (PVC), a plasticizer (dinonylphtalate (DNP)) and a carrier (sodium tetraphenylborate (NaBF4)). The sensor response was linear from at least 10-9 M to 10-2 M for dodecyltrimethylammonium (DTA+). No significant loss of sensor response was observed after 8 weeks. The sensor exhibited a lower sensitivity and a narrower dynamic range for tetrabutylammonium, decyltrimethylammonium and cetyltrimethylammonium cationic surfactants. A ten times lower sensitivity was observed for laurylsulfate anionic surfactant, (LS-).
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Submitted on : Monday, April 29, 2013 - 3:21:15 PM
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Mouna Hnaien, Sergei Dzyadevych, Florence Lagarde, Nicole Jaffrezic-Renault. A conductometric sensor specific for cationic surfactants. Electroanalysis, Wiley-VCH Verlag, 2012, 24 (6), pp.1441-1445. ⟨10.1002/elan.201200055⟩. ⟨hal-00818898⟩

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