A Conductometric Sensor Specific for Cationic Surfactants |
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| Authors: | Mouna Hnaien Sergei Dzyadevych Florence Lagarde Nicole Jaffrezic‐Renault |
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| Affiliation: | 1. Université de Lyon, Lyon 1, Laboratoire des Sciences Analytiques, UMR 5180, CNRS, CPE, 43 bd du 11 novembre 1918, 69622 Villeurbanne cédex, France tel: +33472448306;2. fax: +33472431206;3. Laboratory of Biomolecular Electronics, Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine, 150 Zabolotnogo St., Kiev 03143, Ukraine |
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| 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 (NaBΦ4)). 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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| Keywords: | Conductometric sensor Interdigitated microelectrodes Cationic surfactants DTA+ detection |
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