Determination of cationic surfactants in pharmaceutical disinfectants using a new sensitive potentiometric sensor

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• 作者：Dubravka Madunić ; -Č ; ač ; ić ; Milan Sak-Bosnar ; Olivera Galović ; Nikola Sakač ; Ruž ; ica Mateš ; ić ; -Puač
• 关键词：Surfactant sensor ; PVC membrane ; Cationic surfactant ; Potentiometric titration ; Pharmaceuticals
• 刊名：Talanta
• 出版年：2008
• 出版时间：15 July 2008
• 年：2008
• 卷：76
• 期：2
• 页码：259-264
• 全文大小：387 K

文摘

A new sensitive potentiometric surfactant sensor was prepared based on a highly lipophilic 1,3-didecyl-2-methyl-imidazolium cation and a tetraphenylborate antagonist ion. This sensor was used as a sensing material and incorporated into the plasticized PVC-membrane. The sensor responded fast and showed a Nernstian response for investigated surfactant cations: cetylpyridinium chloride (CPC), hexadecyltrimethylammonium bromide (CTAB) and Hyamine with slope 59.8, 58.6 and 56.8 mV/decade, respectively. The sensor served as an end-point detector in ion-pair surfactant potentiometric titrations using sodium tetraphenylborate as titrant. Several technical grade cationic surfactants and a few commercial disinfectant products were also titrated, and the results were compared with those obtained from a two-phase standard titration method.