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Preparation and Application of Cationic Surfactant Ion-selective Electrode

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Published/Copyright: August 16, 2013
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Abstract

In this study, a cationic surfactant ion-selective electrode was prepared; its performance was determined. The electrode showed good Nernstian response to some kinds of cationic surfactants and had lower detection limits (106 mol/L order of magnitude). Potentiometric titration was employed to determine the concentrations of three cationic surfactants (DDMBAC, CTAB, OTMAC) using the electrode as indicator electrode and sodium tetraphenylborate solution as titrant. The titration results were satisfactory compared with the two-phase titration method. The relative errors between the electrode and two-phase titration were 2.12 %, 3.45 %, and 4.21 %, respectively. In addition, the electrode was used to determine the critical micelle concentration of cetyl trimethyl ammonium bromide (CTAB) in organic solvent/water, and the CMC measured using the electrode method was nearly identical with that measured using the conductivity method.

Kurzfassung

In dieser Untersuchung wurde eine ionenselektive Kationentensidelektrode hergestellt. Ihre Leistungsfähigkeit wurde bestimmt. Die Elektrode hatte ein gutes Nernst'sches Anwortverhalten auf einige Kationentensidarten und niedrige Nachweisgrenzen (in der Größenordnung von 106 mol/L). Potentiometrische Titrationen wurden durchgeführt, um die Konzentrationen von drei kationischen Tensiden (DDMBAC, CTAB, OTMAC) zu bestimmen, wobei die Elektrode als Indikatorelektrode und Natriumtetraphenylborat als Titrant eingesetzt wurden. Die Titrationsergebnisse sind im Vergleich zur Zwei-Phasen-Titration zufriedenstellend. Die relativen Fehler zwischen der Titration mit der Elektrode und der Zwei-Phasen-Titration betrugen 3,12 %, 3,45 % und 4,21 %. Zusätzlich wurde die Elektrode zur Bestimmung der kritischen Mizellbildungskonzentration von Cetyltrimethylammoniumbromid (CTAB) in einer Mischung aus organischem Lösemittel und Wasser eingesetzt. Die mit der Elektrodenmethode erhaltene CMC war mit der nach der konduktometrischen Methode bestimmten CMC nahezu identisch.


* Correspondence address, Yuan Guang-yu, Enhanced Oil Recovery Institute, China University of Petroleum (Beijing), 18 Fuxue Road, Changping, Beijing, 102249, P. R. China, Tel.: 86-1 52 10 42 23 56, E-Mail:

Guang-yu Yuan, male, born in 1984, is a PhD candidate of China University of Petroleum and the main research areas include tertiary recovery, profile control, etc.

Ji-rui Hou is a professor of China University of Petroleum, and a doctor of Dalian University of Technology (2005). The main research areas include tertiary recovery, profile control, etc.

Bi-xin Liu is now working at SINOPEC Research Institute of Petroleum Processing (RIPP), a doctor of engineering from China University of Petroleum and the main research areas include tertiary recovery, profile control, etc.

Ye-yuan Luo is a master of science from China Research Institute of Daily Chemical Industry, engaged in physical and chemical properties of surfactant.


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Received: 2012-8-29
Published Online: 2013-08-16
Published in Print: 2013-05-15

© 2013, Carl Hanser Verlag, Munchen

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