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Two-Phase Titration Method for Cationic Surface Active Agents Determination with Use of 5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium Perchlorate Dye

Zweiphasentitration zur Bestimmung von kationischen Tensiden mit dem Farbstoff 5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinoliniumperchlorat
M. Gąsiorowska and E. K. Wróblewska
From the journal Tenside Surfactants Detergents
https://doi.org/10.3139/113.110160

Abstract

The direct two-phase titration method with use of solvatochromic dye, i. e. 5-(3-bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate (1) for cationic surfactants determination is presented which is the modification of an earlier described procedure for anionic surface active substances detection. The method was tested on standard solution of benzethonium chloride (cationic detergent) which enables to estimate its accuracy as well as on few commercially available products to verify its utility. The influence of pH value of the probe on the titration endpoint determination was discussed and a simple solution of this problem has been proposed.

Kurzfassung

Die direkte Zweiphasentitration zur Bestimmung von kationischen Tensiden unter Einsatz des solvatochromen Farbstoffs 5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo [1,2-a]quinoliniumperchlorat (1) wird präsentiert. Es handelt sich um eine Modifikation der schon früher für die Bestimmung anionischer Tenside beschriebenen Methode. Die Genauigkeit der Methode wurde mit Standardlösungen aus Benzethoniumchlorid (einem kationischen Tensid) getestet. An kommerziell erhältlichen Produkten wurde die Anwendbarkeit der Methode geprüft. Der Einfluss des pH-Werts der Probe auf den Titrationsendpunkt wurde diskutiert und eine einfache Lösung des Problems wurde vorgeschlagen.

Keywords: Cationic surfactant; surface active agent; titration; solvatochromic dye; indicator
Schlüsselwörter: Kationisches Tensid; grenzflächenaktives Mittel; Titration; solvatochromer Farbstoff; Indikator
∗ Correspondence to Dr. Monika Gąsiorowska, Department of Instrumental Analysis, Institute of Chemistry and Environmental Protection, West Pomeranian University of Technology, Szczecin, Av. Piastów 42, 71-065 Szczecin, Poland, E-Mail:

Dr. Eng. Monika Gąsiorowska was born in January 1975. She completed her Post Graduation in 1999, and her Ph. D. in 2005 at Technological University of Szczecin. At present she works as Assistant Professor at West Pomeranian University of Technology, Szczecin, Faculty of Chemical Technology and Engineering, Department of Instrumental Analysis as well as Head of Laboratory of General Chemistry.

Dr. Eng. Elwira Katarzyna Wróblewska was born in May 1972. She completed her Post Graduation in 1998, and her Ph. D. in 2002 at Technological University of Szczecin. At present she works as Assistant Professor at West Pomeranian University of Technology, Szczecin, Faculty of Chemical Technology and Engineering, Department of Instrumental Analysis.

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Received: 2011-07-28
Published Online: 2013-05-18
Published in Print: 2012-01-01

© 2012, Carl Hanser Verlag, München

From the journal
Tenside Surfactants Detergents
Tenside Surfactants Detergents
Volume 49 Issue 1

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