Startseite 5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium Perchlorate as a New Indicator for Anionic Surface Active Agents Determination
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5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium Perchlorate as a New Indicator for Anionic Surface Active Agents Determination

Part II. Influence of pH on the Titration Results
  • E. K. Wróblewska und M. Gąsiorowska
Veröffentlicht/Copyright: 11. April 2013
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Tenside Surfactants Detergents
Aus der Zeitschrift Tenside Surfactants Detergents Band 48 Heft 2

Abstract

The work refers to the already published modification of widely used method for anionic active agents determination which concerns the replacement of the mixed indicator, consisting of Acid Blue 1 and carcinogenic Dimidium Bromide, applied in the International Standard ISO 2271:1989 with solvatochromic dye i.e. 5-(3-bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate (1). The value of pKa for examined dye (1) amounts to 6.59 thus the influence of different pH values of the probes on the analysis results was studied i.e. precision of determination of titration endpoint and the same the result of the quantitative analysis. The change of pH for aqueous and apparent pH for organic phase were determined during the titration process. It was shown that there is no effect of the pH change in its range varying from 3.5 to 5 on the results. The modification of the method for the probes which pH do not fit to the range mentioned above is presented.

Kurzfassung

Diese Arbeit verweist auf die bereits veröffentlichte Modifikation der häufig eingesetzten Methode zur Bestimmung anionischer Tenside. Die Modifikation betrifft den Ersatz des Mischindikators aus dem karzinogenen Diimidiumbromid und Patentblau V, der in der internationalen Norm ISO 2271:1989 angewendet wird, gegen den solvatochromen 5-(3-bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate (1). Der pKa-Wert des untersuchten Farbstoffs (1) beträgt 6,59, weshalb der Einfluss verschiedener pH-Werte der Proben auf das Ergebnis der Analyse, d.h. auf die Genauigkeit der Endpunktbestimmung und die Reproduzierbarkeit des Analysenergebnisses, untersucht wurde. Die pH-Wertänderung in der wässrigen und die scheinbare Änderung in der organischen Phase wurden während des Titrationsprozesses bestimmt. Es konnte gezeigt werden, dass die pH-Wertänderung zwischen 3,5 und 5 keinen Effekt auf die Ergebnisse hat. Die Methode wird für die Proben, deren pH-Werte nicht in den oben genannten Bereich liegen, modifiziert.

Key words:: Solvatochromic dye; titration; Dimidium bromide; pH influence; detergent
Stichwörter:: Solvatochromer Farbstoff; Titration; Diimidiumbromid; pH-Werteinfluss; Waschmittel
∗ 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. 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.

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.

References

1. Tharwat, F. T.: Applied Surfactants: Principles and applications. Wiley-VCH Velrag GmbH & Co. KgaA, Weinheim, 2005.Suche in Google Scholar

2. Schramm, L. L., Stasiuk, E. N. and Marangoni, D. G.: Annu. Rep. Prog. Chem. Sect. C99 (2003). 10.1039/b208499fSuche in Google Scholar

3. Wróblewska, E. K., Gasiorowska, M. and Soroka, J. A.: Tenside Surf. Det.47 (2010) 2119Suche in Google Scholar

4. International Standard, ISO 2271: 1989 Surface active agents 1989.Suche in Google Scholar

5. Soroka, K. B. and Soroka, J. A.: Polish Patent No 121226 (1979).Suche in Google Scholar

6. Soroka, K. B. and Soroka, J. A.: Polish Patent No 122316 (1979).Suche in Google Scholar

7. Soroka, K. B., Soroka, J. A. and Gwiazdowski, L.: Polish Patent No 139595 (1983).Suche in Google Scholar

8. Soroka, K. B. and Soroka, J. A.: Chemica Scripta29 (1989) 167.Suche in Google Scholar

Received: 2010-10-04
Published Online: 2013-04-11
Published in Print: 2011-03-01

© 2011, Carl Hanser Publisher, Munich

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https://doi.org/10.3139/113.110112
Schlagwörter für diesen Artikel
Solvatochromic dye; titration; Dimidium bromide; pH influence; detergent

Artikel in diesem Heft

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Application
  6. Alkyl Polyglycoside/1-Naphthol Formulations: A Case Study of Surfactant Enhanced Oil Recovery
  7. 5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium Perchlorate as a New Indicator for Anionic Surface Active Agents Determination
  8. Environmental Chemistry
  9. Kinetics and Adsorption Isotherms for the Removal of Tartrazine from Aqueous Solution by Coal Ash
  10. Removal of Triphenylmethane Dye from Aqueous Solution by Carbonaceous Adsorbent
  11. European Detergents Conference
  12. Nonequilibrium Association of Oppositely Charged Macromolecules and Amphiphiles
  13. Novel Surfactants
  14. Syntheses and Properties of New Double-tail Trisiloxane Surfactants with Both Hydrolysis Resistance and High Spreading Ability
  15. Synthesis of Some Novel Sulfonamide Derivatives and Investigating their Biocidal Activity in Cooling Towers
  16. Physical Chemistry
  17. Micellar Characteristics and Surface Properties of Some Sulfobetaine Surfactants
  18. Viscosity and Percolative Phenomena in AOT based Microemulsions
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