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Manual Direct Two-Phase Titration Method for Anionic Surface Active Agents Determination with Use of Solvatochromic Dye. The Modification Towards Toxicity Abatement

  • Monika Gąsiorowska and Elwira Katarzyna Wróblewska
Published/Copyright: May 18, 2013
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Tenside Surfactants Detergents
From the journal Tenside Surfactants Detergents Volume 49 Issue 2

Abstract

The modification of the manual direct two-phase titration method for anionic surface active agent determination is presented. The purpose was to find such organic solvent which can replace solvents applied in the method i. e. chloroform or dichloromethane since both are harmful, exhibiting carcinogenic, mutagenic and, embryotoxic properties. As a new solvent 1-butanol or isobutyl alcohol was used. The reaction in the examined alcohols caused to be acidic during the titration process. Thus the solvatochromic dye (1) i. e. 5-(3-bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate has been replaced with 1-phenyl-2-[2-(3-nitro-4-hydroxy-5-methoxyphenyl)ethenyl]-3,3-dimethyl-3H-indolium perchlorate (2). The pKa (3.51) of (2) facilitates its dissociation, and has the same color change at the titration endpoint. The modified method was tested on three different concentrations of sodium dodecyl sulfate solution, and the results are in good agreement with the real ones.

Kurzfassung

Eine Modifikation der manuellen direkten Zweiphasentitration zur Bestimmung anionischer Tenside wird präsentiert. Das Ziel war, ein organisches Lösemittel zu finden, mit dem das bei dieser Methode üblicherweise eingesetzte Chloroform oder Dichlormethan ersetzt werden kann. Sowohl Chloroform als auch Dichlormethan sind gesundheitsgefährdend und haben krebserregende, mutagene und Embryonen schädigende Eigenschaften. Als Lösemittelersatz wurde 1-Butanol oder iso-Butylalkohol eingesetzt. Die Reaktion in den untersuchten Alkoholen lief während der Titration in den sauren Bereich, weshalb der solvachrome Farbstoff (1), das 5-(3-Bromo-4-hydroxy-5-methoxyphenyl)7,7-dimethyl-7H-indolo[1,2-a]-quinoliniumperchlorat gegen 1-Phenyl-2-[2-(3-Nitro-4-hydroxy-5-methoxyphenyl)ethenyl]-3,3-dimethyl-3H-indoliumperchlorat (2) ersetzt wurde. Der pKa (3.51)-Wert des Farbstoffs (2) erleichterte dessen Dissoziation bei gleichem Farbwechsel am Titrationsendpunkt. Die modifizierte Methode wurde mit drei unterschiedlich konzentrierten Natriumdodecylsulfatlösungen getestet. Die Ergebnisse zeigten eine gute Übereinstimmung zu den Resultaten, die mit der herkömmlichen Methode erzielt wurden.

Keywords: Detergent; solvatochromic dye; two-phase titration; quantitative analysis
Schlüsselwörter: Waschmittel; solvatochromer Farbstoff; Zweiphasentitration; quantitative Analyse
∗ 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: 2011-7-13
Published Online: 2013-05-18
Published in Print: 2012-03-01

© 2012, Carl Hanser Verlag, München

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https://doi.org/10.3139/113.110169
Keywords for this article
Detergent; solvatochromic dye; two-phase titration; quantitative analysis

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Application
  6. Manual Direct Two-Phase Titration Method for Anionic Surface Active Agents Determination with Use of Solvatochromic Dye. The Modification Towards Toxicity Abatement
  7. Environmental Chemistry
  8. Removal of Lead from Aqueous Solution by an Efficient Low Cost Biosorbent
  9. Removal of Crystal Violet from Water by Adsorbent Prepared from Turkish Coffee Residue
  10. Novel Surfactants
  11. Biodegradable Polyoxyethylenated Pentaerythritol Quaternary Esters as Oil Spill Dispersants
  12. Physical Chemistry
  13. Nonionic Surfactants: Octanol-Water Partition Coefficients with the Slow Stirring/Surface Tension Method
  14. Adsorption of n-Alkyl Alcohols by Polyurethane Foam Powder: Kinetics, Isotherms, and Thermodynamics
  15. Clouding and Aggregation Behavior of PPO-PEO-PPO Triblock Copolymer (Pluronic®25R4) in Surfactant Additives Environment
  16. Spontaneous Vesicle Formation from Bulky Tetrasiloxane-tailed Dicephalic Surfactant
  17. Synthesis
  18. Synthesis and Properties of a New Tetrasiloxane-tailed Dicephalic Surfactant
  19. Synthesis, Characterization and Anti-redeposition Properties of Sulfoethyl Locust Bean Gum – Interaction with Laundry Detergent Enzymes
  20. Synthesis and Properties of Three Series Amino Acid Surfactants
  21. Synthesis and Properties of Disodium Mono-fatty Alcohol Citrate
  22. Conference and Meeting Report
  23. Washing at Low Temperatures – Saving Energy, Ensuring Hygiene
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