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 / Elwira Katarzyna Wroblewska in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 47, N° 2/2010 (03-04/2010)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 47, N° 2/2010 (03-04/2010) . - p. 119-122 Titre : 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 Type de document : texte imprimé Auteurs : Elwira Katarzyna Wroblewska, Auteur ; M. Gasiorowska, Auteur ; J. A. Soroka, Auteur Année de publication : 2010 Article en page(s) : p. 119-122 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bromure de dimidium Colorants Détergents Solvatochromisme Volumétrie (chimie analytique) Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : 5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate (Ia) was used as an indicator for anionic surface active agents determination in the manual direct two-phase titration according to the International Standard [ISO 2271:1989] Surface active agents. The solvatochromic dye (Ia) can successfully replace the recommended mixed indicator consisting of a mixture of Acid Blue I and carcinogenic dimidium bromide. The detection of the titration endpoint with use of this dye turned out much easier than with the use of the mixed indicator. The procedure was also modified replacing carcinogenic and mutagenic chloroform with less toxic dichloromethane. The concentrations of the anionic surface – active substances in few commercially available products were determined using modified two-phase titration method. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8881 [article]

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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 / Elwira Katarzyna Wroblewska in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 2/2011 (03-04/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 2/2011 (03-04/2011) . - p. 127-129 Titre : 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 Type de document : texte imprimé Auteurs : Elwira Katarzyna Wroblewska, Auteur ; M. Gasiorowska, Auteur Année de publication : 2011 Article en page(s) : p. 127-129 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bromure de dimidium Colorants Détergents pH Solvatochromisme Volumétrie (chimie analytique) Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : 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. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11120 [article]

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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 Gasiorowska in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 2 (03-04/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 2 (03-04/2012) . - p. 97-99 Titre : Manual direct two-phase titration method for anionic surface active agents determination with use of solvatochromic dye. The modification towards toxicity abatement Type de document : texte imprimé Auteurs : Monika Gasiorowska, Auteur ; Elwira Katarzyna Wroblewska, Auteur Année de publication : 2012 Article en page(s) : p. 97-99 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Détergents Pigments Solvatochromisme Volumétrie (chimie analytique) Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : 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. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13894 [article]

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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-7hindolo[1,2-a]quinolinium perchlorate dye / M. Gasiorowska in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 23-25 Titre : Two-phase titration method for cationic surface active agents determination with use of 5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7hindolo[1,2-a]quinolinium perchlorate dye Type de document : texte imprimé Auteurs : M. Gasiorowska, Auteur ; Elwira Katarzyna Wroblewska, Auteur Année de publication : 2012 Article en page(s) : p. 23-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cations Pigments Solvatochromisme Surfactants Volumétrie (chimie analytique) Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : 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. Note de contenu : - EXPERIMENTAL : Chemicals - Commercial products - Procedure - RESULTS AND DISCUSSION : Test of the method - Determination of cationic surface active agents in commercial products Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13308 [article]

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