Determination of Cationic Surfactants by a Photometric Titration Method with Crystal Violet as a Color Indicator

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The cationic dye, crystal violet, is applied to the indicator for the determination of cationic surfactants such as benzyldimethyltetradecylammonium chloride by photometric titration, using a potassium poly(vinyl sulfate) (PVSK) solution as a titrant. Before the titrant is added to the sample solution containing crystal violet, the absorbance of the crystal violet itself is observed because the crystal violet does not react with the cationic surfactants in the sample solution. Before the equivalence point, the absorbance of the sample solution decreased slightly as the amount of added titrant increases. The decreased absorbance may be due to that the cationic surfactant in the sample solution, preferentially forms ion associate with the titrant and, hence, the sample solution is diluted with the titrant. After the end-point, the absorbance of the sample solution decreases abruptly by abrupt decrease of the concentration of crystal violet caused by the association reaction between the crystal violet and the titrant. The end-point of the titration is detected as the break point of the titration curve. The linear relationships between the concentration of cationic surfactants and the end-point volume of the titrant existed in the concentration range from 0 to 2. 5 × 10-5 M for benzyldimethyltetradecylammonium chloride, cetylpyridinium chloride (CPC), and stearyltrimethylammonium chloride (STA).

Original languageEnglish
Pages (from-to)499-506
Number of pages8
JournalAnalytical Letters
Volume37
Issue number3
DOIs
Publication statusPublished - 2004
Externally publishedYes

Fingerprint

Gentian Violet
Cationic surfactants
Titration
Color
Crystals
Cetylpyridinium
Sulfates
Potassium
Coloring Agents
Dyes
Association reactions
Ions

Keywords

  • Cationic dyes
  • Cationic surfactants
  • Crystal violet
  • Photometric titration

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

@article{37bab03221c34c10b86cb9c692782fa5,
title = "Determination of Cationic Surfactants by a Photometric Titration Method with Crystal Violet as a Color Indicator",
abstract = "The cationic dye, crystal violet, is applied to the indicator for the determination of cationic surfactants such as benzyldimethyltetradecylammonium chloride by photometric titration, using a potassium poly(vinyl sulfate) (PVSK) solution as a titrant. Before the titrant is added to the sample solution containing crystal violet, the absorbance of the crystal violet itself is observed because the crystal violet does not react with the cationic surfactants in the sample solution. Before the equivalence point, the absorbance of the sample solution decreased slightly as the amount of added titrant increases. The decreased absorbance may be due to that the cationic surfactant in the sample solution, preferentially forms ion associate with the titrant and, hence, the sample solution is diluted with the titrant. After the end-point, the absorbance of the sample solution decreases abruptly by abrupt decrease of the concentration of crystal violet caused by the association reaction between the crystal violet and the titrant. The end-point of the titration is detected as the break point of the titration curve. The linear relationships between the concentration of cationic surfactants and the end-point volume of the titrant existed in the concentration range from 0 to 2. 5 × 10-5 M for benzyldimethyltetradecylammonium chloride, cetylpyridinium chloride (CPC), and stearyltrimethylammonium chloride (STA).",
keywords = "Cationic dyes, Cationic surfactants, Crystal violet, Photometric titration",
author = "Takashi Masadome",
year = "2004",
doi = "10.1081/AL-120028622",
language = "English",
volume = "37",
pages = "499--506",
journal = "Analytical Letters",
issn = "0003-2719",
publisher = "Taylor and Francis Ltd.",
number = "3",

}

TY - JOUR

T1 - Determination of Cationic Surfactants by a Photometric Titration Method with Crystal Violet as a Color Indicator

AU - Masadome, Takashi

PY - 2004

Y1 - 2004

N2 - The cationic dye, crystal violet, is applied to the indicator for the determination of cationic surfactants such as benzyldimethyltetradecylammonium chloride by photometric titration, using a potassium poly(vinyl sulfate) (PVSK) solution as a titrant. Before the titrant is added to the sample solution containing crystal violet, the absorbance of the crystal violet itself is observed because the crystal violet does not react with the cationic surfactants in the sample solution. Before the equivalence point, the absorbance of the sample solution decreased slightly as the amount of added titrant increases. The decreased absorbance may be due to that the cationic surfactant in the sample solution, preferentially forms ion associate with the titrant and, hence, the sample solution is diluted with the titrant. After the end-point, the absorbance of the sample solution decreases abruptly by abrupt decrease of the concentration of crystal violet caused by the association reaction between the crystal violet and the titrant. The end-point of the titration is detected as the break point of the titration curve. The linear relationships between the concentration of cationic surfactants and the end-point volume of the titrant existed in the concentration range from 0 to 2. 5 × 10-5 M for benzyldimethyltetradecylammonium chloride, cetylpyridinium chloride (CPC), and stearyltrimethylammonium chloride (STA).

AB - The cationic dye, crystal violet, is applied to the indicator for the determination of cationic surfactants such as benzyldimethyltetradecylammonium chloride by photometric titration, using a potassium poly(vinyl sulfate) (PVSK) solution as a titrant. Before the titrant is added to the sample solution containing crystal violet, the absorbance of the crystal violet itself is observed because the crystal violet does not react with the cationic surfactants in the sample solution. Before the equivalence point, the absorbance of the sample solution decreased slightly as the amount of added titrant increases. The decreased absorbance may be due to that the cationic surfactant in the sample solution, preferentially forms ion associate with the titrant and, hence, the sample solution is diluted with the titrant. After the end-point, the absorbance of the sample solution decreases abruptly by abrupt decrease of the concentration of crystal violet caused by the association reaction between the crystal violet and the titrant. The end-point of the titration is detected as the break point of the titration curve. The linear relationships between the concentration of cationic surfactants and the end-point volume of the titrant existed in the concentration range from 0 to 2. 5 × 10-5 M for benzyldimethyltetradecylammonium chloride, cetylpyridinium chloride (CPC), and stearyltrimethylammonium chloride (STA).

KW - Cationic dyes

KW - Cationic surfactants

KW - Crystal violet

KW - Photometric titration

UR - http://www.scopus.com/inward/record.url?scp=1842434521&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=1842434521&partnerID=8YFLogxK

U2 - 10.1081/AL-120028622

DO - 10.1081/AL-120028622

M3 - Article

AN - SCOPUS:1842434521

VL - 37

SP - 499

EP - 506

JO - Analytical Letters

JF - Analytical Letters

SN - 0003-2719

IS - 3

ER -