Photometric titration of anionic polyelectrolytes using the cationic dye as a color indicator

Takashi Masadome, Mayumi Kawaguchi, Lila Kurniasari

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The cationic dye, crystal violet (CV) is applied as the indicator for the determination of anionic polyelectrolytes such as potassium poly (vinyl sulfate) (PVSK) by photometric titration, using a poly (diallyldimethylammonium chloride) (Cat-floc) solution as a titrant. Before the titrant is added to the sample solution containing CV as an indicator, the absorbance of the sample solution is relatively low because the attachment of CV to the anionic polyelectrolyte results in a decrease of the absorbance of CV at the maximum absorption wavelength (590 nm). As the amount of added titrant increases, the absorbance of the sample solution increases because the combined CV is liberated by the exchange with the titrant. After the end-point, the absorbance of the sample solution decreases slightly due to dilution with the titrant. The end-point of the titration is detected as the break point of the titration curve. The effects of the concentration of CV, coexisting electrolytes in the sample solution on the degree of the change of absorbance at the end-point were examined. A linear relationship between the concentration of anionic polyelectrolyte and the end-point volume of the titrant exists in the concentration range from 6.25 × 10-6 to 5 × 10-5 M for PVSK.

Original languageEnglish
Pages (from-to)619-625
Number of pages7
JournalAnalytical Letters
Volume36
Issue number3
DOIs
Publication statusPublished - 2003
Externally publishedYes

Fingerprint

Gentian Violet
Polyelectrolytes
Titration
Coloring Agents
Dyes
Color
Crystals
Electrolytes
Dilution
Sulfates
Potassium
polycations
Wavelength

Keywords

  • Anionic polyelectrolytes
  • Cationic dyes
  • Colloidal titration
  • Crystal Violet
  • Photometric titration

ASJC Scopus subject areas

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

Cite this

Photometric titration of anionic polyelectrolytes using the cationic dye as a color indicator. / Masadome, Takashi; Kawaguchi, Mayumi; Kurniasari, Lila.

In: Analytical Letters, Vol. 36, No. 3, 2003, p. 619-625.

Research output: Contribution to journalArticle

Masadome, Takashi ; Kawaguchi, Mayumi ; Kurniasari, Lila. / Photometric titration of anionic polyelectrolytes using the cationic dye as a color indicator. In: Analytical Letters. 2003 ; Vol. 36, No. 3. pp. 619-625.
@article{302d74d378f54bb787d289c94b74fbbc,
title = "Photometric titration of anionic polyelectrolytes using the cationic dye as a color indicator",
abstract = "The cationic dye, crystal violet (CV) is applied as the indicator for the determination of anionic polyelectrolytes such as potassium poly (vinyl sulfate) (PVSK) by photometric titration, using a poly (diallyldimethylammonium chloride) (Cat-floc) solution as a titrant. Before the titrant is added to the sample solution containing CV as an indicator, the absorbance of the sample solution is relatively low because the attachment of CV to the anionic polyelectrolyte results in a decrease of the absorbance of CV at the maximum absorption wavelength (590 nm). As the amount of added titrant increases, the absorbance of the sample solution increases because the combined CV is liberated by the exchange with the titrant. After the end-point, the absorbance of the sample solution decreases slightly due to dilution with the titrant. The end-point of the titration is detected as the break point of the titration curve. The effects of the concentration of CV, coexisting electrolytes in the sample solution on the degree of the change of absorbance at the end-point were examined. A linear relationship between the concentration of anionic polyelectrolyte and the end-point volume of the titrant exists in the concentration range from 6.25 × 10-6 to 5 × 10-5 M for PVSK.",
keywords = "Anionic polyelectrolytes, Cationic dyes, Colloidal titration, Crystal Violet, Photometric titration",
author = "Takashi Masadome and Mayumi Kawaguchi and Lila Kurniasari",
year = "2003",
doi = "10.1081/AL-120018252",
language = "English",
volume = "36",
pages = "619--625",
journal = "Analytical Letters",
issn = "0003-2719",
publisher = "Taylor and Francis Ltd.",
number = "3",

}

TY - JOUR

T1 - Photometric titration of anionic polyelectrolytes using the cationic dye as a color indicator

AU - Masadome, Takashi

AU - Kawaguchi, Mayumi

AU - Kurniasari, Lila

PY - 2003

Y1 - 2003

N2 - The cationic dye, crystal violet (CV) is applied as the indicator for the determination of anionic polyelectrolytes such as potassium poly (vinyl sulfate) (PVSK) by photometric titration, using a poly (diallyldimethylammonium chloride) (Cat-floc) solution as a titrant. Before the titrant is added to the sample solution containing CV as an indicator, the absorbance of the sample solution is relatively low because the attachment of CV to the anionic polyelectrolyte results in a decrease of the absorbance of CV at the maximum absorption wavelength (590 nm). As the amount of added titrant increases, the absorbance of the sample solution increases because the combined CV is liberated by the exchange with the titrant. After the end-point, the absorbance of the sample solution decreases slightly due to dilution with the titrant. The end-point of the titration is detected as the break point of the titration curve. The effects of the concentration of CV, coexisting electrolytes in the sample solution on the degree of the change of absorbance at the end-point were examined. A linear relationship between the concentration of anionic polyelectrolyte and the end-point volume of the titrant exists in the concentration range from 6.25 × 10-6 to 5 × 10-5 M for PVSK.

AB - The cationic dye, crystal violet (CV) is applied as the indicator for the determination of anionic polyelectrolytes such as potassium poly (vinyl sulfate) (PVSK) by photometric titration, using a poly (diallyldimethylammonium chloride) (Cat-floc) solution as a titrant. Before the titrant is added to the sample solution containing CV as an indicator, the absorbance of the sample solution is relatively low because the attachment of CV to the anionic polyelectrolyte results in a decrease of the absorbance of CV at the maximum absorption wavelength (590 nm). As the amount of added titrant increases, the absorbance of the sample solution increases because the combined CV is liberated by the exchange with the titrant. After the end-point, the absorbance of the sample solution decreases slightly due to dilution with the titrant. The end-point of the titration is detected as the break point of the titration curve. The effects of the concentration of CV, coexisting electrolytes in the sample solution on the degree of the change of absorbance at the end-point were examined. A linear relationship between the concentration of anionic polyelectrolyte and the end-point volume of the titrant exists in the concentration range from 6.25 × 10-6 to 5 × 10-5 M for PVSK.

KW - Anionic polyelectrolytes

KW - Cationic dyes

KW - Colloidal titration

KW - Crystal Violet

KW - Photometric titration

UR - http://www.scopus.com/inward/record.url?scp=0037241467&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037241467&partnerID=8YFLogxK

U2 - 10.1081/AL-120018252

DO - 10.1081/AL-120018252

M3 - Article

VL - 36

SP - 619

EP - 625

JO - Analytical Letters

JF - Analytical Letters

SN - 0003-2719

IS - 3

ER -