Determination of sulfate ion by potentiometric back-titration using sodium tetrakis (4-fluorophenyl) borate as a titrant and a titrant-sensitive electrode

Takashi Masadome, Yasukazu Asano

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A potentiometric back-titration method for the determination of sulfate ions using a plasticized poly(vinyl chloride) membrane electrode sensitive to a titrant is described. The method is based on ion association between the excess of 2-aminoperimidinium added to the sulfate ion in the sample and sodium tetrakis (4-fluorophenyl) borate (FPB) in the titrant. The titration end-point was detected as a sharp potential change due to an increase in the concentration of the free FPB at the equivalence point. The end-point was detected even in the presence of a 20-fold excess of common cations and anions relative to the concentration of the sulfate ion within ~2% of titration error. A linear relationship between the concentration of the sulfate ion and the end-point volume of the titrant exists in the sulfate ion concentration range from 2 x 10-4 to 3 x 10-3 mol l-1 using 10-2 mol l-1 FPB solutions as the titrant. The present method could be applied to determine sulfate ions in sea water.

Original languageEnglish
Pages (from-to)669-673
Number of pages5
JournalTalanta
Volume48
Issue number3
DOIs
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

Borates
Titration
Sulfates
Sodium
Ions
Electrodes
Vinyl Chloride
Anions
Cations
Association reactions
Membranes
Water

Keywords

  • 2-Aminoperimidinium bromide
  • Plasticized poly (vinyl chloride) membrane
  • Potentiometric back-titration
  • Sea water
  • Sodium tetrakis (4-fluorophenyl) borate
  • Sulfate ion

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

Cite this

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title = "Determination of sulfate ion by potentiometric back-titration using sodium tetrakis (4-fluorophenyl) borate as a titrant and a titrant-sensitive electrode",
abstract = "A potentiometric back-titration method for the determination of sulfate ions using a plasticized poly(vinyl chloride) membrane electrode sensitive to a titrant is described. The method is based on ion association between the excess of 2-aminoperimidinium added to the sulfate ion in the sample and sodium tetrakis (4-fluorophenyl) borate (FPB) in the titrant. The titration end-point was detected as a sharp potential change due to an increase in the concentration of the free FPB at the equivalence point. The end-point was detected even in the presence of a 20-fold excess of common cations and anions relative to the concentration of the sulfate ion within ~2{\%} of titration error. A linear relationship between the concentration of the sulfate ion and the end-point volume of the titrant exists in the sulfate ion concentration range from 2 x 10-4 to 3 x 10-3 mol l-1 using 10-2 mol l-1 FPB solutions as the titrant. The present method could be applied to determine sulfate ions in sea water.",
keywords = "2-Aminoperimidinium bromide, Plasticized poly (vinyl chloride) membrane, Potentiometric back-titration, Sea water, Sodium tetrakis (4-fluorophenyl) borate, Sulfate ion",
author = "Takashi Masadome and Yasukazu Asano",
year = "1999",
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AU - Masadome, Takashi

AU - Asano, Yasukazu

PY - 1999

Y1 - 1999

N2 - A potentiometric back-titration method for the determination of sulfate ions using a plasticized poly(vinyl chloride) membrane electrode sensitive to a titrant is described. The method is based on ion association between the excess of 2-aminoperimidinium added to the sulfate ion in the sample and sodium tetrakis (4-fluorophenyl) borate (FPB) in the titrant. The titration end-point was detected as a sharp potential change due to an increase in the concentration of the free FPB at the equivalence point. The end-point was detected even in the presence of a 20-fold excess of common cations and anions relative to the concentration of the sulfate ion within ~2% of titration error. A linear relationship between the concentration of the sulfate ion and the end-point volume of the titrant exists in the sulfate ion concentration range from 2 x 10-4 to 3 x 10-3 mol l-1 using 10-2 mol l-1 FPB solutions as the titrant. The present method could be applied to determine sulfate ions in sea water.

AB - A potentiometric back-titration method for the determination of sulfate ions using a plasticized poly(vinyl chloride) membrane electrode sensitive to a titrant is described. The method is based on ion association between the excess of 2-aminoperimidinium added to the sulfate ion in the sample and sodium tetrakis (4-fluorophenyl) borate (FPB) in the titrant. The titration end-point was detected as a sharp potential change due to an increase in the concentration of the free FPB at the equivalence point. The end-point was detected even in the presence of a 20-fold excess of common cations and anions relative to the concentration of the sulfate ion within ~2% of titration error. A linear relationship between the concentration of the sulfate ion and the end-point volume of the titrant exists in the sulfate ion concentration range from 2 x 10-4 to 3 x 10-3 mol l-1 using 10-2 mol l-1 FPB solutions as the titrant. The present method could be applied to determine sulfate ions in sea water.

KW - 2-Aminoperimidinium bromide

KW - Plasticized poly (vinyl chloride) membrane

KW - Potentiometric back-titration

KW - Sea water

KW - Sodium tetrakis (4-fluorophenyl) borate

KW - Sulfate ion

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