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)


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
Issue number3
Publication statusPublished - 1999 Mar



  • 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

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