Ion-selective electrodes in organic analysis: determination of vanillin via in situ generation of its girard's reagent P derivative

Wing Hong CHAN*, Albert W M LEE, Alice Chui Wah Ng

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

7 Citations (Scopus)

Abstract

A hydrazone-selective electrode based on the vanillin hydrazone - tetraphenylborate ion pair in a poly(vinyl chloride) matrix membrane is proposed for the determination of vanillin. Vanillin was first reacted with Girard's reagent P [1-(carbazoylmethyl)pyridinium chloride] to give the corresponding hydrazone in aqueous solution. The hydrazone was generated in situ and was then determined with the vanillin hydrazone-selective electrode. The electrode exhibits significant potentiometric response in the concentration range 10-2 -4 × 10-5 M hydrazone. It has a working pH range of 4.5-6, a short static response time (less than 60 s) and the response remains stable for at least 1 month. The results obtained with the proposed method agreed well with those given by UV spectrophotometry. This methodology could be extended to carbonyl compounds.

Original languageEnglish
Pages (from-to)205-207
Number of pages3
JournalAnalyst
Volume115
Issue number2
DOIs
Publication statusPublished - 1990

Scopus Subject Areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry

User-Defined Keywords

  • Girard's reagent P
  • In situ hydrazone formation
  • Ion-selective electrode
  • Organic analysis
  • Vanillin determination

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