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 language | English |
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Pages (from-to) | 205-207 |
Number of pages | 3 |
Journal | The Analyst |
Volume | 115 |
Issue number | 2 |
DOIs | |
Publication status | Published - 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