Application of nation-coated mercury film electrodes to the microdetermination of formaldehyde by differential-pulse voltammetry

Wing Hong CHAN*, Hao Huang

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

9 Citations (Scopus)

Abstract

Formaldehyde, after in situ conversion to an ionic derivative with Girard's reagent T, was first accumulated on a Nafion-coated mercury film electrode. The adsorbed derivative was then determined in aqueous solution using differential-pulse voltammetry. A single peak centred at -1.24 V (versus Ag-AgCl) was observed at pH 9.7 when using 0.4 mol l-1 NH4Cl-NH3 as the supporting electrolyte. The calibration graphs were rectilinear over the range from 2.0 × 10-7 to 1.0 × 10-5 mol l-1 formaldehyde. By incorporating a preconcentration step via the Nafion-modified electrode, the detection limit of the method for formaldehyde was calculated to be 3.4 × 10-8 mol l-1. The reproducibility and lifetime studies of the electrodes indicated that a newly prepared electrode could be repeatedly used for more than ten measurements with satisfactory precision. In addition, the method can be extended, without any modification, to the determination of acetaldehyde.

Original languageEnglish
Pages (from-to)1727-1730
Number of pages4
JournalAnalyst
Volume121
Issue number11
DOIs
Publication statusPublished - Nov 1996

Scopus Subject Areas

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

User-Defined Keywords

  • Differential-pulse voltammetry
  • Formaldehyde determination
  • Girard's reagent T
  • Nafion-modified electrode
  • Organic analysis

Fingerprint

Dive into the research topics of 'Application of nation-coated mercury film electrodes to the microdetermination of formaldehyde by differential-pulse voltammetry'. Together they form a unique fingerprint.

Cite this