Adsorption voltammetric determination of μg l-1 levels formaldehyde via in situ derivatization with Girard's reagent T

Wing Hong CHAN*, Tian Yao Xie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

The adsorptive voltammetric behaviour of formaldehyde (HCHO) after its in situ derivatization with trimethylaminoacetohydrazide chloride (Girard's reagent T) at a hanging mercury drop electrode (HMDE) was investigated in NH3-NH4Cl (pH 9.7) solution. The results showed that the adduct of HCHO with Girard's reagent T can be adsorbed on the surface of the HMDE, yielding one peak at -1280 mV (vs Ag/AgCl electrode), corresponding to the reduction of the adduct. The limit of detection was as low as 8.0 x 10-8 mol dm-3 (corresponding to 2.4 μg dm-3 of HCHO). The linear range of the method was 2.0 x 10-7 ~ 8.0 x 10-6 mol dm-3. The sensitivity of the method allows its application for the direct determination of HCHO in rain water samples.

Original languageEnglish
Pages (from-to)173-179
Number of pages7
JournalAnalytica Chimica Acta
Volume339
Issue number1-2
DOIs
Publication statusPublished - 28 Feb 1997

Scopus Subject Areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

User-Defined Keywords

  • Formaldehyde
  • Girard's reagent T
  • Organic analysis
  • Voltammetry

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