A simple fluorophotometer for airborne formaldehyde determination

Hongyan Yuan, Lianzhi Lin, Sheng E. Wang, Dan Xiao*, Martin M F CHOI, Wing Hong CHAN

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

3 Citations (Scopus)


A novel, simple, and small synchronous fluorescence and absorbance device in conjunction with a homemade passive gas sampler for the determination of formaldehyde in ambient air is described. A purple-blue light LED is used as light source, and two perpendicular photoresistors are applied to measure absorbance and fluorescence, respectively. An absorbing reagent, which consisted of a 2,4-pentanedione, ammonium acetate, and acetic acid solution, is enclosed in the sampler and used to collect and react with airborne formaldehyde. The reaction product, yellow 3,5-diacetyl-1, 4-dihydrolutidine, is then detected by the synchronous fluorescence and absorbance detectors. The light intensity is inversely proportional to the resistance of the photoresistor. The proposed device has been successfully applied to the determination of formaldehyde at various sites.

Original languageEnglish
Pages (from-to)185-193
Number of pages9
JournalSpectroscopy Letters
Issue number2
Publication statusPublished - 2005

Scopus Subject Areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

User-Defined Keywords

  • Absorbance
  • Air
  • Fluorescence
  • Formaldehyde
  • Light-emitting diode
  • Photo resistor
  • Sampling
  • Synchronous detector


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