Citation:
Opas Bunkoed, Frank Davis, Proespichaya Kanatharana, Panote Thavarungkul, Seamus P.J. Higson, Sol-gel based sensor for selective formaldehyde determination, Analytica Chimica Acta, Volume 659, Issues 1-2, 5 February 2010, Pages 251-257
Abstract:
We report the development of transparent sol–gels with entrapped sensitive and
selective reagents for the detection of formaldehyde. The sampling method is
based on the adsorption of formaldehyde from the air and reaction with β-
diketones (for example acetylacetone) in a sol–gel matrix to produce a yellow
product, lutidine, which was detected directly. The proposed method does not
require preparation of samples prior to analysis and allows both screening by
visual detection and quantitative measurement by simple spectrophotometry. The
detection limit of 0.03 ppmv formaldehyde is reported which is lower than the
maximum exposure concentrations recommended by both the World Health
Organisation (WHO) and the Occupational Safety and Health Administration (OSHA).
This sampling method was found to give good reproducibility, the relative
standard deviation at 0.2 and 1 ppmv being 6.3% and 4.6%, respectively. Other
carbonyl compounds i.e. acetaldehyde, benzaldehyde, acetone and butanone do not
interfere with this analytical approach. Results are provided for the
determination of formaldehyde in indoor
