Issue |
Analusis
Volume 27, Number 1, January/February 1999
Importance de la lipophilie en modélisation moléculaire
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Page(s) | 45 - 52 | |
Section | Original articles | |
DOI | https://doi.org/10.1051/analusis:1999104 |
DOI: 10.1051/analusis:1999104
Comparison between two carbonyl measurement methods in the atmosphere
C.P. Ferrari1, 2, R. Durand-Jolibois3, Carlier3, V. Jacob1, A. Roche1, P. Foster1 and P. Fresnet31 Groupe de Recherche sur l'Environnement et la Chimie Appliquée, Université Joseph Fourier, I.U.T de Chimie, 39-41 boulevard Gambetta, 38000 Grenoble, France
2 Institut des Sciences et Techniques de Grenoble, Université Joseph Fourier, 28 avenue Benoît Frachon, BP. 53, 38041 Grenoble, France
3 Laboratoire Interuniversitaire des Systèmes Atmosphériques, associé au CNRS, Centre Multidisciplinaire, Universités Paris VII et Paris XII, 61 avenue du General De Gaulle, 94010 Creteil Cedex, France
Abstract
Two atmospheric aldehyde sampling techniques, the impinger method in which aldehydes are trapped in a 2,4-dinitrophenylhydrazine acidified acetonitrile solution, and the method in which
aldehydes are captured in 2,4-dinitrophenylhydrazine acidified coated cartridges commercialised by the WATERS
, were compared for blank values, sample preservation, ozone action, and
water influence. The two methods were tested in a Paris atmosphere and the influence of a KI ozone scrubber has been evaluated. Except for acetaldehyde and benzaldehyde, the two techniques
do not give coherent results. When no ozone scrubber is used, the cartridge technique gives systematically lower values. Bad correlation has been obtained between data with scrubber and data
without scrubber for the impinger technique except for acetaldehyde. For the cartridge technique, the correlation is better for all the aldehydes but higher values are found when a scrubber is used,
except for formaldehyde. Ozone action leads to 2,4-dinitrophenylhydrazone destruction, but also to formaldehyde 2,4-dinitrophenylhydrazone formation by reaction between airborne volatile
organic compounds and ozone on the cartridge surfaces.
Key words: Aldéhydes / ketones / impinger / cartridge / ozone / field measurement
© EDP Sciences, Wiley-VCH 1999