Berlin 2005 – wissenschaftliches Programm
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UP: Umweltphysik
UP 8: Poster: Atmosph
ärische Spurengase und Aerosole: Laboruntersuchungen
UP 8.2: Poster
Dienstag, 8. März 2005, 10:15–12:15, Poster TU HTF
Atmospheric chemistry of C3-C6 cycloalkanecarbaldehydes — •Armin Wisthaler1, Barbara D’Anna2, Oivind Andreasen2, Jyrki Viidanoja3, Niels R. Jensen3, Jens Hjorth3, Claus J. Nielsen2, and Armin Hansel1 — 1Institute of Ion Physics, Universitity of Innsbruck, Austria — 2Department of Chemistry, University of Oslo, Norway — 3European Commission, DG - Joint Research Centre, Institute for Environment and Sustainability, Climate Change Unit, Ispra, Italy
Monoterpenes are emitted to the atmosphere from vegetative sources, they are highly reactive and play an important role in the chemistry of the lower troposphere. The gas-phase oxidation mechanism of monoterpenes is not completely explained, but substituted cycloalkanecarbaldehydes have been identified as important oxidation intermediates. In the present study, the hydroxyl radical and nitrate radical reaction rate coefficients of cyclopropanecarbaldehyde, cyclobutanecarbaldehyde, cyclopentanecarbaldehyde and cyclohexanecarbaldehyde have been measured at room temperature and atmospheric pressure of air. In addition, the gas phase reaction products of the cycloalkanecarbaldehydes with OH in the presence of NOx have been investigated using long-path FT-IR spectroscopy and proton-transfer-reaction mass spectrometry (PTR-MS). The identified products cover a wide spectrum of compounds including nitroperoxycarbonyl cycloalkanes, cycloketones, cycloalkyl nitrates, multifunctional compounds containing carbonyl, hydroxy and nitrooxy functional groups, HCOOH, HCHO, CO and CO2.