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Rate constants for the gas-phase reactions of a series of C3C6 aldehydes with OH and NO3 radicals

✍ Scribed by Christine Papagni; Janet Arey; Roger Atkinson

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 83 KB
Volume: 32
Category: Article
ISSN: 0538-8066
DOI: 10.1002/(sici)1097-4601(2000)32:2<79::aid-kin2>3.0.co;2-a

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✦ Synopsis

By using relative rate methods, rate constants for the gas-phase reactions of OH and NO 3 radicals with propanal, butanal, pentanal, and hexanal have been measured at 296 Ϯ 2 K and atmospheric pressure of air. By using methyl vinyl ketone as the reference compound, the rate constants obtained for the OH radical reactions (in units of 10 Ϫ12 cm 3 molecule Ϫ1 s Ϫ1 ) were propanal, 20.2 Ϯ 1.4; butanal, 24.7 Ϯ 1.5; pentanal, 29.9 Ϯ 1.9; and hexanal, 31.7 Ϯ 1.5. By using methacrolein and 1-butene as the reference compounds, the rate constants obtained for the NO 3 radical reactions (in units of 10 Ϫ15 cm 3 molecule Ϫ1 s Ϫ1 ) were propanal, 7.1 Ϯ 0.4; butanal, 11.2 Ϯ 1.5; pentanal, 14.1 Ϯ 1.6; and hexanal, 14.9 Ϯ 1.3. The dominant tropospheric loss process for the aldehydes studied here is calculated to be by reaction with the OH radical, with calculated lifetimes of a few hours during daytime.

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