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An experimental study on the temperature dependence for the gas-phase reactions of NO3 radical with a series of aliphatic aldehydes
An experimental study on the temperature dependence for the gas-phase reactions of NO3 radical with a series of aliphatic aldehydes
- Source :
-
Journal of Atmospheric Chemistry . Sep2001, Vol. 40 Issue 1, p23. 0p. - Publication Year :
- 2001
-
Abstract
- The absolute rate constants for the gas-phase reactions of the NO3 radical with a series of aldehydes such as acetaldehyde, propanal, butanal, pentanal, hexanal and, heptanal were measured over the temperature range 298-433 K, using a discharge flow system and monitoring the NO3 radical by Laser Induced Fluorescence (LIF). The measured rate constants at 298 K for the reaction of NO3, in units of 10-14 cm3 molecule-1 s-1, were as follows: acetaldehyde 0.32 1 0.04, propanal 0.60 1 0.06, butanal 1.46 1 0.16, pentanal 1.75 1 0.06, hexanal 1.83 1 0.36, and heptanal 2.37 1 0.42. The proposed Arrhenius expressions are k1 = (6.2 1 7.5) x 10-11 exp [?(2826 1 866)/T] (cm3 molecule-1 s-1), k2 = (1.7 1 1.0) x 10-11 exp [?(2250 1 192)/T] (cm3 molecule-1 s1), k3 =(7.6 19.8) x 1011 exp [?(2466 1 505)/T] (cm3 molecule-1 s-1), k4 = (2.8 1 1.4) x 10-11 exp [?(2189 1 156)/T] (cm3 molecule-1s-1), k5 = (7.0 1 1.8) x 10-11 exp [?(2382 1 998)/T] (cm3 molecule-1 s-1), and k6 = (7.8 1 1.0) x 10-11 exp [?(2406 1 481)/T] (cm3 molecule-1 s-1). Tropospheric lifetimes for these aldehydes were calculated at night and during the day for typical NO3 and OH average concentrations and showed that both radicals provide an effective tropospheric sink for these compounds and that the night-time reaction with the NO3 radical can be an important, if not dominant, loss process for these emitted organics and for NO3 radicals. [ABSTRACT FROM AUTHOR]
- Subjects :
- *TROPOSPHERE
*TEMPERATURE effect
*NITRATES
*ATMOSPHERIC chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 01677764
- Volume :
- 40
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Journal of Atmospheric Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 8436046