In this review we summarize the most recent results concerning to the kinetic study of the NO3 radical reactions with a series of aldehydes and the influence of temperature on their rate constants. The experiments reviewed here were carried out using an absolute technique in a fast flow tube system, coupled to a laser induced fluorescence (LIF) detection for the nitrate radical, over the range of temperature 298-433 K. The measured room temperature rate constants are in units of 10-14 cm3 molecule-1 s-1:
0.32±0.04, 0.6±0.06, 1.46±0.16,
1.75±0.03, 1.83±0.36, 2.37±0.42,
1.61±0.13, 2.80±0.3, 2.56±0.25,
2.45±0.02, 0.25±0.04, 1.61±0.19,
2.88±0.29, 5.49±0.95, 9.59±0.19,
26.40±0.40, for the reactions of nitrate radical with acetaldehyde, propanal, butanal, pentanal, hexanal, heptanal, 2-methylpropanal(isobutanal), 2-methyl-butanal, 3-methylbutanal 2,2- dimethylpropanal (trimetylacetaldehyde),. acrolein, crotonaldehyde, trans-2-pentenal, trans-2-hexenal, trans-2-heptenal, cis-4- heptenal, respectively.
Tropospheric lifetimes for these aldehydes, have been calculated at night and during the daytime, for typical NO3 and OH radicals concentrations showing that both radicals provide an effective tropospheric sink for these compounds. And that the night-time reaction with NO3 radical can be an important loss process for these emitted organics and for the NO3 radicals. The present work aims wants to contribute with a review of aldehydes data to the study of NO3 reactivity and to evaluate the importance of these reactions in the atmospheric chemistry.
Buy this Article