Kinetics of the reactions of OH radicals with selected acetates and other esters under simulated atmospheric conditions

Abstract

The relative hydroxyl radical reaction rate constants from the simulated atmospheric oxidation of selected acetates and other esters have been measured. Reactions were carried out at 297 2 2 K in 100-liter FEP Teflon@-film bags. The OH radicals were generated from the photolysis of methyl nitrite in pure air. Using a rate constant of 2.63 X lo-" cm3 molecule-' s-l for the reaction of OH radicals with propene, the principal reference organic compound, the rate constants (x1Ol2 cm3 molecule-' s-*) obtained for the acetates and esters used in this study are: Error limits represent 20 from linear least-squares analysis of data. A linear correlation was observed for a plot of the measured relative rate constants vs. the number of CH2 groups per molecule of the following acetates: methyl acetate, ethyl acetate, n-propyl acetate, butyl acetate, and pentyl acetate. 0

Gas-phase reaction of ozone withtrans-2-hexenal,trans-2-hexenyl acetate, ethylvinyl ketone, and 6-methyl-5-hepten-2-one

“…Unsaturated carbonyls have received attention as toxic air contaminants [32,33] and as major reaction products in the atmospheric oxidation of aromatic hydrocarbons [34,35]. Unsaturated esters are of concern in indoor air quality [36] and as emissions from industrial cleaning and painting operations [37].…”

The hydroxyl radical reaction rate constant and products of ethyl 3-ethoxypropionate

“…The experimental procedures for determining the reaction kinetics were similar to those described previously [10,11].…”

“…reaction were conducted with a previously described apparatus [1,10,11]. A brief description is provided here.…”

Regional Modeling of Aerosol Chemical Composition at the Puy de Dôme (France)

“…Dans un premier temps, la constante de réactivité de chaque catégorie d'émission k cat,HO est définie. Pour ce faire, les constantes de réaction avec HO , k i,HO (Wallington et al, 1988 ;Dagaut et al, 1989 ;Atkinson, 1990 ;Williams et al, 1993 ;Kwok and Atkinson, 1995), de chaque espèce émise « i » appartenant à la catégorie « cat » sont multipliées par leur taux d'émission E i . Ce produit est pondéré par la somme des taux d'émission E i de ces espèces.…”