Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要:
The kinetics of the reactions of n-butyl (BTN), isobutyl (IBN), n-pentyl (PTN) and 3-methyl-1-butyl (3M1BN) nitrates with OH radicals has been studied using a low pressure flow tube reactor combined with a quadrupole mass spectrometer. The rate constants of the title reactions were determined under pseudo-first order conditions from kinetics of OH consumption in high excess of the nitrates. The overall rate coefficients, kBTN�= 1.0�� 10− 13(T/298)3.36exp(838/T) (T�=�288–500�K), kIBN�= 2.8�� 10− 14(T/298)4.09exp(1127/T) (T�=�283–500�K), kPTN�= 1.26�� 10− 12(T/298)4.56exp(45/T) (T�=�298–496�K) and k3M1BN�= 8.47�10−14(T/298)3.52exp(1069/T) cm3molecule−1s−1(T�=�288–538�K) (with conservative 15% uncertainty), were determined at a total pressure of 1�Torr of helium. The yields of the carbonyl compounds, n-butanal (n-C3H7CHO) and isobutanal ((CH3)2CHCHO), resulting from the abstraction by OH of an α-hydrogen atom in n-butyl and isobutyl nitrates, followed by α-substituted alkyl radical decomposition, were determined at T�=�300�K to be 0.10���0.02 and 0.15���0.03, respectively. The calculated tropospheric lifetimes of BTN, IBN, PTN and 3M1BN indicate that reaction of these nitrates with OH represents an important sink of these compounds in the atmosphere. � 2017 Elsevier Ltd
Institut de Combustion, A�rothermique, R�activit� et Environnment (ICARE), CNRS and Universit� d'Orl�ans, Orl�ans, France
Recommended Citation:
Bedjanian Y,, Morin J,, Romanias M,et al. Kinetics of the reactions of OH radicals with n-butyl, isobutyl, n-pentyl and 3-methyl-1-butyl nitrates[J]. Atmospheric Environment,2017-01-01,155