DOI: 10.1016/j.atmosenv.2016.11.059
Scopus记录号: 2-s2.0-85005949167
论文题名: Kinetics of the photolysis and OH reaction of 4-hydroxy-4-methyl-2-pentanone: Atmospheric implications
作者: Aslan L ; , Laversin H ; , Coddeville P ; , Fittschen C ; , Roth E ; , Tomas A ; , Chakir A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 150 起始页码: 256
结束页码: 263
语种: 英语
英文关键词: 4-Hydroxy-4-methyl-2-pentanone
; Kinetics
; OH radicals
; Photolysis
; Tropospheric lifetimes
Scopus关键词: Absorption spectroscopy
; Acetone
; Chemical reactions
; Enzyme kinetics
; Free radicals
; Kinetics
; Meteorological instruments
; Phase interfaces
; Photolysis
; Temperature distribution
; 4-hydroxy-4-methyl-2-pentanone
; Atmospheric implications
; Cross-section measurement
; OH radical
; Photolysis frequencies
; Temperature dependence
; Tropospheric lifetime
; UV absorption spectrum
; Reaction kinetics
; 4 hydroxy 4 methyl 2 pentanone
; acetone
; benzaldehyde
; formaldehyde
; hydroxyl radical
; ketol
; methanol
; unclassified drug
; absorption spectrum
; atmospheric chemistry
; formaldehyde
; hydroxyl radical
; ketone
; methanol
; photolysis
; reaction kinetics
; spectral analysis
; temperature
; troposphere
; ultraviolet radiation
; absorption spectroscopy
; Article
; atmospheric pressure
; light absorption
; photolysis
; priority journal
; quantum yield
; temperature
; temperature dependence
; vapor pressure
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: This study provides the first kinetic and mechanistic study of the photolysis of 4-hydroxy-4-methyl-2-pentanone (4H4M2P) and the determination of the temperature dependence of the relative rate coefficient for the reaction of OH radicals with 4H4M2P. The UV absorption spectrum of 4H4M2P was determined in the spectral range 200–360 nm. The photolysis frequency of this compound in the atmosphere was evaluated relative to actinometers and found to be J4H4M2P atm=4.2×10−3h−1, corresponding to a lifetime of about 10 days. Using 4H4M2P cross section measurements, an atmospheric effective quantum yield of 0.15 was calculated. The main primary photolysis products were acetone (121 ± 4) % and formaldehyde (20 ± 1) %. A low methanol yield of (3.0 ± 0.3) % was also determined. These results enabled us to propose a mechanistic scheme for the photolysis. Rate coefficients for the reaction of 4H4M2P with OH radicals were determined over the temperature range 298–354 K and the following Arrhenius expression was obtained: kOH+4M4H2P = (1.12 ± 0.40) × 10−12exp(461.5 ± 60/T) cm3 molecule−1 s−1. The lifetimes of 4H4M2P due to reaction with OH radicals has been estimated to ∼2.5 days and indicates that the gas-phase reaction with the OH could be the main loss process for this compound. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82250
Appears in Collections: 气候变化事实与影响
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作者单位: Mines Douai, Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), Douai, France; Université Lille Nord de France, Lille, France; Groupe de Spectrométrie Moléculaire et Atmosphérique, Université de Reims, UMR CNRS 7331, Reims, France; Université Lille, CNRS, UMR 8522, PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, Lille, France
Recommended Citation:
Aslan L,, Laversin H,, Coddeville P,et al. Kinetics of the photolysis and OH reaction of 4-hydroxy-4-methyl-2-pentanone: Atmospheric implications[J]. Atmospheric Environment,2017-01-01,150