DOI: 10.1016/j.atmosenv.2013.10.031
Scopus记录号: 2-s2.0-84887007844
论文题名: Heterogeneous oxidation of folpet and dimethomorph by OH radicals: A kinetic and mechanistic study
作者: Al Rashidi M ; , Chakir A ; , Roth E
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 82 起始页码: 154
结束页码: 171
语种: 英语
英文关键词: Atmospheric life-times
; Dimethomorph
; Folpet
; Heterogeneous kinetics
; Mechanism
; Ozone
; Pesticides
Scopus关键词: Degradation mechanism
; Degradation products
; Dimethomorph
; Experimental methods
; Folpet
; Heterogeneous kinetics
; Heterogeneous oxidation
; Life-times
; Chemical analysis
; Degradation
; Free radicals
; Fungicides
; Kinetics
; Mechanisms
; Ozone
; Pesticides
; Rate constants
; Oxidation
; dimethomorph
; folpet
; fungicide
; hydroxyl radical
; terbutylazine
; unclassified drug
; analytical method
; experimental study
; fungicide
; heterogeneity
; oxidation
; reaction rate
; removal experiment
; simulation
; air pollution
; article
; atomic force microscopy
; chemical structure
; controlled study
; degradation
; degradation kinetics
; humidity
; ion monitoring
; kinetics
; mass fragmentography
; mathematical analysis
; mechanics
; oxidation
; oxidation kinetics
; photolysis
; priority journal
; simulation
; troposphere
; Champagne-Ardenne
; France
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 investigates the heterogeneous OH oxidation of folpet and dimethomorph, two fungicides identified in the atmosphere of the Champagne-Ardenne region. Kinetic experiments were conducted in the relative mode, using terbuthylazine as a reference compound. The experimental method employed makes use of a simulation chamber coupled to a GC/MS analytical system. Meanwhile, the identification of (4-chlorophenyl)(3,4-dimethoxyphenyl)methanone (CPMPM), a degradation product of the OH oxidation of dimethomorph, is achieved using SPME/GC/MS. Moreover, a degradation mechanism of dimethomorph is proposed, and the heterogeneous OH reactivity of CPMPM is evaluated. The obtained OH reaction rate constants (cm3molecule-1s-1) are: kZ-dimethomorph=(2.0±1.2) 10-14, kE-dimethomorph=(1.7±1.2) 10-14, kFolpet=(1.6±0.9) 10-13 and kCPMPM=(1.9±1.0) 10-12. The implicated tropospheric life-times are up to 2 months, which shows that the investigated pesticides are relatively persistent towards oxidation removal processes. CPMPM, the identified product of OH oxidation of dimethomorph, is less persistent with a life time of only 6 days relative to heterogeneous oxidation by OH radicals. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81054
Appears in Collections: 气候变化事实与影响
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作者单位: GSMA, UMR CNRS 6089, Université de Reims Champagne Ardennne, U.F.R. Sciences Exactes et Naturelles, Moulin de la Housse, B.P. 1039, 51687 Reims, France
Recommended Citation:
Al Rashidi M,, Chakir A,, Roth E. Heterogeneous oxidation of folpet and dimethomorph by OH radicals: A kinetic and mechanistic study[J]. Atmospheric Environment,2014-01-01,82