DOI: 10.1016/j.atmosenv.2014.12.022
Scopus记录号: 2-s2.0-84916917820
论文题名: UV absorption cross sections between 290 and 380nm of a series of furanaldehydes: Estimation of their photolysis lifetimes
作者: Colmenar I ; , González S ; , Jiménez E ; , Martín P ; , Salgado S ; , Cabañas B ; , Albaladejo J
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 103 起始页码: 1
结束页码: 6
语种: 英语
英文关键词: Actinic region
; Furanaldehydes
; Photolysis frequencies
; UV absorption cross sections
Scopus关键词: Aldehydes
; Free radicals
; Light absorption
; Photolysis
; Sun
; Absorption cross sections
; Actinic region
; Degradation pathways
; Furanaldehydes
; Homogeneous reaction
; Photolysis frequencies
; Tropospheric oxidants
; UV absorption
; Photodegradation
; 2 furanaldehyde
; 3 furanaldehyde
; 5 methyl 2 furanaldehyde
; aldehyde derivative
; deuterium
; hydroxyl radical
; unclassified drug
; absorption
; actinic flux
; aldehyde
; atmospheric chemistry
; furan
; oxidant
; photolysis
; radical
; solar radiation
; ultraviolet radiation
; Article
; chemical reaction
; photolysis
; quantum yield
; radiation absorption
; room temperature
; solar radiation
; troposphere
; ultraviolet radiation
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: Furanaldehydes, such as 2-furanaldehyde (also known as furfural), 3-furanaldehyde and 5-methyl-2-furanaldehyde, are aromatic aldehydes which can be present in the atmosphere as primary and secondary pollutants. The atmospheric removal initiated by sunlight for these species is not well-known in the solar actinic region (at λ>290nm), mainly due to the absence of data concerning the UV absorption cross sections (σλ) and photolysis frequencies (Ji(z,θ)). In this work σλ for the mentioned furanaldehydes have been determined between 290 and 380nm at room temperature for the first time. Experiments were performed in an absorption jacketed Pyrex cell, employing a deuterium lamp as irradiation source and a CCD detector. The obtained absorption spectra exhibit absorption maxima around 320nm with absolute absorption cross sections of 1.13, 0.75 and 1.14×10-19cm2molecule-1 for 2-furanaldehyde, 3-furanaldehyde and 5-methyl-2-furanaldehyde, respectively. The reported UV absorption cross sections were used to provide estimates of Ji(z,θ) and, therefore, estimates of the lifetime (τhν) due to this atmospheric removal process, under different solar radiation situations. Estimated τhν have been compared with the lifetimes due to the homogeneous reaction with the main diurnal tropospheric oxidants. The results obtained suggest that photolysis in the actinic region can be the main degradation pathway for these furanaldehydes when assuming a quantum yield (Φλ) of unity and the maximum solar actinic flux, while photolysis can compete with the reaction of OH radicals when assuming Φλ=0.1. On the contrary, the removal of all three furanaldehydes by the reactions with OH radicals becomes more important than the UV photolysis under low solar actinic flux conditions independently of Φλ. If the emission source of these furanaldehydes also occurs during the nighttime NO3 radicals will dominate the elimination process of these species. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82048
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Physical Chemistry, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, Avda. Camilo José Cela s/n, Ciudad Real, Spain; Research Institute on Combustion and Atmospheric Pollution, University of Castilla-La Mancha, Camino de Moledores s/n, Ciudad Real, Spain
Recommended Citation:
Colmenar I,, González S,, Jiménez E,et al. UV absorption cross sections between 290 and 380nm of a series of furanaldehydes: Estimation of their photolysis lifetimes[J]. Atmospheric Environment,2015-01-01,103