DOI: 10.1016/j.atmosenv.2017.04.025
Scopus记录号: 2-s2.0-85019078336
论文题名: Are organic films from atmospheric aerosol and sea water inert to oxidation by ozone at the air-water interface?
作者: Jones S ; H ; , King M ; D ; , Ward A ; D ; , Rennie A ; R ; , Jones A ; C ; , Arnold T
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 161 起始页码: 274
结束页码: 287
语种: 英语
英文关键词: Atmospheric aerosol
; Heterogeneous oxidation
; OH radical
; Ozone
; Sea-water
; Thin film
; X-ray reflectivity
Scopus关键词: Aerosols
; Air
; Atmospheric aerosols
; Atmospheric thermodynamics
; Earth (planet)
; Electrospray ionization
; Extraction
; Free radicals
; Gas chromatography
; Gases
; Interfaces (materials)
; Ionization of gases
; Mass spectrometry
; Oxidation
; Ozone
; Reflection
; Seawater
; Spectrometry
; Thin films
; Unsaturated compounds
; Air water interfaces
; Electrospray ionization mass spectrometry
; Gas phase oxidation
; Heterogeneous oxidation
; Mass spectrometry analysis
; OH radical
; Relative scattering
; X ray reflectivity
; Phase interfaces
; hydroxyl radical
; ozone
; sea water
; aerosol
; film
; heterogeneity
; hydroxyl radical
; inorganic matter
; oxidation
; ozone
; seawater
; X-ray diffraction
; aerosol
; aqueous solution
; Article
; electrospray mass spectrometry
; gas
; gas chromatography
; mass spectrometry
; oxidation
; priority journal
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: The heterogeneous oxidation of thin films of organic material extracted from real aerosol and sea-water samples was studied at the air-water interface using X-ray reflectivity. Oxidation of thin films of organic material extracted from real aerosol and sea-water is important in further understanding the impact of coated aerosols on the climate of the Earth. Surface active insoluble organic material extracted from the atmosphere was found to form stable films at the air-water interface (thickness measured as 10–14 nm). On exposure of the films to gas-phase ozone, no reaction (or change in the relative scattering length of the interface) was observed, indicating a potential lack of unsaturated organic material in the samples. Gas chromatography and electrospray ionization mass spectrometry showed the presence of saturated compounds in the samples. It is therefore proposed that the amount of unsaturated compounds as compared to saturated compounds in the atmospheric material is so low that the mass spectrometry analyses, as well as gas-phase oxidation are dominated by saturated material. A reaction was observed on exposure of the same films to aqueous phase hydroxyl and nitrate radicals and a film thinning mechanism is proposed to explain the change in scattering length of the film at the air-water interface. It can be suggested tentatively that oxidation by gas-phase ozone is not important in the atmosphere for organic films on aqueous atmospheric aerosol and that further studies should focus on radical induced oxidation of saturated organic material instead of unsaturated proxies that are typically studied. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82792
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey, United Kingdom; STFC, Central Laser Facility, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Oxford, Didcot, Oxfordshire, United Kingdom; Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden; Diamond Light Source, Harwell Campus, Didcot, Chilton, United Kingdom
Recommended Citation:
Jones S,H,, King M,et al. Are organic films from atmospheric aerosol and sea water inert to oxidation by ozone at the air-water interface?[J]. Atmospheric Environment,2017-01-01,161