Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-7593-2017 |
Particle size dependence of biogenic secondary organic aerosol molecular composition | |
Tu, Peijun; Johnston, Murray V. | |
2017-06-22 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:12 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Formation of secondary organic aerosol (SOA) is initiated by the oxidation of volatile organic compounds (VOCs) in the gas phase whose products subsequently partition to the particle phase. Non-volatile molecules have a negligible evaporation rate and grow particles at their condensation rate. Semi-volatile molecules have a significant evaporation rate and grow particles at a much slower rate than their condensation rate. Particle phase chemistry may enhance particle growth if it transforms partitioned semi-volatile molecules into non-volatile products. In principle, changes in molecular composition as a function of particle size allow non-volatile molecules that have condensed from the gas phase (a surface-limited process) to be distinguished from those produced by particle phase reaction (a volume-limited process). In this work, SOA was produced by beta-pinene ozonolysis in a flow tube reactor. Aerosol exiting the reactor was size-selected with a differential mobility analyzer, and individual particle sizes between 35 and 110 nm in diameter were characterized by on-and offline mass spectrometry. Both the average oxygen-to-carbon (O/C) ratio and carbon oxidation state (OSc) were found to decrease with increasing particle size, while the relative signal intensity of oligomers increased with increasing particle size. These results are consistent with oligomer formation primarily in the particle phase (accretion reactions, which become more favored as the volume-to-surface-area ratio of the particle increases). Analysis of a series of polydisperse SOA samples showed similar dependencies: as the mass loading increased (and average volume-to-surface-area ratio increased), the average O/C ratio and OSc decreased, while the relative intensity of oligomer ions increased. The results illustrate the potential impact that particle phase chemistry can have on biogenic SOA formation and the particle size range where this chemistry becomes important. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000404049500006 |
WOS关键词 | ALPHA-PINENE ; ACCRETION REACTIONS ; PARTICULATE MATTER ; FORMATION PATHWAYS ; OLIGOMER CONTENT ; PEROXY-RADICALS ; PHASE-STATE ; GROWTH ; OZONOLYSIS ; NANOPARTICLES |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29490 |
专题 | 地球科学 |
作者单位 | Univ Delaware, Dept Chem & Biochem, Newark, DE 19716 USA |
推荐引用方式 GB/T 7714 | Tu, Peijun,Johnston, Murray V.. Particle size dependence of biogenic secondary organic aerosol molecular composition[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(12). |
APA | Tu, Peijun,&Johnston, Murray V..(2017).Particle size dependence of biogenic secondary organic aerosol molecular composition.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(12). |
MLA | Tu, Peijun,et al."Particle size dependence of biogenic secondary organic aerosol molecular composition".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.12(2017). |
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