气候变化领域集成服务门户(CCPortal): Characterization of secondary organic aerosol from heated-cooking-oil emissions: Evolution in composition and volatility

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DOI	10.5194/acp-21-5137-2021
	Characterization of secondary organic aerosol from heated-cooking-oil emissions: Evolution in composition and volatility
	Takhar M.; Li Y.; W. H. Chan A.
发表日期	2021
ISSN	1680-7316
起始页码	5137
结束页码	5149
卷号	21 期号:6
英文摘要	Cooking emissions account for a major fraction of urban organic aerosol. It is therefore important to understand the atmospheric evolution in the physical and chemical properties of organic compounds emitted from cooking activities. In this work, we investigate the formation of secondary organic aerosol (SOA) from oxidation of gas-phase organic compounds from heated cooking oil. The chemical composition of cooking SOA is analyzed using thermal desorption-gas chromatography-mass spectrometry (TD-GC-MS). While the particle-phase composition of SOA is a highly complex mixture, we adopt a new method to achieve molecular speciation of the SOA. All the GC-elutable material is classified by the constituent functional groups, allowing us to provide a molecular description of its chemical evolution upon oxidative aging. Our results demonstrate an increase in average oxidation state (from -0.6 to -0.24) and decrease in average carbon number (from 5.2 to 4.9) with increasing photochemical aging of cooking oil, suggesting that fragmentation reactions are key processes in the oxidative aging of cooking emissions within 2 d equivalent of ambient oxidant exposure. Moreover, we estimate that aldehyde precursors from cooking emissions account for a majority of the SOA formation and oxidation products. Overall, our results provide insights into the atmospheric evolution of cooking SOA, a majority of which is derived from gas-phase oxidation of aldehydes. © 2021 American Institute of Physics Inc.. All rights reserved.
语种	英语
scopus关键词	aerosol composition; aerosol formation; aldehyde; oxidant; oxidation; photochemistry; urban atmosphere
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247004
作者单位	Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, M5S3E5, Canada; College of Science, Sichuan Agricultural University, Ya'an, 625014, China
推荐引用方式 GB/T 7714	Takhar M.,Li Y.,W. H. Chan A.. Characterization of secondary organic aerosol from heated-cooking-oil emissions: Evolution in composition and volatility[J],2021,21(6).
APA	Takhar M.,Li Y.,&W. H. Chan A..(2021).Characterization of secondary organic aerosol from heated-cooking-oil emissions: Evolution in composition and volatility.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(6).
MLA	Takhar M.,et al."Characterization of secondary organic aerosol from heated-cooking-oil emissions: Evolution in composition and volatility".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.6(2021).