Formation mechanism of secondary organic aerosol from ozonolysis of gasoline vehicle exhaust

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	Formation mechanism of secondary organic aerosol from ozonolysis of gasoline vehicle exhaust
	Zhang, Haixu; Ma, Pengkun; Zhang, Peng; Yang, Bo; Shu, Jinian; Huang, Jingyun
刊名	ENVIRONMENTAL POLLUTION
	2018-03-01
卷号	234 页码:960-968
关键词	Ozone Oligomer Secondary organic aerosols Vehicle exhaust Mass spectrometer
ISSN号	0269-7491
文献子类	Article
英文摘要	Gasoline vehicles are a major source of anthropogenic secondary organic aerosols (SUM). However, current models based on known precursors fail to explain the substantial SOAs from vehicle emissions due to the inadequate understanding of the formation mechanism. To provide more information on this issue, the formation of SOAs from ozonolysis of four light-duty gasoline vehicle exhaust systems was investigated with a vacuum ultraviolet photoionization mass spectrometer (VUV-PIMS). Remarkable SOAs formation was observed and the SOAs were primarily aliphatic alkenes. PI mass spectra of the SOAs from all vehicles exhibited similar spectral patterns (a regular mass group with m/z at 98, 112, 126 ...). Interestingly, most carbonyl products of aliphatic alkenes observed as major gaseous products have specific molecular weights, and the main formation pathway of SOAs can be explained well using aldol condensation reactions of these carbonyls. This is a direct observation of the aldol condensation as a dominated pathway for SOAs formation, and the first report on the composition and formation mechanism of the SOAs from the ozonolysis of gasoline vehicle exhaust is given. The study reveals that low molecular weight alkenes may play a more significant role in vehicle-induced SOAs formation than previously believed. More importantly, the PI mass spectra of SOAs from vehicles show similarities to the field aerosol sample mass spectra, suggesting the possible significance of the aldol condensation reactions in ambient aerosol formation. Since carbonyls are a major degradation product of biogenic and anthropogenic VOCs through atmospheric oxidation processes, the mechanism proposed in this study can be applied more generally to explain aerosol formation from the oxidation of atmospheric hydrocarbons. (C) 2017 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/41147]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Zhang, Haixu,Ma, Pengkun,Zhang, Peng,et al. Formation mechanism of secondary organic aerosol from ozonolysis of gasoline vehicle exhaust[J]. ENVIRONMENTAL POLLUTION,2018,234:960-968.
APA	Zhang, Haixu,Ma, Pengkun,Zhang, Peng,Yang, Bo,Shu, Jinian,&Huang, Jingyun.(2018).Formation mechanism of secondary organic aerosol from ozonolysis of gasoline vehicle exhaust.ENVIRONMENTAL POLLUTION,234,960-968.
MLA	Zhang, Haixu,et al."Formation mechanism of secondary organic aerosol from ozonolysis of gasoline vehicle exhaust".ENVIRONMENTAL POLLUTION 234(2018):960-968.