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DOI	10.5194/acp-22-9703-2022
	Oxygenated volatile organic compounds (VOCs) as significant but varied contributors to VOC emissions from vehicles
	Wang, Sihang; Yuan, Bin; Wu, Caihong; Wang, Chaomin; Li, Tiange; He, Xianjun; Huangfu, Yibo; Qi, Jipeng; Li, Xiao-Bing; Sha, Qing'e; Zhu, Manni; Lou, Shengrong; Wang, Hongli; Karl, Thomas; Graus, Martin; Yuan, Zibing; Shao, Min
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	9703
结束页码	9720
卷号	22 期号:14 页码:18
英文摘要	Vehicular emissions are an important source for volatile organic compounds (VOCs) in urban and downwind regions. In this study, we conducted a chassis dynamometer study to investigate VOC emissions from vehicles using gasoline, diesel, and liquefied petroleum gas (LPG) as fuel. Time-resolved VOC emissions from vehicles are chemically characterized by a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) with high frequency. Our results show that emission factors of VOCs generally decrease with the improvement of emission standards for gasoline vehicles, whereas variations in emission factors for diesel vehicles with emission standards are more diverse. Mass spectrum analysis of the PTR-ToF-MS suggests that cold starts significantly influence VOC emissions of gasoline vehicles, while the influences are less important for diesel vehicles. Large differences in VOC emissions between gasoline and diesel vehicles are observed with emission factors of most VOC species from diesel vehicles being higher than gasoline vehicles, especially for most oxygenated volatile organic compounds (OVOCs) and heavier aromatics. These results indicate quantification of heavier species by the PTR-ToF-MS may be important in the characterization of vehicular exhausts. Our results suggest that VOC pairs (e.g., C-14 aromatics / toluene ratio) could potentially provide good indicators for distinguishing emissions from gasoline and diesel vehicles. The fractions of OVOCs in total VOC emissions are determined by combining measurements of hydrocarbons from canisters and online observations of the PTR-ToF-MS. We show that OVOCs contribute 9.4 % +/- 5.6 % of total VOC emissions for gasoline vehicles, while the fractions are significantly higher for diesel vehicles (52 %-71 %), highlighting the importance of detecting these OVOC species in diesel emissions. Our study demonstrated that the large number of OVOC species measured by the PTR-ToF-MS are important in the characterization of VOC emissions from vehicles.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000833937300001
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/273641
作者单位	Jinan University; University of Innsbruck; South China University of Technology
推荐引用方式 GB/T 7714	Wang, Sihang,Yuan, Bin,Wu, Caihong,et al. Oxygenated volatile organic compounds (VOCs) as significant but varied contributors to VOC emissions from vehicles[J],2022,22(14):18.
APA	Wang, Sihang.,Yuan, Bin.,Wu, Caihong.,Wang, Chaomin.,Li, Tiange.,...&Shao, Min.(2022).Oxygenated volatile organic compounds (VOCs) as significant but varied contributors to VOC emissions from vehicles.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(14),18.
MLA	Wang, Sihang,et al."Oxygenated volatile organic compounds (VOCs) as significant but varied contributors to VOC emissions from vehicles".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.14(2022):18.