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DOI	10.5194/acp-19-13591-2019
	Secondary organic aerosol formation from photooxidation of furan: Effects of NOxand humidity
	Jiang X.; Tsona N.T.; Jia L.; Liu S.; Zhang H.; Xu Y.; Du L.
发表日期	2019
ISSN	16807316
起始页码	13591
结束页码	13609
卷号	19 期号:21
英文摘要	Atmospheric furan is a primary and secondary pollutant in the atmosphere, and its emission contributes to the formation of ultrafine particles. We investigate the effects of NOx level and humidity on the formation of secondary organic aerosol (SOA) generated from the photooxidation of furan in the presence of NaCl seed particles. SOA mass concentration and yield were determined under different NOx and humidity levels. A significant difference is observed both in the variation of SOA mass concentration and SOA yield with the initial experimental conditions. Varying VOC (volatile organic compound) =NOx ratios over the range 48.1 to 8.2 contributes to the effective formation of SOA in the presence of NaCl seed particles, with the SOA mass concentration and SOA yield ranging from 0.96 to 23.46 -gm-3 and from 0.04% to 1.01 %, respectively. We found that there was a favourable relationship between the SOA yields and NOx concentration. In particular, the increase in SOA yield with increasing NOx concentration was continuously observed at high NOx levels owing to a corresponding increase in the amount of low-volatility hydroxyl nitrates and dihydroxyl dinitrates that can partition into the particle phase. In addition, varying relative humidity (RH) from 5% to 88% increased the SOA yield from 1.01% to 5.03 %. The enhanced SOA formation from humid conditions may result from the high OH concentration, rapid furan decay rate, enhanced carbonyl-rich products condensation, and the aqueous-phase reactions. Using hybrid quadrupoleorbitrap mass spectrometer equipped with electrospray ionization (HESI-Q Exactive-Orbitrap MS), three carbonyl-rich products and three kinds of organonitrates were identified in the collected SOA. Based on the HESI-Q Exactive-Orbitrap MS analysis and Fourier transform infrared spectroscopy (FTIR), the reaction mechanism of furan photooxidation was proposed. This study demonstrates the effects of NOx and humidity on SOA formation during the furan NOx NaCl photooxidation and provides new insights into the oxidation regime and SOA composition in furan photooxidation. The results also illustrate the importance of studying SOA formation over a comprehensive range of environmental conditions. Only such evaluations can induce meaningful SOA mechanisms to be implemented in air quality models. © Author(s) 2019.
语种	英语
scopus关键词	aerosol; air quality; atmospheric modeling; concentration (composition); formation mechanism; furan; humidity; nitrogen oxides; photooxidation
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/144053
作者单位	Environment Research Institute, Shandong University, Qingdao, 266237, China; State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
推荐引用方式 GB/T 7714	Jiang X.,Tsona N.T.,Jia L.,et al. Secondary organic aerosol formation from photooxidation of furan: Effects of NOxand humidity[J],2019,19(21).
APA	Jiang X..,Tsona N.T..,Jia L..,Liu S..,Zhang H..,...&Du L..(2019).Secondary organic aerosol formation from photooxidation of furan: Effects of NOxand humidity.Atmospheric Chemistry and Physics,19(21).
MLA	Jiang X.,et al."Secondary organic aerosol formation from photooxidation of furan: Effects of NOxand humidity".Atmospheric Chemistry and Physics 19.21(2019).