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J Environ Sci (China)

Title:		Wall losses of oxygenated volatile organic compounds from oxidation of toluene: Effects of chamber volume and relative humidity
Author(s):		Yu S; Jia L; Xu Y; Zhang H; Zhang Q; Pan Y;
Address:		"State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; Department of Atmospheric Chemistry and Environmental Sciences, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; Department of Atmospheric Chemistry and Environmental Sciences, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: jialong@mail.iap.ac.cn"
Journal Title:		J Environ Sci (China)
Year:		2022
Volume:		20220222
Issue:
Page Number:		475 - 484
DOI:		10.1016/j.jes.2021.09.026
ISSN/ISBN:		1001-0742 (Print) 1001-0742 (Linking)
Abstract:		"Vapor wall losses can affect the yields of secondary organic aerosol. The effects of surface-to-volume (S/V) ratio and relative humidity (RH) on the vapor-wall interactions were investigated in this study. The oxygenated volatile organic compounds (OVOCs) were generated from toluene-H(2)O(2) irradiations. The average gas to wall loss rate constant (k(gw)) of OVOCs in a 400 L reactor (S/V = 7.5 m(-1)) is 2.47 (2.41 under humid conditions) times higher than that in a 5000 L reactor (S/V = 3.6 m(-1)) under dry conditions. In contrast, the average desorption rate constant (k(wg)) of OVOCs in 400 L reactor is only 1.37 (1.20 under humid conditions) times higher than that in 5000 L reactor under dry conditions. It shows that increasing the S/V ratio can promote the wall losses of OVOCs. By contrast, the RH effect on k(gw) is not prominent. The average k(gw) value under humid conditions is almost the same as under dry conditions in the 400 L (5000 L) reactor. However, increasing RH can decrease the desorption rates. The average k(wg) value under dry conditions is 1.45 (1.27) times higher than that under humid conditions in the 400 L (5000 L) reactor. The high RH can increase the partitioning equilibrium timescales and enhance the wall losses of OVOCs"
Keywords:		Aerosols Gases Humidity Hydrogen Peroxide Toluene *Volatile Organic Compounds Oxygenated volatile organic compounds Relative humidity Smog chamber Surface-to-volume ratio Vapor wall loss;
Notes:		"MedlineYu, Shanshan Jia, Long Xu, Yongfu Zhang, Hailiang Zhang, Qun Pan, Yuepeng eng Netherlands 2022/04/24 J Environ Sci (China). 2022 Apr; 114:475-484. doi: 10.1016/j.jes.2021.09.026. Epub 2022 Feb 22"