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DOI	10.5194/acp-21-12141-2021
	Gas-particle partitioning of polyol tracers at a suburban site in Nanjing, east China: Increased partitioning to the particle phase
	Qin C.; Gou Y.; Wang Y.; Mao Y.; Liao H.; Wang Q.; Xie M.
发表日期	2021
ISSN	1680-7316
起始页码	12141
结束页码	12153
卷号	21 期号:15
英文摘要	Gas-particle partitioning of water-soluble organic compounds plays a significant role in influencing the formation, transport, and lifetime of organic aerosols in the atmosphere, but is poorly characterized. In this work, gas- and particle-phase concentrations of isoprene oxidation products (C5-alkene triols and 2-methylterols), levoglucosan, and sugar polyols were measured simultaneously at a suburban site of the western Yangtze River Delta in east China. All target polyols were primarily distributed into the particle phase (85.9ĝ€¯%-99.8ĝ€¯%). Given the uncertainties in measurements and vapor pressure predictions, a dependence of particle-phase fractions on vapor pressures cannot be determined. To explore the impact of aerosol liquid water on gas-particle partitioning of polyol tracers, three partitioning schemes (Cases 1-3) were proposed based on equilibriums of gas vs. organic and aqueous phases in aerosols. If particulate organic matter (OM) is presumed as the only absorbing phase (Case 1), the measurement-based absorptive partitioning coefficients (Kp,OMm) of isoprene oxidation products and levoglucosan were more than 10 times greater than predicted values (Kp,OMt). The agreement between Kp,OMm and Kp,OMt was substantially improved when solubility in a separate aqueous phase was included, whenever water-soluble and water-insoluble OM partitioned into separate (Case 2) or single (Case 3) liquid phases, suggesting that the partitioning of polyol tracers into the aqueous phase in aerosols should not be ignored. The measurement-based effective Henry's law coefficients (KH,em) of polyol tracers were orders of magnitude higher than their predicted values in pure water (KH,wt). Due to the moderate correlations between logĝ (KH,em/KH,wt) and molality of sulfate ions, the gap between KH,em and KH,wt of polyol tracers could not be fully parameterized by the equation defining "salting-in"effects and might be ascribed to mechanisms of reactive uptake, aqueous phase reaction, "like-dissolves-like"principle, etc. These study results also partly reveal the discrepancy between observation and modeling of organic aerosols. © 2021 The Author(s).
语种	英语
scopus关键词	concentration (composition); isoprene; oxidation; particulate matter; partitioning; suburban area; tracer; China; Jiangsu; Nanjing [Jiangsu]; Yangtze Delta
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/246657
作者单位	Colleges of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, 219 Ningliu Road, Nanjing, 210044, China; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States; State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China
推荐引用方式 GB/T 7714	Qin C.,Gou Y.,Wang Y.,et al. Gas-particle partitioning of polyol tracers at a suburban site in Nanjing, east China: Increased partitioning to the particle phase[J],2021,21(15).
APA	Qin C..,Gou Y..,Wang Y..,Mao Y..,Liao H..,...&Xie M..(2021).Gas-particle partitioning of polyol tracers at a suburban site in Nanjing, east China: Increased partitioning to the particle phase.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(15).
MLA	Qin C.,et al."Gas-particle partitioning of polyol tracers at a suburban site in Nanjing, east China: Increased partitioning to the particle phase".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.15(2021).