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DOI	10.1016/j.atmosenv.2020.117560
	The influence of SO2 as the Criegee intermediate scavenger on the heterogeneous oxidation of oleic acid
	Yang M.; Ma S.-S.; Ashraf H.; Pang S.-F.; Zhang Y.-H.
发表日期	2020
ISSN	1352-2310
卷号	231
英文摘要	As a well-known Criegee intermediate (CI) scavenger, SO2 can react with CIs in the gas phase to form sulphuric acid, which can be further converted to sulfate aerosols, which make an important contribution to haze formation. Despite the potential importance, the interaction of SO2 with the CIs produced by heterogeneous oxidation of unsaturated fatty acids remains largely unclear. In this work, the heterogeneous reactions of oleic acid (OA) thin films with O3 and O3/SO2 mixture gases are studied under four different relative humidities (RHs): 5%, 30%, 60% and 80%, using microscopic Fourier transform infrared (micro-FTIR) spectrometer combined with a gas-flow system. A detailed comparison on formation rates of ester and intensity ratios of 1742 cm−1 band (envelope C[dbnd]O of ester) to 1712 cm−1 band (feature C[dbnd]O of carboxyl) between the two reaction systems shows that the addition of SO2 inhibits the conversion of carboxyl to ester at any RH. As the SO2 concentration increases, the formation rates and final relative amount of ester decrease. Based on these data, it can be concluded that SO2 consumes part condensed-phase CIs produced by ozonolysis of OA, resulting in a significant inhibition in ester formation. The present results provide an important atmospheric implication on the reaction between SO2 and condensed-phase CIs, which may be a missing sulfate production pathway in the atmosphere. © 2020
关键词	Condensed-phase CIs Heterogeneous oxidation Inhibition Oleic acid SO2
语种	英语
scopus关键词	Atmospheric humidity; Esters; Flow of gases; Fourier transform infrared spectroscopy; Gases; Oleic acid; Ozone; Reaction rates; Sulfur compounds; Unsaturated fatty acids; Atmospheric implications; Criegee intermediates; Fourier transform infra reds; Gas flow systems; Heterogeneous oxidation; Heterogeneous reactions; Sulfate aerosols; Sulfate production; Reaction intermediates; ester; oleic acid; ozone; scavenger; sulfate; sulfuric acid; atmospheric chemistry; chemical compound; ester; inhibition; oxidation; scavenging (chemistry); sulfur dioxide; sulfuric acid; Article; comparative study; concentration (parameter); controlled study; esterification; Fourier transform infrared spectroscopy; gas; oxidation; ozonolysis; polymerization; priority journal; troposphere
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249150
作者单位	The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China
推荐引用方式 GB/T 7714	Yang M.,Ma S.-S.,Ashraf H.,et al. The influence of SO2 as the Criegee intermediate scavenger on the heterogeneous oxidation of oleic acid[J],2020,231.
APA	Yang M.,Ma S.-S.,Ashraf H.,Pang S.-F.,&Zhang Y.-H..(2020).The influence of SO2 as the Criegee intermediate scavenger on the heterogeneous oxidation of oleic acid.ATMOSPHERIC ENVIRONMENT,231.
MLA	Yang M.,et al."The influence of SO2 as the Criegee intermediate scavenger on the heterogeneous oxidation of oleic acid".ATMOSPHERIC ENVIRONMENT 231(2020).