气候变化领域集成服务门户(CCPortal): Molecular Characterization of Organosulfates in Highly Polluted Atmosphere Using Ultra-High-Resolution Mass Spectrometry

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DOI	10.1029/2019JD032253
	Molecular Characterization of Organosulfates in Highly Polluted Atmosphere Using Ultra-High-Resolution Mass Spectrometry
	Cai D.; Wang X.; Chen J.; Li X.
发表日期	2020
ISSN	2169897X
卷号	125 期号:8
英文摘要	Organosulfates (OSs) have recently been observed to be a potentially important constituent of secondary organic aerosol (SOA); however, their molecular characterization in highly polluted atmospheres has not been probed in detail. This study thoroughly presents the characterization of OSs in polluted air and demonstrates their seasonal and diurnal variations, formation mechanisms, and contributions to organic aerosol. Atmospheric PM2.5 samples were collected from an urban Shanghai site across the winter and summer of 2017. OSs were characterized by ultra-high-performance liquid chromatography (UHPLC) coupled with Orbitrap mass spectrometry (MS). Based on exact mass formulae in conjunction with previous chamber studies, hundreds of sulfur-containing compounds were tentatively identified as OSs. The number and abundance of OSs increased significantly during pollution episodes. The OSs in the clean aerosol samples were dominant in biogenic products, whereas the OSs in the polluted winter samples had distinctive anthropogenic characteristics. Aromatics and long-chain alkanes from anthropogenic emissions might be their precursors. By using synthesized standards, the total concentrations of 14 quantified OSs ranged 21.6–161 ng m−3 in summer and 5.85–84.3 ng m−3 in winter, respectively. Among these OSs, glycolic acid sulfate was the most abundant species (1.13–122 ng m−3). Further analysis of their seasonal and diurnal variations suggests possible contributions from multiple formation mechanisms, including acid-catalyzed and NO3-initiated oxidation reactions. Our results highlight that increased anthropogenic pollutant emissions (e.g., NOx and SO2) can significantly enhance the SOA burden in biogenically influenced urban areas. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Formation mechanism; Molecular Characterization; Organosulfates; ultra-high-resolution mass spectrometry
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186045
作者单位	Department of Environmental Science and Engineering, Fudan University, Shanghai, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, China; Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, Villeurbanne, France
推荐引用方式 GB/T 7714	Cai D.,Wang X.,Chen J.,et al. Molecular Characterization of Organosulfates in Highly Polluted Atmosphere Using Ultra-High-Resolution Mass Spectrometry[J],2020,125(8).
APA	Cai D.,Wang X.,Chen J.,&Li X..(2020).Molecular Characterization of Organosulfates in Highly Polluted Atmosphere Using Ultra-High-Resolution Mass Spectrometry.Journal of Geophysical Research: Atmospheres,125(8).
MLA	Cai D.,et al."Molecular Characterization of Organosulfates in Highly Polluted Atmosphere Using Ultra-High-Resolution Mass Spectrometry".Journal of Geophysical Research: Atmospheres 125.8(2020).