气候变化领域集成服务门户(CCPortal): Polar semivolatile organic compounds in biomass-burning emissions and their chemical transformations during aging in an oxidation flow reactor

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DOI	10.5194/acp-20-8227-2020
	Polar semivolatile organic compounds in biomass-burning emissions and their chemical transformations during aging in an oxidation flow reactor
	Sengupta D.; Samburova V.; Bhattarai C.; Watts A.C.; Moosmüller H.; Khlystov A.Y.
发表日期	2020
ISSN	1680-7316
起始页码	8227
结束页码	8250
卷号	20 期号:13
英文摘要	Semivolatile organic compounds (SVOCs) emitted from open biomass burning (BB) can contribute to chemical and physical properties of atmospheric aerosols and also may cause adverse health effects. The polar fraction of SVOCs is a prominent part of BB organic aerosols, and thus it is important to characterize the chemical composition and reactivity of this fraction. In this study, globally and regionally important representative fuels (Alaskan peat, Moscow peat, Pskov peat, eucalyptus, Malaysian peat, and Malaysian agricultural peat) were burned under controlled conditions using the combustion chamber facility at the Desert Research Institute (DRI). Gas- and particle-phase biomass-burning emissions were aged in an oxidation flow reactor (OFR) to mimic 5-7 d of atmospheric aging. Fresh and OFR-aged biomass-burning aerosols were collected on Teflon-impregnated glass fiber filters (TIGF) in tandem with XAD resin media for organic carbon speciation. The polar fraction extracted with dichloromethane and acetone was analyzed with gas chromatography mass spectrometry (GC-MS) for 84 polar organic compounds - including mono- and dicarboxylic acids, methoxylated phenols, aromatic acids, anhydrosugars, resin acids, and sterols. For all these compounds, fuel-based emission factors (EFs) were calculated for fresh and OFR-aged samples. The carbon mass of the quantified polar compounds was found to constitute 5 % to 7 % of the total organic compound mass. A high abundance of methoxyphenols (239 mg kgspan classCombining double low line"inline-formula"-1/span for Pskov peat; 22.6 % of total GC-MS characterized mass) and resin acids (118 mg kgspan classCombining double low line"inline-formula"-1/span for Alaskan peat; 14.5 % of total GC-MS characterized mass) was found in peat-burning emissions (smoldering combustion). The concentration of some organic compounds (e.g., tetracosanoic acid) with a molecular weight (MW) above 350 g molspan classCombining double low line"inline-formula"-1/span decreased after OFR aging, while abundances of low-MW compounds (e.g., hexanoic acid) increased. This indicated a significant extent of fragmentation reactions in the OFR. Methoxyphenols decreased after OFR aging, while a significant increase (3.7 to 8.6 times) in the abundance of dicarboxylic acids emission factors (EFs), especially maleic acid (10 to 60 times), was observed. EFs for fresh and ratios from fresh-to-aged BB samples reported in this study can be used to perform source apportionment and predict processes occurring during atmospheric transport.. © 2020 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	aerosol composition; aerosol property; atmospheric transport; biomass burning; chemical composition; emission inventory; fragmentation; fuel consumption; oxidation; peat; polar region; source apportionment; volatile organic compound; Eucalyptus
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/247652
作者单位	Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512, United States
推荐引用方式 GB/T 7714	Sengupta D.,Samburova V.,Bhattarai C.,et al. Polar semivolatile organic compounds in biomass-burning emissions and their chemical transformations during aging in an oxidation flow reactor[J],2020,20(13).
APA	Sengupta D.,Samburova V.,Bhattarai C.,Watts A.C.,Moosmüller H.,&Khlystov A.Y..(2020).Polar semivolatile organic compounds in biomass-burning emissions and their chemical transformations during aging in an oxidation flow reactor.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(13).
MLA	Sengupta D.,et al."Polar semivolatile organic compounds in biomass-burning emissions and their chemical transformations during aging in an oxidation flow reactor".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.13(2020).