气候变化领域集成服务门户(CCPortal): Chemical composition, optical properties, and oxidative potential of water-and methanol-soluble organic compounds emitted from the combustion of biomass materials and coal

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DOI	10.5194/acp-21-13187-2021
	Chemical composition, optical properties, and oxidative potential of water-and methanol-soluble organic compounds emitted from the combustion of biomass materials and coal
	Cao T.; Li M.; Zou C.; Fan X.; Song J.; Jia W.; Yu C.; Yu Z.; Peng P.
发表日期	2021
ISSN	1680-7316
起始页码	13187
结束页码	13205
卷号	21 期号:17
英文摘要	Biomass burning (BB) and coal combustion (CC) are important sources of brown carbon (BrC) in ambient aerosols. In this study, six biomass materials and five types of coal were combusted to generate fine smoke particles. The BrC fractions, including water-soluble organic carbon (WSOC), humic-like substance carbon (HULIS-C), and methanol-soluble organic carbon (MSOC), were subsequently fractionated, and their optical properties and chemical structures were then comprehensively investigated using UV-visible spectroscopy, proton nuclear magnetic resonance spectroscopy (1H NMR), and fluorescence excitation-emission matrix (EEM) spectroscopy combined with parallel factor (PARAFAC) analysis. In addition, the oxidative potential (OP) of BB and CC BrC was measured with the dithiothreitol (DTT) method. The results showed that WSOC, HULIS-C, and MSOC accounted for 2.3g %-22g %, 0.5g %-10g %, and 6.4g %-73g % of the total mass of combustion-derived smoke PM2.5, respectively, with MSOC extracting the highest concentrations of organic compounds. The MSOC fractions had the highest light absorption capacity (mass absorption efficiency at 365g nm (MAE365): 1.0-2.7g m2/gC) for both BB and CC smoke, indicating that MSOC contained more of the strong light-Absorbing components. Therefore, MSOC may represent the total BrC better than the water-soluble fractions. Some significant differences were observed between the BrC fractions emitted from BB and CC with more water-soluble BrC fractions with higher MAE365 and lower absorption Ångström exponent values detected in smoke emitted from BB than from CC. EEM-PARAFAC identified four fluorophores: Two protein-like, one humic-like, and one polyphenol-like fluorophores. The protein-like substances were the dominant components of WSOC (47g %-80g %), HULIS-C (44g %-87g %), and MSOC (42g %-70g %). The 1H-NMR results suggested that BB BrC contained more oxygenated aliphatic functional groups (H-C-O), whereas CC BrC contained more unsaturated fractions (H-C-CCombining double low line and Ar-H). The DTT assays indicated that BB BrC generally had a stronger oxidative potential (DTTm, 2.6-85g pmol/min/μg) than CC BrC (DTTm, 0.4-11g pmol/min/μg), with MSOC having a stronger OP than WSOC and HULIS-C. In addition, HULIS-C contributed more than half of the DTT activity of WSOC (63.1g %g ±g 15.5g %), highlighting that HULIS was a major contributor of reactive oxygen species (ROS) production in WSOC. Furthermore, the principal component analysis and Pearson correlation coefficients indicated that highly oxygenated humic-like fluorophore C4 may be the important DTT active substances in BrC. © 2021 The Author(s).
语种	英语
scopus关键词	aerosol; biomass burning; chemical composition; coal; combustion; methanol; nuclear magnetic resonance; optical property; organic compound; oxidative stress; principal component analysis
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/246605
作者单位	State Key Lab. of Organ. Geochem. and Guangdong Prov. Key Lab. of Environ. Protect. and Rsrc. Utiliz., Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; Cas Center for Excellence in Deep Earth Science, Guangzhou, 510640, China; University of Chinese Academy of Sciences, Beijing, 100049, China; College of Resource and Environment, Anhui Science and Technology University, Anhui, 233100, China; Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou, 510640, China
推荐引用方式 GB/T 7714	Cao T.,Li M.,Zou C.,et al. Chemical composition, optical properties, and oxidative potential of water-and methanol-soluble organic compounds emitted from the combustion of biomass materials and coal[J],2021,21(17).
APA	Cao T..,Li M..,Zou C..,Fan X..,Song J..,...&Peng P..(2021).Chemical composition, optical properties, and oxidative potential of water-and methanol-soluble organic compounds emitted from the combustion of biomass materials and coal.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(17).
MLA	Cao T.,et al."Chemical composition, optical properties, and oxidative potential of water-and methanol-soluble organic compounds emitted from the combustion of biomass materials and coal".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.17(2021).