气候变化领域集成服务门户(CCPortal): Technical note: Chemical composition and source identification offluorescent components in atmospheric water-soluble brown carbon byexcitation-emission matrix spectroscopy with parallel factor analysis

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DOI	10.5194/acp-23-2613-2023
	Technical note: Chemical composition and source identification offluorescent components in atmospheric water-soluble brown carbon byexcitation-emission matrix spectroscopy with parallel factor analysis - potentiallimitations and applications
	Cao, Tao; Li, Meiju; Xu, Cuncun; Song, Jianzhong; Fan, Xingjun; Li, Jun; Jia, Wanglu; Peng, Ping'an
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	2613
结束页码	2625
卷号	23 期号:4 页码:13
英文摘要	Three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy is an important method for the identification of the occurrence, chemical composition, and source of atmospheric chromophores. However, current knowledge on the identification and interpretation of fluorescent components is mainly based on aquatic dissolved organic matter and might not be applicable to atmospheric samples. Therefore, this study comprehensively investigated EEM data of different types of strong light-absorbing organic compounds, water-soluble organic matter (WSOM) in different aerosol samples (combustion source samples and ambient aerosols), soil dust, and purified fulvic and humic acids supplemented by parallel factor (PARAFAC) modeling. The results demonstrated that organic compounds with high aromaticity and strong electron-donating groups generally present strong fluorescence spectra at longer emission wavelengths, whereas organic compounds substituted with electron-withdrawing groups have relatively weaker fluorescence intensity. In particular, aromatic compounds containing nitro groups (i.e., nitrophenols), which show strong absorption and are the major component of atmospheric brown carbon, exhibited no significant fluorescence. The EEM-PARAFAC method identified three fluorescent components (i.e., C1, C2, and C3) in ambient WSOM. Although EEM-PARAFAC-derived C1 (Ex/Em = 235, 270/330 nm) in ambient WSOM is generally considered to be protein-like groups, our findings suggested that it is mainly composed of aromatic acids, phenolic compounds, and their derivatives, with only traces of amino acids. C2 is associated with the atmospheric chemical reaction of biomass burning and/or biogenic organic molecules, with a relatively lower degree of oxidation, which are more abundant in Guangzhou WSOM (56 %-69 %). C3, in contrast, is mainly attributed to highly oxygenated organic molecules derived from soil and atmospheric aging processes and has a relatively higher contribution in Chuzhou WSOM (23 %). These findings provide new insights into the analysis of chemical properties and sources of atmospheric fluorophores using the EEM method.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000938116600001
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/273002
作者单位	Chinese Academy of Sciences; Guangzhou Institute of Geochemistry, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Anhui Science & Technology University
推荐引用方式 GB/T 7714	Cao, Tao,Li, Meiju,Xu, Cuncun,et al. Technical note: Chemical composition and source identification offluorescent components in atmospheric water-soluble brown carbon byexcitation-emission matrix spectroscopy with parallel factor analysis - potentiallimitations and applications[J],2023,23(4):13.
APA	Cao, Tao.,Li, Meiju.,Xu, Cuncun.,Song, Jianzhong.,Fan, Xingjun.,...&Peng, Ping'an.(2023).Technical note: Chemical composition and source identification offluorescent components in atmospheric water-soluble brown carbon byexcitation-emission matrix spectroscopy with parallel factor analysis - potentiallimitations and applications.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(4),13.
MLA	Cao, Tao,et al."Technical note: Chemical composition and source identification offluorescent components in atmospheric water-soluble brown carbon byexcitation-emission matrix spectroscopy with parallel factor analysis - potentiallimitations and applications".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.4(2023):13.