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DOI	10.1016/j.atmosenv.2021.118646
	Gas-phase brown carbon: Absorbance and chromophore types
	Chen Q.; Chen Q.; Hua X.; Guan D.; Chang T.
发表日期	2021
ISSN	1352-2310
卷号	264
英文摘要	Brown carbon (BrC) is recognized as an important contributor of global warming because it can effectively absorb solar radiation in the atmosphere. Up to now, most studies mainly focused on the properties of particle-phase brown carbon (BrC-PP). The optical characteristics and environmental impacts of gas-phase brown carbon (BrC-GP) are rarely investigated. To address this knowledge gap, the BrC-PP and BrC-GP were collected simultaneously from the ambient air in an urban area for half a month in summer of 2019. The samples were extracted by methanol and were analyzed both using the UV–visible spectroscopy and the excitation-emission matrix (EEM) fluorescence spectroscopy for their optical properties and chemical compositions. The results showed that the light absorption of BrC-GP was comparable with that of BrC-PP. The BrC-GP can contribute ~40% of the total light absorption by methanol-extracted BrC at the short wavelength of 400 nm. However, no significant correlation was found between BrC-GP and BrC-PP in terms of the light-absorption. It was surprising that the BrC-GP accounted for 80% of the total fluorescence volume. EEM-PARAFAC analysis showed that the BrC-PP was mainly composed of humic-like substances, while the BrC-GP was rich in phenol- and protein-like substances. Further extensive studies on the content, reactivity and seasonal trends of BrC-GP are required to clarify their environmental impacts. © 2021 Elsevier Ltd
关键词	Brown carbon Gas phase Global warming Particle phase Photochemistry
语种	英语
scopus关键词	Bromine compounds; Carbon; Chemical analysis; Chromophores; Environmental impact; Extraction; Fluorescence; Fluorescence spectroscopy; Global warming; Light absorption; Methanol; Optical properties; Photochemical reactions; Solar energy; Absorbances; Ambient air; Brown carbons; Gas-phases; Knowledge gaps; Optical characteristics; Particle phase; Property; Urban areas; UV-visible spectroscopy; Gases; carbon; methanol; phenol; protein; absorbance; ambient air; detection method; environmental impact; gas phase reaction; global warming; urban area; wavelength; air sampling; ambient air; chemical composition; chromatophore; controlled study; excitation; gas; humic substance; light absorption; optics; spectrofluorometry; summer; ultraviolet visible spectroscopy; urban area
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/248243
作者单位	School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China
推荐引用方式 GB/T 7714	Chen Q.,Chen Q.,Hua X.,et al. Gas-phase brown carbon: Absorbance and chromophore types[J],2021,264.
APA	Chen Q.,Chen Q.,Hua X.,Guan D.,&Chang T..(2021).Gas-phase brown carbon: Absorbance and chromophore types.ATMOSPHERIC ENVIRONMENT,264.
MLA	Chen Q.,et al."Gas-phase brown carbon: Absorbance and chromophore types".ATMOSPHERIC ENVIRONMENT 264(2021).