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Sci Total Environ

Title:		Links between the optical properties and chemical compositions of brown carbon chromophores in different environments: Contributions and formation of functionalized aromatic compounds
Author(s):		Li X; Hu M; Wang Y; Xu N; Fan H; Zong T; Wu Z; Guo S; Zhu W; Chen S; Dong H; Zeng L; Yu X; Tang X;
Address:		"State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing, China; Beijing Innovation Center for Engineering Sciences and Advanced Technology, Peking University, Beijing, China. Electronic address: minhu@pku.edu.cn. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing, China"
Journal Title:		Sci Total Environ
Year:		2021
Volume:		20210504
Issue:
Page Number:		147418 -
DOI:		10.1016/j.scitotenv.2021.147418
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Links between the optical properties and chemical compositions of brown carbon (BrC) are poorly understood because of the complexity of BrC chromophores. We conducted field studies simultaneously at both vehicle-influenced site and biomass burning-affected site in China in polluted winter. The chemical compositions and light absorption values of functionalized aromatic compounds, including phenyl aldehyde, phenyl acid, and nitroaromatic compounds, were measured. P-phthalic acid, nitrophenols and nitrocatechols were dominant BrC species, accounting for over 50% of the concentration of identified chromophores. Nitrophenols and nitrocatechols contributed more than 50% of the identified BrC absorbance between 300 and 400 nm. Oxidation of biomass burning-related products (e.g., pyrocatechol and methylcatechols) and anthropogenic volatile organic compounds (e.g., benzene and toluene) generated similar BrC chromophores, implying that these functionalized aromatic compounds play an important role in both environments. Compared with the biomass burning-affected site (22%), functionalized aromatic compounds at vehicle-influenced site accounted for a higher percentage of BrC absorption (25%). This research improves our understanding of the links between optical properties and composition of BrC, and the difference between BrC chromophores from BB-influenced area and vehicle-affected area under polluted atmospheric conditions"
Keywords:		Brown carbon Chemical compositions Chromophores Functionalized aromatic compounds Optical properties;
Notes:		"PubMed-not-MEDLINELi, Xiao Hu, Min Wang, Yujue Xu, Nan Fan, Hanyun Zong, Taomou Wu, Zhijun Guo, Song Zhu, Wenfei Chen, Shiyi Dong, Huabin Zeng, Limin Yu, Xuena Tang, Xiaoyan eng Netherlands 2021/05/12 Sci Total Environ. 2021 Sep 10; 786:147418. doi: 10.1016/j.scitotenv.2021.147418. Epub 2021 May 4"