@article {27060,
	title = {Links between the optical properties and chemical compositions of brown carbon chromophores in different environments: Contributions and formation of functionalized aromatic compounds},
	journal = {Science of the Total EnvironmentScience of the Total Environment},
	volume = {786},
	year = {2021},
	note = {Export Date: 7 June 2021},
	type = {Article},
	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. {\textcopyright} 2021 Elsevier B.V.},
	keywords = {absorption, Absorption values, Aromatization, atmospheric pollution, Biomass, Biomass burning, biomass-burning, Bromine compounds, brown carbon, Brown carbons, Carbon, Chemical composition, Chemical compositions, China, Chromophores, color, complexity, Field studies, formation mechanism, Functionalized, Functionalized aromatic compound, Functionalized aromatic compounds, Light absorption, Nitrophenols, optical properties, Optical-, Phenols, Property, Vehicles, Volatile organic compounds},
	author = {X. Li and Hu, M. and Y. Wang and Xu, N. and Fan, H. and Zong, T. and Wu, Z. and Guo, S. and W. Zhu and S. Chen and Dong, H. and Zeng, L. and Yu, X. and Tang, X.}
}
