气候变化领域集成服务门户(CCPortal): Comprehensive characterizations of HULIS in fresh and secondary emissions of crop straw burning

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DOI	10.1016/j.atmosenv.2021.118220
	Comprehensive characterizations of HULIS in fresh and secondary emissions of crop straw burning
	Huo Y.; Wang Y.; Qi W.; Jiang M.; Li M.
发表日期	2021
ISSN	1352-2310
卷号	248
英文摘要	The humic-like substances (HULIS) in PM2.5 in fresh and secondary emissions of crop straw burning will result in strong light absorption of atmospheric aerosols in the near-ultraviolet and visible light region. Herein, the relative carbon contents, light absorption properties, fluorescence characteristics, FTIR and 1H NMR spectra of fresh and secondary HULIS in crop straws (wheat, rice, and corn) burning were comprehensively characterized. The results showed that the ratios of carbon contents in HULIS to water-soluble organic carbon and organic carbon (HULIS-C/WSOC and HULIS/OC) of HULIS in secondary emissions of crop straw burning were higher than that in fresh emissions. The MAE365 (mass absorption efficiencies at 365 nm) of secondary HULIS in crop straws burning were larger than that in fresh emissions. Excitation-emission matrix (EEM) spectra indicated that fresh HULIS contained phenol-like substances, which can form light-absorbing substances through secondary conversion. The spectrum of FTIR and 1H-nuclear magnetic resonance (1H NMR) showed that chemical structures of secondary HULIS in crop straws combustion were more complicated and contained more absorbing aromatic groups (e.g. aromatic rings, carbonyl groups, and aliphatic chains). Therefore, the secondary aerosol conversion may cause more aromatic structures in HULIS from crop straws burning, resulting in stronger light absorption abilities. © 2021 Elsevier Ltd
语种	英语
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/168995
作者单位	College of Environmental Science and Engineering, Beijing Forestry University, Beijing, China; Department of Environmental Science and Engineering, Fudan University, Shanghai, China
推荐引用方式 GB/T 7714	Huo Y.,Wang Y.,Qi W.,et al. Comprehensive characterizations of HULIS in fresh and secondary emissions of crop straw burning[J],2021,248.
APA	Huo Y.,Wang Y.,Qi W.,Jiang M.,&Li M..(2021).Comprehensive characterizations of HULIS in fresh and secondary emissions of crop straw burning.Atmospheric Environment,248.
MLA	Huo Y.,et al."Comprehensive characterizations of HULIS in fresh and secondary emissions of crop straw burning".Atmospheric Environment 248(2021).