Light Absorption and Fluorescence Characteristics of Atmospheric Water-soluble Organic Compounds and Humic-like Substances During the Winter Season in Guangzhou

被引：6
|
作者：
Fan X.-J. [1 ]
Yu X.-F. [1 ]
Cao T. [1 ,2 ]
Wang Y. [1 ]
Xiao X. [1 ]
Xie Y. [1 ]
Li F.-Y. [1 ]
Song J.-Z. [2 ]
Peng P.-A. [2 ]
机构：
[1] College of Resource and Environment, Anhui Science and Technology University, Fengyang
[2] State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou
来源：
Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 02期
关键词：
EEM-PARAFAC; Fluorescence characteristics; Humic-like substances(HULIS); Light absorption; Water soluble organic compounds(WSOC);
D O I：
10.13227/j.hjkx.201807164
中图分类号：
学科分类号：
摘要：
The light absorption and fluorescence characteristics of atmospheric water-soluble organic compounds (WSOC) and humic-like substances (HULIS) during the winter season in Guangzhou were examined using UV-vis spectroscopy and excitation-emission matrix spectroscopy combined with parallel factor analysis (EEM-PARAFAC). The results showed that the SUVA 254 , HIX, and MAE 365 values of HULIS were higher than those of WSOC, suggesting that the former had higher aromaticity, humification, and light-absorption capacity in winter atmospheric PM 2.5 in Guangzhou. EEM-PARAFAC analysis identified three fluorescence components, including fulvic-like acid (C1), humic-like acid (C2), and protein-like (C3) components. The total humic-like components (C1+C2) accounted for 78% and 85% for WSOC and HULIS, respectively, which indicated that humic-like fluorescence components were the major components for both WSOC and HULIS and that HULIS were enriched with the dominant humic-like fluorophores. In addition, the aromaticity, humification, light-absorbing capacity, and C2 levels of WSOC and HULIS during the haze episode were significantly higher than those in the non-haze episode. This suggested that the water-soluble organics with higher molecular weights and stronger light-absorption capacities tended to form during the haze episode. The correlations analysis revealed strong negative correlations between C1 levels of WSOC and HULIS and HIX, MAE 365 , OC sec , K + , SO 4 2- , and NH 4 + . Additionally, strong positive correlations were observed between C2 levels and the same factors. These results implied that the decrease in C1 and increase in C2 might lead to increased humification and light-absorption in WSOC and HULIS, and biomass burning and secondary organic aerosols might contribute to the C2 component. © 2019, Science Press. All right reserved.
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页码：532 / 539
页数：7
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