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Heterogeneous reaction of ozone with syringic acid: Uptake of O 3 and changes in the composition and optical property of syringic acid

Syringic acid, which is a typical methoxyphenol emitted from wood combustion, can provide heterogeneous reaction sites for gaseous active components, influencing the concentrations of trace gases and the compositions of syringic acid. The heterogeneous uptake of O on syringic acid was investigated u...

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Bibliographic Details
Published in:Environmental pollution (1987) 2020-02, Vol.257, p.113632
Main Authors: Zhang, Tingting, Yang, Wangjin, Han, Chong, Yang, He, Xue, Xiangxin
Format: Article
Language:English
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Summary:Syringic acid, which is a typical methoxyphenol emitted from wood combustion, can provide heterogeneous reaction sites for gaseous active components, influencing the concentrations of trace gases and the compositions of syringic acid. The heterogeneous uptake of O on syringic acid was investigated using a flow tube reactor under ambient pressure. The initial uptake coefficient (γ ) and the steady-state uptake coefficient (γ ) of O linearly increased with syringic acid mass (0-0.16 μg cm ) and temperature (278-328 K), while they decreased with increasing the O concentration and the O content. The γ was independent of relative humidity (20%-70%), whereas γ decreased with relative humidity (7%-70%). The compositional changes of syringic acid by the ozonization were analyzed by the Fourier transform infrared spectrometer (FT-IR) and the gas chromatography-mass spectrometry (GC-MS), confirming the generation of 2,6-dimethoxy-1,4-benzoquinone. In addition, compared to that of fresh syringic acid, the mass absorption efficiency of syringic acid aged by O exhibited an increase in the range of 290-320 nm.
ISSN:1873-6424
DOI:10.1016/j.envpol.2019.113632