Experimental study on synchrotron radiation photoionization of secondary organic aerosol derived from styrene ozonolysis

Secondary organic aerosol (SOA) produced by ozonolysis of styrene and other alkene compounds is a major part of fine particles in urban atmospheres. The atmospheric ozonolysis process of styrene is simulated in a smog chamber, and the formed SOA particles are detected on‐line by a synchronous radiat...

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Bibliographic Details
Published in:Journal of the Chinese Chemical Society (Taipei) 2023-04, Vol.70 (4), p.938-948
Main Authors: Huang, Ming‐Qiang, Wang, Huan‐Huan, Shan, Xiao‐Bin, Sheng, Liu‐Si, Hu, Chang‐Jin, Gu, Xue‐Jun, Zhang, Wei‐Jun
Format: Article
Language:English
Subjects:
Absorption spectra
Aerosols
Benzaldehyde
Benzene
Benzoic acid
Constituents
Formic acid
Infrared absorption
Infrared spectra
Ions
Mass spectra
Molecular ions
Oxidation
Photoionization
Radiation
reaction mechanism
secondary organic aerosol
Smog
styrene
Styrenes
Synchrotron radiation
Synchrotrons
Ultraviolet radiation
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Summary:Secondary organic aerosol (SOA) produced by ozonolysis of styrene and other alkene compounds is a major part of fine particles in urban atmospheres. The atmospheric ozonolysis process of styrene is simulated in a smog chamber, and the formed SOA particles are detected on‐line by a synchronous radiation vacuum ultraviolet photoionization mass spectrometer (VUV‐PIMS) in this study. Through molecular ion peaks in the photonionization mass spectra of SOA and the corresponding photoionization efficiency curve, combined with off‐line measurement verification of ultraviolet visible and infrared absorption spectra, it is determined that formaldehyde, formic acid, benzene, phenol, benzaldehyde, and benzoic acid are the main constituents of styrene SOA. These provide new information for studying the atmospheric ozonolysis oxidation mechanism of styrene. VUV‐PIMS can get over complicated sample preparation procedures, secondary pollution, and other shortcomings of the off‐line method and is a useful instrument to measure constituents and unveil the formation process of SOA particles. Secondary organic aerosol (SOA) particles from ozonolysis of styrene are on‐line measured using a synchrotron radiation vacuum ultraviolet photoionization mass spectrometer (VUV‐PIMS). Formaldehyde, formic acid, benzene, phenol, benzaldehyde, and benzoic acid are identified as principal constituents of styrene SOA. VUV‐PIMS with the “soft ionization” is a helpful tool to measure the chemical constituents and reveal the formation processes of SOA particles.
ISSN:0009-4536
2192-6549
DOI:10.1002/jccs.202200557