Enhanced secondary organic aerosol formation from the photo-oxidation of mixed anthropogenic volatile organic compounds
<p>Vehicular exhaust is one of the important contribution sources of secondary organic aerosol (SOA) in urban areas. Long-chain alkanes and aromatic hydrocarbons are included in gaseous organic pollutants of vehicle emissions, representative of diesel and gasoline vehicles respectively. In thi...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2021-05-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/21/7773/2021/acp-21-7773-2021.pdf |
| Summary: | <p>Vehicular exhaust is one of the important contribution sources of
secondary organic aerosol (SOA) in urban areas. Long-chain alkanes and
aromatic hydrocarbons are included in gaseous organic pollutants of vehicle
emissions, representative of diesel and gasoline vehicles respectively.
In this work, the SOA production from individual anthropogenic volatile
organic compounds (AVOCs) (<span class="inline-formula"><i>n</i></span>-dodecane, 1,3,5-trimethylbenzene) and mixed
AVOCs (<span class="inline-formula"><i>n</i></span>-dodecane <span class="inline-formula">+</span> 1,3,5-trimethylbenzene) was studied with a
large-scale outdoor smog chamber. Results showed that the SOA formation from
the mixed AVOCs was enhanced compared to the predicted SOA mass
concentration based on the SOA yield of individual AVOCs. According to the
results of mass spectrometry analysis with electrospray ionization
time-of-flight mass spectrometry (ESI-ToF-MS), interaction occurred between
intermediate products from the two precursors, which could be the main
reason for the enhanced SOA production from the mixed AVOC reaction system.
The study results could improve our understanding about the contribution of
representative precursors from vehicular exhaust to the formation of SOA
in urban areas. This study also indicates that further studies on SOA
chemistry from the mixed VOC reaction system are needed, as the
interactions between them and the effect on SOA formation can give us a
further understanding of the SOA formed in the atmosphere.</p> |
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| ISSN: | 1680-7316 1680-7324 |