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Criegee intermediates in the indoor environment: new insights
D E Shallcross1, C A Taatjes, C J Percival
1School of Chemistry, Cantock's Close, University of Bristol, Bristol, UK.
Criegee intermediates impact indoor air chemistry. Their rapid reactions with NO2 and SO2 accelerate NO3 formation and SO2 removal, while reactions with halogenated carbonyls offer new indoor loss pathways.
Area of Science:
- Atmospheric Chemistry
- Environmental Science
Background:
- Criegee intermediates form during alkene ozonolysis.
- They are significant sources of hydroxyl (OH) radicals indoors.
- Recent data reveal rapid reactions with NO2, SO2, and carbonyls.
Purpose of the Study:
- To investigate the impact of Criegee intermediate reactions on indoor chemistry.
- To assess the influence of new kinetic data on indoor air quality models.
Main Methods:
- Utilized steady-state calculations.
- Incorporated recent experimental reaction rate data.
Main Results:
- Reactions significantly accelerate indoor nitrate radical (NO3) formation.
- These reactions enhance indoor sulfur dioxide (SO2) removal rates.
- Interactions with halogenated carbonyls introduce a new indoor loss mechanism.
Conclusions:
- Criegee intermediates play a more dynamic role in indoor chemistry than previously understood.
- The findings suggest potential for improved indoor air quality modeling.
- New reaction pathways involving Criegee intermediates have been identified for indoor environments.
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