Reaction of HOCl with Wood Smoke Aerosol: Impacts on Indoor Air Quality and Outdoor Reactive ChlorineClick to copy article linkArticle link copied!
- Spiro D. Jorga*Spiro D. Jorga*Email: [email protected]Department of Chemistry, University of Toronto, Toronto, M5S 3H6Ontario, CanadaMore by Spiro D. Jorga
- Yutong WangYutong WangDepartment of Chemistry, University of Toronto, Toronto, M5S 3H6Ontario, CanadaMore by Yutong Wang
- Jonathan P. D. Abbatt*Jonathan P. D. Abbatt*Email: [email protected]Department of Chemistry, University of Toronto, Toronto, M5S 3H6Ontario, CanadaMore by Jonathan P. D. Abbatt
Abstract
High loadings of biomass burning (BB) aerosol particles from wildfire or residential heating sources can be present in both outdoor and indoor environments, where they deposit onto surfaces such as walls and furniture. These pollutants can interact with oxidants in both the aerosol and deposited forms. Hypochlorous acid (HOCl), a strong oxidant emitted during cleaning with chlorine-cleaning agents such as bleach, can attain mixing ratios of hundreds of ppbv indoors; moreover, lower mixing ratios are naturally present outdoors. Here, we report the heterogeneous reactivity of HOCl with wood smoke aerosol particles. After exposure to gas-phase HOCl, the particle chlorine content increased reaching chlorine-to-organic mass ratios of 0.07 with the chlorine covalently bound as organochlorine species, many of which are aromatic. Investigating individual potential BB components, we observed that unsaturated species such as coniferaldehyde and furfural react efficiently with HOCl. These observations indicate that organochlorine pollutants will form indoors when bleach cleaning a wildfire impacted space. The chlorine component of particles internally mixed with BB material and chloride initially increased, upon HOCl exposure, indicating that active chlorine recycling in the outdoor environment will be suppressed in the presence of BB emissions.
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