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Chemical Transformation of Polycyclic Aromatic Hydrocarbons via Heterogeneous Reactions

Shiraiwa, Manabu (2013) Chemical Transformation of Polycyclic Aromatic Hydrocarbons via Heterogeneous Reactions. Earozoru Kenkyu, 28 (1). pp. 27-33. ISSN 0912-2834. doi:10.11203/jar.28.27.

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The heterogeneous reactions of atmospheric oxidants with aerosol particles are of central importance to air quality. Polycyclic aromatic hydrocarbons (PAHs) are efficiently oxygenated upon exposure to ozone, which leads to an enhancement in toxicity. For a wide range of substrates, including solid and liquid organic and inorganic substances, the concentration and time-dependence of the heterogeneous reaction between PAHs and O_3 can be well described by a Langmuir-Hinshelwood mechanism. Competitive adsorption and chemical transformation of the surface lead to a strong non-linear dependence of uptake coefficient of O_3 on time and gas phase composition, with different characteristics under dilute atmospheric and concentrated laboratory conditions. Long-lived reactive oxygen intermediates (ROIs) are formed upon decomposition of O_3 on PAH surface. The ROIs reconcile apparent discrepancies between earlier quantum mechanical calculations and kinetic experiments. They play a key role in the chemical transformation and adverse health effects of toxic and allergenic air particulate matter. Moreover, ROIs may contribute to the coupling of atmospheric and biospheric multiphase processes.

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Shiraiwa, Manabu0000-0003-2532-5373
Additional Information:© 2013 Japan Association of Aerosol Science and Technology. Received 8 October 2012. Accepted 29 October 2012. Released on J-STAGE 2013/04/06.
Subject Keywords:Polycyclic Aromatic Hydrocarbon, Ozonolysis, Reactive Oxygen Species, Langmuir-Hinshelwood Mechanism, Soot
Issue or Number:1
Record Number:CaltechAUTHORS:20130624-093404453
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Official Citation: Chemical Transformation of Polycyclic Aromatic Hydrocarbons via Heterogeneous Reactions Manabu SHIRAIWA Released: April 06, 2013 p.27-33
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39045
Deposited By: Ruth Sustaita
Deposited On:24 Jun 2013 17:19
Last Modified:09 Nov 2021 23:42

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