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The Heterogeneous Reaction of Hydroxyl Radicals with Sub-micron Squalane Particles: a Model System for Understanding the Oxidative Aging of Ambient Aerosols : Volume 9, Issue 9 (18/05/2009)

By Smith, J. D.

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Book Id: WPLBN0003993371
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: The Heterogeneous Reaction of Hydroxyl Radicals with Sub-micron Squalane Particles: a Model System for Understanding the Oxidative Aging of Ambient Aerosols : Volume 9, Issue 9 (18/05/2009)  
Author: Smith, J. D.
Volume: Vol. 9, Issue 9
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Ahmed, M., Cappa, C. D., Kroll, J. H., Che, D. L., Liu, C. L., Wilson, K. R.,...Worsnop, D. R. (2009). The Heterogeneous Reaction of Hydroxyl Radicals with Sub-micron Squalane Particles: a Model System for Understanding the Oxidative Aging of Ambient Aerosols : Volume 9, Issue 9 (18/05/2009). Retrieved from http://www.ebooklibrary.org/


Description
Description: Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. The heterogeneous reaction of OH radicals with sub-micron squalane particles, in the presence of O2, is used as a model system to explore the fundamental chemical mechanisms that control the oxidative aging of organic aerosols in the atmosphere. Detailed kinetic measurements combined with elemental mass spectrometric analysis reveal that the reaction proceeds sequentially by adding an average of one oxygenated functional group per reactive loss of squalane. The reactive uptake coefficient of OH with squalane particles is determined to be 0.3±0.07 at an average OH concentration of ~1×1010 molecules cm−3. Based on a comparison between the measured particle mass and model predictions it appears that significant volatilization of a reduced organic particle would be extremely slow in the real atmosphere. However, as the aerosols become more oxygenated, volatilization becomes a significant loss channel for organic material in the particle-phase. Together these results provide a chemical framework in which to understand how heterogeneous chemistry transforms the physiochemical properties of particle-phase organic matter in the troposphere.

Summary
The heterogeneous reaction of hydroxyl radicals with sub-micron squalane particles: a model system for understanding the oxidative aging of ambient aerosols

Excerpt
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