Jump to main content
Jump to site search

Issue 36, 2009
Previous Article Next Article

Reactivity of oleic acid in organic particles: changes in oxidant uptake and reaction stoichiometry with particle oxidation

Author affiliations

Abstract

The heterogeneous reaction of ozone with oleic acid has been studied extensively as a simple model system for investigating the oxidation of organic compounds in atmospheric particles. In this work, we simultaneously quantify oleic acid and ozone decay during three stepwise oxidation events, allowing us to quantify reactivity of oleic acid throughout the oxidative lifetime of initially pure particles. Throughout their lifetime, uptake in these particles is driven by reaction, as evidenced by similar timescales for ozone and oleic acid decay. The oleic acid decay rate slows with increasing particle oxidation, most likely due to the continued dilution of the particles with oxidation products. However, the initial stoichiometry is as high as 3.75 oleic acid molecules destroyed per ozone molecule lost. This significantly exceeds the 2 : 1 ratio that can be explained by an initial ozonolysis reaction and known secondary chemistry between the Criegee intermediate and the organic acid moiety. It implies that there is additional, previously unrecognized secondary chemistry that likely involves the carbon backbone. Our understanding of reactivity, even in this simple system, remains incomplete.

Graphical abstract: Reactivity of oleic acid in organic particles: changes in oxidant uptake and reaction stoichiometry with particle oxidation

Back to tab navigation

Article information


Submitted
02 Mar 2009
Accepted
28 May 2009
First published
07 Jul 2009

Phys. Chem. Chem. Phys., 2009,11, 7951-7962
Article type
Paper

Reactivity of oleic acid in organic particles: changes in oxidant uptake and reaction stoichiometry with particle oxidation

A. M. Sage, E. A. Weitkamp, A. L. Robinson and N. M. Donahue, Phys. Chem. Chem. Phys., 2009, 11, 7951
DOI: 10.1039/B904285G

Social activity

Search articles by author

Spotlight

Advertisements