NDLI: High-resolution mass spectrometric analysis of secondary organic aerosol produced by ozonation of limonene.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Walser, Maggie L. Desyaterik, Yury Laskin, Julia Laskin, Alexander Nizkorodov, Sergey A.
Description	Country affiliation: United States Author Affiliation: Walser ML ( Department of Chemistry, University of California Irvine, Irvine, California 92617-2025, USA.)
Abstract	Chemical composition of secondary organic aerosol (SOA) formed from the ozone-initiated oxidation of limonene is characterized by high-resolution electrospray ionization mass spectrometry in both positive and negative ion modes. The mass spectra reveal a large number of both monomeric (m/z < 300) and oligomeric (m/z > 300) condensed products of oxidation. A combination of high resolving power (m/Deltam approximately 60,000) and Kendrick mass defect analysis makes it possible to unambiguously determine the molecular composition of hundreds of individual compounds in SOA samples. Van Krevelen analysis shows that the SOA compounds are heavily oxidized, with average O : C ratios of 0.43 and 0.50 determined from the positive and negative ion mode spectra, respectively. A possible reaction mechanism for the formation of the first generation SOA molecular components is considered. The discussed mechanism includes known isomerization and addition reactions of the carbonyl oxide intermediates generated during the ozonation of limonene. In addition, it includes isomerization and decomposition pathways for alkoxy radicals resulting from unimolecular decomposition of carbonyl oxides that have been disregarded by previous studies. The isomerization reactions yield numerous products with a progressively increasing number of alcohol and carbonyl groups, whereas C-C bond scission reactions in alkoxy radicals shorten the carbon chain. Together these reactions yield a large number of isomeric products with broadly distributed masses. A qualitative agreement is found between the number and degree of oxidation of the predicted and measured reaction products in the monomer product range.
File Format	HTM / HTML
ISSN	14639076
Issue Number	7
Volume Number	10
e-ISSN	14639084
Journal	Physical Chemistry Chemical Physics
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2008-02-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Physics Discipline Biophysics Discipline Chemistry Aerosols Analysis Cyclohexenes Chemistry Ozone Spectrometry, Mass, Electrospray Ionization Instrumentation Methods Terpenes Molecular Structure Oxidation-reduction Reproducibility Of Results Journal Article Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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