Document Detail

Laboratory measurements of the heterogeneous oxidation of condensed-phase organic molecular makers for meat cooking emissions.
MedLine Citation:
PMID:  18754366     Owner:  NLM     Status:  MEDLINE    
Multiphase oxidation of trace organic constituents inside of complex atmospheric particles is not well understood. In this study, organic aerosol formed from flash-vaporized residual grease from meat cooking was exposed to atmospherically relevant ozone concentrations in a smog chamber for 4-6 h. Changes in particle composition were measured to determine reaction rates for important molecular markers used for source apportionment analysis (oleic acid, palmitoleic acid, and cholesterol). Results are also presented for palmitic and stearic acids and likely reaction products. To quantify oxidation rates over a range of atmospheric conditions, separate experiments were conducted at low and high relative humidity and using particles mixed with and without secondary organic aerosol. Although particle composition, relative humidity, and secondary organic aerosol all influence the reaction rates, the unsaturated compounds were rapidly oxidized in every experiment. At typical summertime conditions, palmitoleic acid, oleic acid and cholesterol are estimated to have a chemical lifetime of about one day. The experimentally determined reaction rates are used in conjunction with the chemical mass balance model to investigate the effects of aging on source apportionment estimates. The results highlight that assumptions regarding the photochemical stability of molecular markers can lead to substantial biases in predictions of receptor models.
Emily A Weitkamp; Kara E Huff Hartz; Amy M Sage; Neil M Donahue; Allen L Robinson
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Environmental science & technology     Volume:  42     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-08-29     Completed Date:  2008-12-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5177-82     Citation Subset:  IM    
Center for Atmospheric Particle Studies, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, USA.
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MeSH Terms
Aerosols / analysis*
Air Pollutants / analysis
Cholesterol / chemistry
Fatty Acids, Monounsaturated / chemistry
Oleic Acid / chemistry
Organic Chemicals / analysis*
Ozone / chemistry
Reg. No./Substance:
0/Aerosols; 0/Air Pollutants; 0/Fatty Acids, Monounsaturated; 0/Organic Chemicals; 10028-15-6/Ozone; 112-80-1/Oleic Acid; 2091-29-4/palmitoleic acid; 57-88-5/Cholesterol

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