Particle Phase Acidity and Oligomer Formation in Secondary Organic Aerosol

A series of controlled laboratory experiments are carried out in dual Teflon chambers to examine the presence of oligomers in secondary organic aerosols (SOA) from hydrocarbon ozonolysis as well as to explore the effect of particle phase acidity on SOA formation. In all seven hydrocarbon systems stu...

Full description

Saved in:

Bibliographic Details
Published in:	Environmental science & technology Vol. 38; no. 24; pp. 6582 - 6589
Main Authors:	Gao, Song, Ng, Nga L, Keywood, Melita, Varutbangkul, Varuntida, Bahreini, Roya, Nenes, Athanasios, He, Jiwen, Yoo, Kee Y, Beauchamp, J. L, Hodyss, Robert P, Flagan, Richard C, Seinfeld, John H
Format:	Journal Article
Language:	English
Published:	Washington, DC American Chemical Society 15-12-2004
Subjects:	Acids Aerosols Aerosols - chemistry Air Pollutants - analysis Applied sciences Atmospheric pollution Effects Exact sciences and technology Experiments Hydrocarbons Hydrocarbons - analysis Hydrocarbons - chemistry Hydrogen-Ion Concentration Oxidants, Photochemical - chemistry Ozone - chemistry Particle Size Pollutants physicochemistry study: properties, effects, reactions, transport and distribution Pollution Ozonolysis Laboratory study Catalytic reaction Hydrocarbon Pollutant formation Troposphere Environmental factor Secondary pollutant Acidity Volatile organic compound Oligomer Ion trap Controlled environment study Atmospheric chemistry Mass spectrometry MS/MS Aerosols Air pollution Organic compounds Heterogeneous reaction
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	A series of controlled laboratory experiments are carried out in dual Teflon chambers to examine the presence of oligomers in secondary organic aerosols (SOA) from hydrocarbon ozonolysis as well as to explore the effect of particle phase acidity on SOA formation. In all seven hydrocarbon systems studied (i.e., α-pinene, cyclohexene, 1-methyl cyclopentene, cycloheptene, 1-methyl cyclohexene, cyclooctene, and terpinolene), oligomers with MW from 250 to 1600 are present in the SOA formed, both in the absence and presence of seed particles and regardless of the seed particle acidity. These oligomers are comparable to, and in some cases, exceed the low molecular weight species (MW < 250) in ion intensities in the ion trap mass spectra, suggesting they may comprise a substantial fraction of the total aerosol mass. It is possible that oligomers are widely present in atmospheric organic aerosols, formed through acid- or base-catalyzed heterogeneous reactions. In addition, as the seed particle acidity increases, larger oligomers are formed more abundantly in the SOA; consequently, the overall SOA yield also increases. This explicit effect of particle phase acidity on the composition and yield of SOA may have important climatic consequences and need to be considered in relevant models.
Bibliography:	ark:/67375/TPS-JZKQN3CW-H istex:0407E3728D9547169098764373B3A36B0819FEF5
ISSN:	0013-936X 1520-5851
DOI:	10.1021/es049125k