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Aerosol formation and growth in atmospheric organic/NO_x systems—I. Outdoor smog chamber studies of C_7- and C_8-hydrocarbons

Wang, Shih Chen and Paulson, Suzanne E. and Grosjean, Daniel and Flagan, Richard C. and Seinfeld, John H. (1992) Aerosol formation and growth in atmospheric organic/NO_x systems—I. Outdoor smog chamber studies of C_7- and C_8-hydrocarbons. Atmospheric Environment Part A-General Topics, 26A (3). pp. 403-420. ISSN 0960-1686. doi:10.1016/0960-1686(92)90326-G.

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Outdoor smog chamber experiments have been performed to determine the aerosol-forming potential of selected C_7- and C_8-hydrocarbons in sunlight-irradiated hydrocarbon-NO_x mixtures. Measured aerosol size distributions were used to determine the rates of gas-to-particle conversion and to study the effects of the addition of SO_2 and/or NH_3 on aerosol formation and growth. The average aerosol yields by mass for the hydrocarbons studied were (the range of measured values for methylcyclohexane and 1-octene are in parentheses): • methylcyclohexane 9.2% (0.12–18.8); • 1-octene 4.2% (0.17–6.9); • toluene 18.6%; • n-octane <0.001%. The average yields are accompanied by large standard deviations (see Table 3) and depended strongly on the conditions, particularly the hydrocarbon to NO_x initial concentration ratio. Addition of SO_2 to the organic/NO_x systems led to an early nucleation burst and subsequent rapid growth of the newly formed aerosol. In the presence of NH_3, the gas-to-particle conversion rate of the organic/NO_x system was enhanced perhaps due to the formation of NH_4NO_3 or the reaction of NH_3 with carboxylic acids. Sustained particle formation was observed when both SO_2 and NH_3 were present, presumably as a result of (NH_4)_2SO_4 formation. We have estimated the complexity of the 1-octene aerosol and identified 5-propyl furanone as a component of the aerosol.

Item Type:Article
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URLURL TypeDescription
Paulson, Suzanne E.0000-0003-0855-7615
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Additional Information:© 1991 Elsevier. (First received 6 December 1990 and in final form 9 May 1991). This work was supported by the Coordinating Research Council, project AP-6. Assistance in conducting the smog chamber experiments by Fangdong Yin is appreciated. The authors also wish to acknowledge Rudi Karch and Wolfgang Winklmayr from the University of Vienna for their contributions to the aerosol measurements. The authors also wish to thank Christoph Schaffner and Walter Giger of Swiss Federal Institute of Water Resources and Water Pollution Control (EAWAG) in Diibendorf, Switzerland, for carrying out the GC-MS analysis of the aerosol samples.
Funding AgencyGrant Number
Coordinating Research CouncilAP-6
Subject Keywords:organic aerosols; photochemical smog
Issue or Number:3
Record Number:CaltechAUTHORS:20160303-162819560
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ID Code:65070
Deposited By: Katherine Johnson
Deposited On:04 Mar 2016 00:34
Last Modified:10 Nov 2021 23:39

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