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Fourier transform infrared analysis of aerosol formed in the photo-oxidation of isoprene and β-pinene

Palen, Edward J. and Allen, David T. and Pandis, Spyros N. and Paulson, Suzanne E. and Seinfeld, John H. and Flagan, Richard C. (1992) Fourier transform infrared analysis of aerosol formed in the photo-oxidation of isoprene and β-pinene. Atmospheric Environment Part A-General Topics, 26 (7). pp. 1239-1251. ISSN 0960-1686. doi:10.1016/0960-1686(92)90385-x.

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The chemical composition of smog-chamber aerosol generated during the photo-oxidation of isoprene and β-pinene was probed using infrared (i.r.) microscopy interfaced with a low pressure impactor. The low-pressure impactor employed ZnSe impaction surfaces which allowed direct analysis, with no extraction, using i.r. microscopy. The low detection limits of this technique, coupled with direct sample analysis, permitted the chemical analysis of aerosol generated at low to moderate hydrocarbon and ozone loadings. The quantitative analysis of the i.r. spectra is limited, in part, by the absence of calibration standards, however, it is clear that the biogenic aerosols generated in this work were liquid mixtures containing ketone, aldehyde, alcohol and organonitrate functional groups. Molar loadings of each of these functional groups were estimated for nine smog-chamber experiments. For aerosol formed in isoprene photo-oxidation, aldehyde and ketone groups dominated (1.8 groups per average molecule) while for aerosol formed in β-pinene photo-oxidation, alcohols and ketones dominated (a combined 2.7 groups per average molecule).

Item Type:Article
Related URLs:
URLURL TypeDescription
Pandis, Spyros N.0000-0001-8085-9795
Paulson, Suzanne E.0000-0003-0855-7615
Seinfeld, John H.0000-0003-1344-4068
Flagan, Richard C.0000-0001-5690-770X
Additional Information:This work was supported by National Science Foundation grant ATM-9003186 and by the Environmental Protection Agency under assistance agreement CR-812771 to the National Center for Intermedia Transport Research. Although the information in this document has been funded in part by the United States Environmental Protection Agency under assistant agreement CR-812771 to the National Center for Intermedia Transport Research, it does not necessarily reflect the views of the Agency and no official endorsement should be inferred.
Funding AgencyGrant Number
Environmental Protection Agency (EPA)CR-812771
Issue or Number:7
Record Number:CaltechAUTHORS:20230301-108334100.1
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:119600
Deposited By: Tony Diaz
Deposited On:02 Mar 2023 18:50
Last Modified:02 Mar 2023 18:50

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