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AGU: Geophysical Research Letters

 

Index Terms

  • Atmospheric Composition and Structure: Troposphere—composition and chemistry
  • Atmospheric Composition and Structure: Chemical kinetic and photochemical properties
  • Atmospheric Composition and Structure: Pollution—urban and regional
  • Atmospheric Composition and Structure: Aerosols and particles
  • Atmospheric Composition and Structure: Instruments and techniques

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 29, 1357, 4 PP., 2002
doi:10.1029/2002GL014692

Kinetics of submicron oleic acid aerosols with ozone: A novel aerosol mass spectrometric technique

J. W. Morris

Chemistry Department, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, USA

P. Davidovits

Chemistry Department, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, USA

J. T. Jayne

Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc., Billerica, MA, USA

J. L. Jimenez

Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc., Billerica, MA, USA

Q. Shi

Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc., Billerica, MA, USA

C. E. Kolb

Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc., Billerica, MA, USA

D. R. Worsnop

Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc., Billerica, MA, USA

W. S. Barney

Department of Environmental Engineering, California Institute of Technology, Pasadena, CA, USA

G. Cass

Department of Environmental Engineering, California Institute of Technology, Pasadena, CA, USA

The reaction kinetics of submicron oleic (9-octadecanoic (Z)-) acid aerosols with ozone was studied using a novel aerosol mass spectrometric technique. In the apparatus a flow of size-selected aerosols is introduced into a flow reactor where the particles are exposed to a known density of ozone for a controlled period of time. The aerosol flow is then directed into an aerosol mass spectrometer for particle size and composition analyses. Data from these studies were used to: (a) quantitatively model the size-dependent kinetics process, (b) determine the aerosol size change due to uptake of ozone, (c) assess reaction stoichiometry, and (d) obtain qualitative information about the volatility of the reaction products. The reactive uptake probability for ozone on oleic acid particles obtained from modeling is 1.6 (±0.2) × 10−3 with an upper limit for the reacto-diffusive length of ∼10 nm. Atmospheric implications of the results are discussed.

Published 15 May 2002.

Citation: Morris, J. W., P. Davidovits, J. T. Jayne, J. L. Jimenez, Q. Shi, C. E. Kolb, D. R. Worsnop, W. S. Barney, and G. Cass (2002), Kinetics of submicron oleic acid aerosols with ozone: A novel aerosol mass spectrometric technique, Geophys. Res. Lett., 29(9), 1357, doi:10.1029/2002GL014692.

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