HR: 0800h
AN: A31C-0085    [Abstracts]
TI: An FTIR Study of Sulfur Dioxide (SO$_{2}) Uptake and Oxidation on Hydroxyl (OH) Radical Processed Sea-salt Components: Implications for Sulfur Accumulation in Sea-salt Aerosol
AU: * Robertson, W H
EM: robertsw@uci.edu
AF: University of California, Irvine, Department of Chemistry, 516 Rowland Hall, Irvine, CA 92697-2025 United States
AU: Shaka, H
EM: hshaka@uci.edu
AF: University of California, Irvine, Department of Chemistry, 516 Rowland Hall, Irvine, CA 92697-2025 United States
AU: Finlayson-Pitts, B J
EM: bjfinlay@uci.edu
AF: University of California, Irvine, Department of Chemistry, 516 Rowland Hall, Irvine, CA 92697-2025 United States
AB: Both the uptake of sulfur dioxide and the rate of its subsequent aqueous oxidation to sulfate by ozone (O$_{3}) are strongly enhanced at high pH. Recent studies have implied an increase in sea salt particle alkalinity, or a delay of acidification, when reacted with hydroxyl (OH) radicals. Diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) has been applied to examine how the interaction of sulfur dioxide (SO$_{2}) with sea salt aerosol analogs is affected by prior OH radical processing. The role of water films present on partially deliquesced sea salt particles is highlighted. Implications for atmospheric SO$_{2} concentrations and aerosol formation will be discussed.
DE: 4801 Aerosols (0305)
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting