Studies Of The Uptake Of Gaseous Ethyl-3-ethoxy
Propionate Onto Ammonium Sulfate And
Ammonium Nitrate Aerosol Particles
Author(s)
K. D. Stewart & J. M. Andino
Abstract
Understanding the heterogeneous (gas-particle) interactions that occur in the
troposphere is of seminal importance for modellers that assess the atmospheric
fates and transport of gases. One means of understanding these interactions is to
calculate the mass uptake coefficient of a gaseous species onto common
anthropogenic aerosols via an experimental means. The effective uptake
behavior of gaseous Ethyl –3-Ethoxy Propionate (E3EP) onto ammonium sulfate
and ammonium nitrate aerosols of varying total surface areas was studied using a
custom manufactured flow system. E3EP is an organic species that is commonly
found in paint and paint products. Ammonium sulfate and ammonium nitrate
aerosols were studied because of their abundance in the troposphere. Gas phase
E3EP concentrations were obtained using a solid phase microextraction
technique (SPME) coupled to a gas chromatograph with a flame ionization
detector (GC-FID). Analyses of the ammonium sulfate and ammonium nitrate
aerosols were carried out using a Scanning Mobility Particle Sizing system
(SMPS). As expected, losses of gaseous E3EP onto the aerosol surfaces
decreased with decreasing initial surface area. The calculated initial effective
uptake coefficients were shown to vary, depending on aerosol composition. Due
to the lack of published literature data regarding the heterogeneous interactions
of organic species in the troposphere, these studies provide a significant
enhancement to the overall knowledge base.
Keywords: aerosol, uptake, ethyl-3-ethoxypropionate, heterogeneous
atmospheric chemistry.
Keywords
aerosol, uptake, ethyl-3-ethoxypropionate, heterogeneous
atmospheric chemistry.
Related Book
Other papers in this volume
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