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Aerosol Inorganics and Organics Model (Aiom) With User Defined Properties for Organic Compounds

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Abstract:The Aerosol Inorganics Model (AIM) is widely used to calculate gas/liquid/solid phase equilibrium in aerosol systems containing the species H+-NH4+-SO42--NO3--H2O over a range of tropospheric temperatures. In this internal report the model is extended to include organic compounds in order to treat the behavior and interactions of the organic component of PM2.5. This report describes the extension of the AIM model, using the method of Clegg to include an arbitrary number of aerosol organic compounds. These compounds have thermodynamic properties defined by the user and can partition between gas, aqueous, solid, mixed solid, and separate organic-water phases. The organic compounds can also dissociate (to produce H+ ion) in the liquid phase(s). In this report the underlying theory of the extended model is described, followed by its capabilities and features, and then instructions on how it is used. Also included are diskettes containing the executable code for the completed model, and a secondary executable code for fitting activity data for organic-water solutions.

The United States Environmental Protection Agency through its Office of Research and Development partially funded and collaborated in the research described here under contracts 68D-00206 to ManTech Environmental Technology, Inc. and 3D-5095-NAEX to the University of East Anglia. It has been subjected to Agency review and approved for dissemination.
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Citation:Clegg, S. L., and E. O. Edney. Aerosol Inorganics and Organics Model (Aiom) With User Defined Properties for Organic Compounds. U.S. Environmental Protection Agency, Washington, DC, EPA/600/C-04/105, 2004.
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Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
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Division: Human Exposure & Atmospheric Sciences Division
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Branch: Process Modeling Research Branch
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Product Type: Software
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Published: 09/01/2004
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Downloads:
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Bullet Item Aerosol Inorganics and Organics Model (Aiom) With User Defined Properties for Organic Compounds
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Related Entries:
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Bullet Item Science Version of PM Chemistry Model
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