March 2008

Document Type


Degree Name



Dept. of Environmental and Biomolecular Systems


Oregon Health & Science University


In the first part of the dissertation, a thermodynamic model is presented for predicting the formation of particulate matter (PM) within an aerosol that contains organic compounds, inorganic salts, and water. Neutral components are allowed to partition from the gas phase to the PM, with the latter potentially composed of both a primarily aqueous (?) liquid phase and a primarily organic (?) liquid phase. In the second part of the dissertation, the commonly used existing two-product model (Odum et al., 1996) is advanced to account for the relative humidity effects on levels of organic particulate matter (OPM) mass. The two-product model predicts secondary organic aerosol (SOA) formation in the atmosphere using a multiple lumped "two-product" (No2p) approach. The third part of the dissertation focuses on the practical applicability of the activity coefficient model to computationally demanding, large-scale air quality models. The study used two very simple basis sets of compound characteristic parameters, vapor pressure (p ° L,i ) and octanol-water partition coefficient (Kow,i), to predict compound distribution in gas and particle phases.




OGI School of Science and Engineering



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