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Thermodynamics of the water-soluble crustal ionic tween the gas and aerosol phases. Thermodynamic species c a Z + , K +, and M~~~ are added to that of properties for the aerosol species that include the above those species already included (Na +, NH: , C I , NO;, ions, equilibrium constants, ionic activity coefficients, and SO:-) in the gas-particle equilibrium model water activity, and deliquescence points, are estimated. SCAPE (Kim et al., 1993ab) which estimates the stateVarious methods for activity coefficient estimation are and composition of atmospheric inorganic species hecompared.

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The gas-aerosol equilibrium model, SCAPE, presented in Part I is used to evaluate the sensitivity of thermodynamic calculations of aerosol composition to common approximations and the choice of activity coefficient estimation method. The treatment of weak electrolytes, associated ammonia, NH,(aq), and bisulfate ion, HSO,, is analyzed. Comparisons of the three multicomponent activity coefficient estimation methods are carried out with a variety of data. On the basis of the sensitivity analysis results, recommendations are provided for treating these electrolytes and for selecting an activity coefficient estimation method in atmospheric gas-aerosol equilibrium calculations. The two gasaerosol equilibrium models, SCAPE and AIM, are compared. Remaining questions in gas-aerosol equilibrium are highlighted.

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