Abstract
Atmospheric aerosols are often found to be acidic. Predicting the composition of these multi-component aerosols as a function of relative humidity is important in estimating their water content, phase state and acidity. In this work, a computational method that was previously developed and applied to neutral acidity solutions to determine deliquescence relative humidities is extended to acidic solutions. Three sets of acid aerosol compositions are analyzed: H +NH 4 +HSO 4 −SO 4 2−NO 3 −, H +NH 4 +HSO 4 −SO 4 2−Cl − and H +NH 4NO 3 −Cl −. Solubility products are used to determine phase state and water activity at saturation. Activity coefficients are predicted using the recently developed mole-fraction-based thermodynamic model of Clegg and coworkers, along with Pitzer's-molality-based method. Partial dissociation of bisulfate ion, HSO 4 − = H + + SO 4 2−, is considered explicitly. For each set of components, water activities at deliquescence are plotted as a function of composition. Trajectories are included that show variation in the composition of the aqueous phase in a multiphase aerosol as a function of relative humidity.
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