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We suggest a chemical model for the composition and atmospheric processing of mixed organic-inorganic aerosol. The PITZER modelwas modified and parameterized to betterdescribe atmospheric relevant conditions and mixture compositions. Using the wide range of data for the following systems containing malonic acid (H2Malo): H+? Na+? HMalo-? Cl-?H2Malo ? H2O and H2Malo ? H2SO4? H2O. With these modifications the activities of inorganicsalt solutions and acids are well represented up to high ionic strength. The first model is a result of mixtures containing NaCl, water and either malonic acid, succinic, oxalic, glutaric or adipicat room temperature. The parameterization of direct inorganic/organicinteractions strongly improves the agreement between experimentaland modelled activity coefficients for thediacids/ water/ salt solutions. The system compositions are given in terms of ions in the cases where acid dissociation was considered. Tropospheric aerosols contain a mixture of inorganicsalts, acids, water and organic compounds. Aninteraction between neutral or charged components in such a mixture leads to discrepancies from ideal thermodynamic behavior.Using component activities instead of molar concentrations one can count for this non idea behavior. |
