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The continuous sampling FTIR/AFT (aerosol flow tube) has been constructed in the present work, leading to the in situ observation of the supersaturated solutions of MgSO4 and NaCIO4 aerosols. The observation suggests that the MgSO4 aerosol show serious mass transfer limitation at low RH (relative humidity), while the NaClO4 aerosol deliquesce without notable effect of kinetic factors. It is also shown that the v3 band of SO2- is very sensitive to the formation of contact ion pairs in the supersaturated solutions of MgSO4 aerosol.