Abstract

The chemical reactions of water droplets containing dissolved salts and of solid salt particles with ammonia gas have been studied. The salts used were MgCl₂*6H₂O, KNO₃, and MgSO₄. In contrast to the irreversible formation of a solid ammonium chloride shell when MgCl₂*6H₂O dissolved in water droplets is used, we observed formation of solid microcrystals when using KNO₃ together with ammonia, whereas no reaction was observed in the case of MgSO₄. All three inorganic salts act similarly as a sink for ammonia gas, resulting in solid or dissolved NH₄⁺ components. Only the system KNO₃/NH₄NO₃ can act as source dependent on the concentration of ammonia gas.

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