Abstract
Investigations of chemical properties of atmospheric aerosol particles were performed. Application of the spot techniques to individual ammonium containing particles in the urban site of Karlsruhe revealed the following results: (NH 4) 2SO 4 particles dominate the sub-μm size range, only a few particles of (NH 4) 3H(SO 4) 2 or NH 4HSO 4 were detected. Mixed sulfates and nitrates of ammonium and some particles of calcium/ammonium salts were found in the μm-size range. Reaction spots containing particles in the characteristic form of alkali nitrate were found only during a smog day in January.
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