Author(s)

G. Lammel

Abstract

Fog chemistry was studied with particular emphasis on the reduced species of sulfur and nitrogen, S(IV) and N(lll), in a polluted source region in Germany. Immediately after sampling, S(IV) and N(lll) were preserved by appropriate derivatization methods for later analyses. A differentiation was carried out between non-oxidizable S(IV) species and total Fogwater contained high concentrations of various pollutants but only little or no acidity. While significant concentrations of N(lll) were found, namely 3 - 52 umol L'\ oxidizable S(IV) was in the range 0.006 - 0.28 mmol L' A two-phase chemical box model is used to interprete the chemistry. In a .first step simulations were performed under the assumption that phase equilibrium was continuously maintained. It is concluded that S(IV) enrichment occurred resulting from phase part

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