Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Mechanism and kinetics of the uptake of N2O5 and ClNO2 by aqueous solutions

: Behnke, W.; Frenzel, A.; George, C.; Scheer, V.; Zetzsch, C.

Annales Geophysicae 13 (1995), Supplement 2, S.C377
ISSN: 0939-4176
ISSN: 0980-8752
ISSN: 0992-7689
ISSN: 0980-8760
ISSN: 1432-0576
European Geographical Society (General Assembly) <20, 1995, Hamburg>
Fraunhofer ITA ( ITEM) ()
aerosol; air pollution; atmospheric chemistry; chemical reaction; chlorine compound; chlorine dioxide; nitrogen compound; nitrogen pentoxide; physical chemistry; theoretical chemistry; water chemistry

It was believed that the only possible reaction of N2O5 with "atmospheric water" was to generate HNO3 that is subsequently removed by wet and dry deposition. However, we have recently shown that N2O5 is efficiently transformed to other products when reacting with droplets containing ions such as chloride and bromide. In these latter cases, we have observed the formation of the corresponding photolabile nitryl halide (XNO2), even in dilute solutions according to a complex mechanism: N2O5 + X -> (NO2 + NO3) + X -> XNO2 + NO3. We investigated the kinetics involved in the product yields and in the uptake rate of the nitryl halide using the wetted-wall flow tube technique. Current results, including the influence of ion strength, salting-out and a reaction mechanism will be presented. The impact of this chemistry on the atmosphere will be discussed.