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Production and decay of ClNO2 from the reaction of faseous N2O5 with NaCl solution: Bulk and aerosol experiments

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


Journal of geophysical research. D, Atmospheres 102 (1997), No.3, pp.3795-3804
ISSN: 0148-0227
Journal Article
Fraunhofer ITA ( ITEM) ()
aerosol; air pollution; atmospheric chemistry; nitryl chloride; photochemistry; smog chamber; sodium chloride; theoretical chemistry; troposphere

The chemistry of N2O5 on liquid NaCl aerosols or bulk NaCl solutions was studied at 291 K by aerosol smog chamber and wetted-wall flow tube experiments. The uptake of N2O5 on deliquescent aerosol was obtained to be (3.2 +/- 0.2) x 10 (hoch minus)2 (...) from the aerosol experiments In the wetted-wall flow tube we observed that nitryl chloride (ClNO2) is the main product of the reaction of NaCl concentrations larger than approximately o.5 M and almost the only product at concentrations larger than M. The ClNO2 yield does not depend linearly on the NaCl concentration, especially at small sodium chloride concentrations (...). It appeared that a simple mechanism where N2O5 undergoes two reaction channels (hydrolysis and reaction with Cl -) is unable to explain the observed concentration dependence of the product yield. We propose that N2O5 dissociates to NO2+ and NO3- (...) mainly. (Abstract truncated)