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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 17, 6493-6502, 2017
https://doi.org/10.5194/acp-17-6493-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
01 Jun 2017
Efficient bulk mass accommodation and dissociation of N2O5 in neutral aqueous aerosol
Goran Gržinić1,2, Thorsten Bartels-Rausch1, Andreas Türler2,3, and Markus Ammann2 1Laboratory of Environmental Chemistry, Paul Scherrer Institut, Villigen, 5232, Switzerland
2Department of Chemistry and Biochemistry, University of Bern, Bern, 3012, Switzerland
3Laboratory of Radiochemistry, Paul Scherrer Institut, Villigen, 5232, Switzerland
Abstract. An isotope exchange experiment with the short-lived radioactive tracer 13N is used to trace N2O5 uptake into nitrate-containing aqueous aerosol particles. While uptake of 13N-labelled N2O5 to deliquesced Na2SO4 aerosol is consistent with previous studies, efficient exchange of labelled nitrate with the non-labelled nitrate pool was observed in the presence of aerosol-phase nitrate. The experiments provide direct evidence for efficient bulk mass accommodation of N2O5 into aqueous solution with αb > 0.4 at room temperature, as well as for the fast dissociation into nitronium and nitrate. While for experimental reasons this study is limited to non-acidic nitrate-containing aerosol, it is likely that bulk mass accommodation and dissociation are not limiting N2O5 uptake under wider ranges of conditions.

Citation: Gržinić, G., Bartels-Rausch, T., Türler, A., and Ammann, M.: Efficient bulk mass accommodation and dissociation of N2O5 in neutral aqueous aerosol, Atmos. Chem. Phys., 17, 6493-6502, https://doi.org/10.5194/acp-17-6493-2017, 2017.
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Short summary
Nitrogen oxides (NOx) largely control the ozone budget in the troposphere globally. Dinitrogen pentoxide (N2O5) is an important species as a nighttime reservoir for nitrogen oxides. Loss of N2O5 to aerosol particles is therefore important for the budget of NOx and the oxidation capacity. Here we provide direct evidence for its efficient accommodation into aqueous aerosol particles and its fast dissociation, which has not been elucidated as directly in previous studies.
Nitrogen oxides (NOx) largely control the ozone budget in the troposphere globally. Dinitrogen...
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