Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-1118
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
14 Dec 2016
Review status
A revision of this discussion paper was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
Efficient bulk mass accommodation of N2O5 into 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, in presence of aerosol phase nitrate efficient exchange of labeled nitrate with the non-labeled nitrate pool was observed. The experiments provide direct evidence for efficient bulk mass accommodation of N2O5 into aqueous solution with an accommodation coefficient >0.4 at room temperature, as well as for the fast disproportionation into nitronium and nitrate. While for experimental reasons this study is limited to non-acidic aerosol, it is likely that mass accommodation is not limiting N2O5 uptake also under wider ranges of conditions.

Citation: Gržinić, G., Bartels-Rausch, T., Türler, A., and Ammann, M.: Efficient bulk mass accommodation of N2O5 into neutral aqueous aerosol, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1118, in review, 2016.
Goran Gržinić et al.
Goran Gržinić et al.

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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 exchange with aqueous aerosol particles, 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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