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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-800
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
01 Dec 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Gas-Chromatography using ice coated fused silica-columns: Study of adsorption of sulfur dioxide on water-ice
Stefan Langenberg1,a and Ulrich Schurath2 1Institut für Physikalische und Theoretische Chemie, University of Bonn, Bonn, Germany
2Institut für Umweltphysik, University of Heidelberg, Germany
anow at: Klinik und Poliklinik für Hals-Nasen-Ohrenheilkunde/Chirurgie, University of Bonn, Germany
Abstract. The well-established technique of gas chromatography is used to investigate interactions of sulfur dioxide with a crystalline ice film in a fused silica wide-bore column. Peak shape analysis of SO2 chromatograms measured in the temperature range 205–265 K is applied to extract parameters describing a combination of three processes: (i) physisorption of SO2 at the surface; (ii) dissociative reaction with water; (iii) slow uptake into bulk ice. Process (ii) is described by a dissociative Langmuir isotherm. The pertinent monolayer saturation capacity is found to increase with temperature. The impact of process (iii) on SO2 peak retention time is found to be negligible under our experimental conditions.

By analyzing binary chromatograms of hydrophobic n-hexane and hydrophilic acetone, the premelt surface layer is probed in the temperature range 221–263 K possibly giving rise to irregular adsorption. Both temperature dependencies fit simple van't Hoff equations as expected for process (i), implying that irregular adsorption of acetone is negligible in the probed temperature range. Adsorption enthalpies of −45 ± 5 kJ mol−1 and −23 ± 2 kJ mol−1 are obtained for acetone and n-hexane.

Our study was motivated to assess the vertical displacement of SO2 and acetone in the wake of aircraft by adsorption on ice particles and their subsequent sedimentation. Our results suggest that this transport mechanism is negligible.


Citation: Langenberg, S. and Schurath, U.: Gas-Chromatography using ice coated fused silica-columns: Study of adsorption of sulfur dioxide on water-ice, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-800, in review, 2017.
Stefan Langenberg and Ulrich Schurath
Stefan Langenberg and Ulrich Schurath
Stefan Langenberg and Ulrich Schurath

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Short summary
The processes of the interaction of sulfur dioxide with water ice are still not fully understood. We demonstrate how the well-established technique of gas chromatography can be used to investigate interactions of sulfur dioxide with a crystalline ice film deposited in a fused silica wide-bore column. Our experiments reveal that the interaction is a combination of three processes: (i) physisorption; (ii) dissociative reaction with water; (iii) slow uptake into bulk ice.
The processes of the interaction of sulfur dioxide with water ice are still not fully...
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