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Volume 18, issue 10
Atmos. Chem. Phys., 18, 7527–7537, 2018
https://doi.org/10.5194/acp-18-7527-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Atmos. Chem. Phys., 18, 7527–7537, 2018
https://doi.org/10.5194/acp-18-7527-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 May 2018

Research article | 30 May 2018

Gas chromatography using ice-coated fused silica columns: study of adsorption of sulfur dioxide on water ice

Stefan Langenberg1,a and Ulrich Schurath2 Stefan Langenberg and Ulrich Schurath
  • 1Institut für Physikalische und Theoretische Chemie, University of Bonn, Bonn, Germany
  • 2Institut für Umweltphysik, University of Heidelberg, Heidelberg, Germany
  • anow at: Klinik und Poliklinik für Hals-Nasen-Ohrenheilkunde/Chirurgie, University of Bonn, 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 and (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 investigated 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 investigated temperature range. Adsorption enthalpies of −45 ± 5 and −23±2 kJ mol−1 are obtained for acetone and n-hexane.

The motivation of our study was 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.

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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 and (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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