Heterogeneous ozonation kinetics of phenanthrene at the air-ice interface

T. F. Kahan, D. J. Donaldson

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

Phenanthrene ozonation kinetics were measured on ice at -30 and -10 °C, and on a water surface at 22 °C using glancing angle laser-induced fluorescence. A Langmuir-Hinshelwood type kinetic mechanism was observed on ice. The maximum ozonation rates were a factor of ten higher on ice than on water. No temperature dependence to the kinetics was observed between -30 and -10 °C, suggesting that the differences in the rates on ice and water are due to different physical properties at the two surfaces. Fluorescence spectra of phenanthrene show significant self-association on ice that is not observed on water, adding further evidence for the hypothesis that the quasi-liquid layer at the air-ice interface presents a very different environment to liquid water.

Original languageEnglish (US)
Article number045006
JournalEnvironmental Research Letters
Volume3
Issue number4
DOIs
StatePublished - 2008

Keywords

  • Heterogeneous chemistry
  • Kinetics
  • Ozone
  • Pahs

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)
  • Public Health, Environmental and Occupational Health

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