AI Article Synopsis
- The study reveals that ozone reactions with iodide in seawater contribute significantly to atmospheric iodine levels.
- The experiments involved exposing solid and dissolved KI aerosols to ozone and measuring the resulting iodide and iodate concentrations using UV-Vis spectroscopy.
- The findings indicate different primary products from ozone interactions depending on whether they occur on surfaces or in the liquid phase, with implications for both aerosol and aqueous environments.
Article Abstract
The aqueous-phase and surface reactions of ozone (O) with iodide (I) in/on seawater have been recently found to be a strong atmospheric source of iodine. In addition, ozone also reacts with I in solid and aqueous sea-salt aerosol. However, the primary products of the heterogeneous reactions of ozone with I have not been clarified. In this paper, solid and aqueous KI aerosols have been exposed to ozone in an aerosol flow tube system and I and iodate (IO) concentrations have been measured by UV-Vis spectroscopy. The results of these experiments have been combined with a kinetic model to elucidate the primary products of the aqueous and surface reactions. The reaction of ozone with aqueous iodide has been inferred to originate different products depending on whether it occurs at the surface via O adsorption (product I) or in the aqueous phase via O solvation (product IO). The surface reaction of ozone with solid KI in the presence of water vapor forms KIO, and other species, which are likely to be gaseous. Although the reactions have been studied in aerosols, the results can be extrapolated to aqueous solutions as well.
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| http://dx.doi.org/10.1039/c9cp05601g | DOI Listing |
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