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Iodide conversion to iodate in aqueous and solid aerosols exposed to ozone.
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2020-02-26 , DOI: 10.1039/c9cp05601g
Carolina Moreno 1 , María-Teresa Baeza-Romero , Mikel Sanz , Óscar Gálvez , Vicente López Arza , James C Ianni , Eva Espíldora
Affiliation  

The aqueous-phase and surface reactions of ozone (O3) 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 (IO3-) 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 O3 adsorption (product I2-) or in the aqueous phase via O3 solvation (product IO-). The surface reaction of ozone with solid KI in the presence of water vapor forms KIO3, 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.

中文翻译:

在暴露于臭氧的水性和固态气溶胶中,碘化物转化为碘酸盐。

最近发现,在海水中/上的臭氧(O3)与碘化物(I-)的水相和表面反应是大气中碘的重要来源。此外,臭氧还会与固体和水性海盐气溶胶中的I-反应。但是,臭氧与I-的多相反应的主要产物尚未弄清。在本文中,固体和水性KI气溶胶已在气溶胶流量管系统中暴露于臭氧中,并通过UV-Vis光谱法测量了I-和碘酸盐(IO3-)的浓度。这些实验的结果已与动力学模型相结合,以阐明水和表面反应的主要产物。根据臭氧是通过O3吸附在表面发生(产物I2-),还是通过O3溶剂化在水相中发生(产物IO-),推断臭氧与碘化物的反应会产生不同的产物。在水蒸气存在下,臭氧与固体KI的表面反应形成KIO3和其他可能是气态的物质。尽管已经在气雾剂中研究了反应,但是结果也可以外推到水溶液中。
更新日期:2020-03-12
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