The main source of atmospheric iodine is the heterogeneous reaction of aqueous iodide (I⁻) with ozone (O₃), which takes place in surface seawater and probably in sea-salt aerosols. However, there are seemingly contradictory conclusions about whether this heterogeneous reaction occurs in the bulk of the aqueous phase, via O₃ dissolution, or at the aqueous surface, via O₃ adsorption. In this work, the ozone uptake coefficient has been calculated as a function of the concentration of aqueous iodide ([I⁻]_aq) and gaseous ozone near the aqueous surface ([O₃]_gs) by estimating parameters of the resistor model using results of previous studies. The calculated uptake coefficients suggest that the aqueous-phase reaction dominates at low I⁻ concentrations (about <10⁻⁴ mol L⁻¹), regardless of [O₃]_gs, and also at sufficiently high [O₃]_gs (about >80 ppm), regardless of [I⁻]_aq. In contrast, the surface reaction dominates at high [I⁻]_aq (about >10⁻⁴ mol L⁻¹) as long as [O₃]_gs is low enough (about <80 ppm). This trend is able to reconcile previous studies of this reaction, and is a consequence of several factors, including the high surface excess of both reactants ozone and iodide. Given the typical O₃ concentrations in the troposphere and the possible I⁻ concentrations and O₃ solubilities in sea-salt aerosols, the surface reaction may compete with the aqueous-phase reaction in accumulation-mode aerosols, unlike in surface seawater, where the aqueous-phase reaction probably prevails. The rate constant of the surface reaction has been estimated as (3–40) × 10⁻¹³ cm² molecule⁻¹ s⁻¹.

中文翻译：

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重温气态臭氧与碘水溶液的相互作用。估计表面反应和本体反应的贡献†

大气碘的主要来源是含水碘（I非均相反应^- ）与臭氧（O ₃），其发生在表面海水并可能在海盐气溶胶。但是，关于这种非均相反应是发生在大部分水相中（通过O ₃溶解）还是在水表面（通过O ₃吸附）发生，似乎存在矛盾的结论。在这项工作中，吸收系数臭氧已被计算为含水碘的浓度的函数（[I ^- ]_水溶液）和气态臭氧附近的水性表面（〔O ₃ ] _GS），然后使用先前的研究结果估算电阻器模型的参数。摄取系数计算表明，水相反应占优势在低I ^-浓度（约<10 ^-4摩尔大号^-1），不管〔O ₃ ] _GS，以及在足够高的〔O ₃ ] _GS（约>为80ppm），不管[I的^- ]_水溶液。相反，在高表面反应占主导地位[I ^- ]_水溶液（约> 10 ^-4摩尔大号^-1），只要〔O ₃ ] _GS足够低（约<80 ppm）。这种趋势能够调和先前对该反应的研究结果，并且是多种因素共同作用的结果，其中包括反应物臭氧和碘化物的表面高度过量。给定典型Ó _3倍在对流层的浓度和可能的I ^-浓度和O ₃在海盐气溶胶溶解度，表面反应可以在表面海水，其中含水在积累型气溶胶的水相反应竞争，不像相反应可能占主导。表面反应的速率常数估计为（3-40）×10 ^-13 cm ²分子^-1 s ^-1。