Iodine emission from the reactive uptake of ozone to simulated seawater.
Iodine emission from the reactive uptake of ozone to simulated seawater.
复制标题
模拟海水中臭氧反应吸收产生的碘排放。
DOI：
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
J. Abbatt
中科院分区：
文献类型：
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作者：
S. Schneider;P. Lakey;M. Shiraiwa;J. Abbatt
臭氧与碘化物的非均相反应是大气中碘的重要来源，也是海洋环境中臭氧干沉积的重要途径。虽然该反应产生的碘主要以HOI和I2的形式存在，但也有证据表明，在没有发生生物活性的有机物存在的情况下，挥发性有机碘化合物排放[M]。马蒂诺，g.p. Mills, j.w eltjen和p.s.l iss，表层海水中挥发性有机碘化合物的新来源，地球物理学报。卷。李建军，李建军，李建军，李建军，李建军，李建军，李建军，李建军，李建军，李建军，李建军，李建军，李建军。海洋表层微层对海洋碘排放的影响，环境科学，2009,36,L01609。科学。抛光工艺。中国农业科学，2020,54(4):13228-13237。在这项研究中，我们评估了我们对臭氧分解碘导致气相碘排放的基本理解。为了做到这一点，我们将流动管中臭氧驱动气相I2形成的实验测量结果与表面和体化学动力学多层模型（KM-SUB）的预测结果进行了比较。KM-SUB模型使用当前大气化学模型中使用的文献速率系数来预测含有氯化物、溴化物和碘化物的海洋成分的ph缓冲溶液与仅含碘化物的溶液中I2(g)的形成。实验发现，与只含有碘化物的溶液相比，含有海水氯化物的溶液抑制了I2(g)的形成，但该模型没有使用文献中的速率常数来预测这种影响。然而，在调整两个比反应速率常数后，该模型能够预测这一趋势。为了更接近地代表真实的海洋条件，我们使用假海藻浮游植物培养物产生的物质向代理海水溶液中添加有机成分。虽然臭氧沉积速率不受影响，但在生物有机物质的存在下，I2(g)的形成速率受到强烈抑制，这表明氧化过程中形成的活性碘的吸收或减少。
The heterogeneous reaction of ozone and iodide is both an important source of atmospheric iodine and dry deposition pathway of ozone in marine environments. While the iodine generated from this reaction is primarily in the form of HOI and I2, there is also evidence of volatile organoiodide compound emissions in the presence of organics without biological activity occuring [M. Martino, G. P. Mills, J. Woeltjen and P. S. Liss, A new source of volatile organoiodine compounds in surface seawater, Geophys. Res. Lett., 2009, 36, L01609, L. Tinel, T. J. Adams, L. D. J. Hollis, A. J. M. Bridger, R. J. Chance, M. W. Ward, S. M. Ball and L. J. Carpenter, Influence of the Sea Surface Microlayer on Oceanic Iodine Emissions, Environ. Sci. Technol., 2020, 54, 13228-13237]. In this study, we evaluate our fundamental understanding of the ozonolysis of iodide which leads to gas-phase iodine emissions. To do this, we compare experimental measurements of ozone-driven gas-phase I2 formation in a flow tube to predictions made with the kinetic multilayer model for surface and bulk chemistry (KM-SUB). The KM-SUB model uses literature rate coefficients used in current atmospheric chemistry models to predict I2(g) formation in pH-buffered solutions of marine composition containing chloride, bromide, and iodide compared to solutions containing only iodide. Experimentally, I2(g) formation was found to be suppressed in solutions containing seawater levels of chloride compared to solutions containing only iodide, but the model does not predict this effect using literature rate constants. However, the model is able to predict this trend upon adjustment of two specific reaction rate constants. To more closely represent true oceanic conditions, we add an organic component to the proxy seawater solutions using material generated from Thalassiosira pseudonana phytoplankton cultures. Whereas the rate of ozone deposition is unaffected, the formation rate of I2(g) is strongly suppressed in the presence of biological organic material, indicative of a sink or reduction of reactive iodine formed during the oxidation process.