Iodine Emission in the Presence of Humic Substances at the Water鈥檚 Surface

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• 作者：Sayaka Hayase ; Akihiro Yabushita ; Masahiro Kawasaki
• 刊名：The Journal of Physical Chemistry A
• 出版年：2012
• 出版时间：June 21, 2012
• 年：2012
• 卷：116
• 期：24
• 页码：5779-5783
• 全文大小：237K
• 年卷期：v.116,no.24(June 21, 2012)
• ISSN：1520-5215

文摘

Humic substances that preferentially adsorb at the air/water interfaces of water or aerosols consist of both fulvic and humic acid. To investigate the chemical reactivity for the heterogeneous reaction of gaseous ozone, O₃(g), with aqueous iodide, I^{鈥?/sup>(aq), in the presence of standard fulvic acid, humic acid, or alcohol, cavity ring-down spectroscopy was used to detect gaseous products, iodine, I₂(g) and an iodine monoxide radical, IO(g). Fulvic acid enhanced the I₂(g) production yield, but not the IO(g) yield. Humic acid, n-hexanol, n-heptanol, and n-octanol did not affect the yields of I₂(g) or IO(g). We can infer that the carboxylic group contained in fulvic acid promotes the I₂(g) emission by supplying the requisite interfacial protons more efficiently than water on its surface.}