Iodine emission in the presence of humic substances at the water's surface

Sayaka Hayase; Akihiro Yabushita; Masahiro Kawasaki

doi:10.1021/jp2048234

Iodine emission in the presence of humic substances at the water's surface

Sayaka Hayase, Akihiro Yabushita, Masahiro Kawasaki

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

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, O ₃(g), with aqueous iodide, I ^-(aq), in the presence of standard fulvic acid, humic acid, or alcohol, cavity ring-down spectroscopy was used to detect gaseous products, iodine, I ₂(g) and an iodine monoxide radical, IO(g). Fulvic acid enhanced the I ₂(g) production yield, but not the IO(g) yield. Humic acid, n-hexanol, n-heptanol, and n-octanol did not affect the yields of I ₂(g) or IO(g). We can infer that the carboxylic group contained in fulvic acid promotes the I ₂(g) emission by supplying the requisite interfacial protons more efficiently than water on its surface.

Original language	English
Pages (from-to)	5779-5783
Number of pages	5
Journal	Journal of Physical Chemistry A
Volume	116
Issue number	24
DOIs	https://doi.org/10.1021/jp2048234
Publication status	Published - Jun 21 2012
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry

Access to Document

10.1021/jp2048234

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abstract = "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, O 3(g), with aqueous iodide, I -(aq), in the presence of standard fulvic acid, humic acid, or alcohol, cavity ring-down spectroscopy was used to detect gaseous products, iodine, I 2(g) and an iodine monoxide radical, IO(g). Fulvic acid enhanced the I 2(g) production yield, but not the IO(g) yield. Humic acid, n-hexanol, n-heptanol, and n-octanol did not affect the yields of I 2(g) or IO(g). We can infer that the carboxylic group contained in fulvic acid promotes the I 2(g) emission by supplying the requisite interfacial protons more efficiently than water on its surface.",

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T1 - Iodine emission in the presence of humic substances at the water's surface

AU - Hayase, Sayaka

AU - Yabushita, Akihiro

AU - Kawasaki, Masahiro

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N2 - 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, O 3(g), with aqueous iodide, I -(aq), in the presence of standard fulvic acid, humic acid, or alcohol, cavity ring-down spectroscopy was used to detect gaseous products, iodine, I 2(g) and an iodine monoxide radical, IO(g). Fulvic acid enhanced the I 2(g) production yield, but not the IO(g) yield. Humic acid, n-hexanol, n-heptanol, and n-octanol did not affect the yields of I 2(g) or IO(g). We can infer that the carboxylic group contained in fulvic acid promotes the I 2(g) emission by supplying the requisite interfacial protons more efficiently than water on its surface.

AB - 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, O 3(g), with aqueous iodide, I -(aq), in the presence of standard fulvic acid, humic acid, or alcohol, cavity ring-down spectroscopy was used to detect gaseous products, iodine, I 2(g) and an iodine monoxide radical, IO(g). Fulvic acid enhanced the I 2(g) production yield, but not the IO(g) yield. Humic acid, n-hexanol, n-heptanol, and n-octanol did not affect the yields of I 2(g) or IO(g). We can infer that the carboxylic group contained in fulvic acid promotes the I 2(g) emission by supplying the requisite interfacial protons more efficiently than water on its surface.

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