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

Sayaka Hayase, Akihiro Yabushita, Masahiro Kawasaki

Research output: Contribution to journalArticlepeer-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 languageEnglish
Pages (from-to)5779-5783
Number of pages5
JournalJournal of Physical Chemistry A
Volume116
Issue number24
DOIs
Publication statusPublished - Jun 21 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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