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 |
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Pages (from-to) | 5779-5783 |
Number of pages | 5 |
Journal | Journal of Physical Chemistry A |
Volume | 116 |
Issue number | 24 |
DOIs | |
Publication status | Published - Jun 21 2012 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry