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Published May 19, 2011 | Supplemental Material
Journal Article Open

Weak Acids Enhance Halogen Activation on Atmospheric Water's Surfaces


We report that rates of I_2(g) emissions, measured via cavity ring-down spectroscopy, during the heterogeneous ozonation of interfacial iodide: I^–(surface, s) + O_3(g) + H+(s) →→ I_2(g), are enhanced several-fold, whereas those of IO·(g) are unaffected, by the presence of undissociated alkanoic acids on water. The amphiphilic weak carboxylic acids appear to promote I_2(g) emissions by supplying the requisite interfacial protons H^+(s) more efficiently than water itself, at pH values representative of submicrometer marine aerosol particles. We infer that the organic acids coating aerosol particles ejected from ocean's topmost films should enhance I_2(g) production in marine boundary layers.

Additional Information

© 2011 American Chemical Society. Received: March 07, 2011. Revised: April 07, 2011. Publication Date (Web): April 22, 2011. S.E. is grateful to the JSPS Postdoctoral Fellowships for Research Abroad. This work was supported by the Ministry of Education, Japan, a Grant-in-Aid (20245005), and the U.S. National Science Foundation, Grant AGS-0964853.

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