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Weak Acids Enhance Halogen Activation on Atmospheric Water’s Surfaces

Hayase, Sayaka and Yabushita, Akihiro and Kawasaki, Masahiro and Enami, Shinichi and Hoffmann, Michael R. and Colussi, Agustín J. (2011) Weak Acids Enhance Halogen Activation on Atmospheric Water’s Surfaces. Journal of Physical Chemistry A, 115 (19). pp. 4935-4940. ISSN 1089-5639.

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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.

Item Type:Article
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URLURL TypeDescription
Enami, Shinichi0000-0002-2790-7361
Hoffmann, Michael R.0000-0001-6495-1946
Colussi, Agustín J.0000-0002-3400-4101
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.
Funding AgencyGrant Number
Ministry of Education, Culture, Sports, Science and Technology (MEXT)20245005
Japan Society for the Promotion of Science (JSPS)UNSPECIFIED
Issue or Number:19
Record Number:CaltechAUTHORS:20110607-112840108
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Official Citation:Weak Acids Enhance Halogen Activation on Atmospheric Water’s Surfaces Sayaka Hayase, Akihiro Yabushita, Masahiro Kawasaki, Shinichi Enami, Michael R. Hoffmann, Agustn J. Colussi The Journal of Physical Chemistry A 2011 115 (19), 4935-4940
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23930
Deposited By: Ruth Sustaita
Deposited On:07 Jun 2011 19:51
Last Modified:03 Mar 2020 13:01

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