Weak acids enhance halogen activation on atmospheric waters surfaces

Sayaka Hayase, Akihiro Yabushita, Masahiro Kawasaki, Shinichi Enami, Michael R. Hoffmann, Agustín J. Colussi

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


We report that rates of I2(g) emissions, measured via cavity ring-down spectroscopy, during the heterogeneous ozonation of interfacial iodide: I-(surface, s) + O3(g) + H+(s) →→ I2(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 I2(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 oceans topmost films should enhance I2(g) production in marine boundary layers.

Original languageEnglish
Pages (from-to)4935-4940
Number of pages6
JournalJournal of Physical Chemistry A
Issue number19
Publication statusPublished - May 19 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry


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