Weak acids enhance halogen activation on atmospheric water's surfaces |
| |
Authors: | Hayase Sayaka Yabushita Akihiro Kawasaki Masahiro Enami Shinichi Hoffmann Michael R Colussi Agustín J |
| |
Institution: | Department of Molecular Engineering, Kyoto University, Kyoto 615-8510, Japan. |
| |
Abstract: | 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. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|