Direct emission of I 2 molecule and IO radical from the heterogeneous reactions of gaseous ozone with aqueous potassium iodide solution

Yosuke Sakamoto, Akihiro Yabushita, Masahiro Kawasaki, Shinichi Enami

Research output: Contribution to journalArticle

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Abstract

Recent studies indicated that gaseous halogens mediate key tropospheric chemical processes. The inclusion of halogen-ozone chemistry in atmospheric box models actually closes the ∼50% gap between estimated and measured ozone losses in the marine boundary layer. The additional source of gaseous halogens is deemed to involve previously unaccounted for reactions of O 3(g) with sea surface water and marine aerosols. Here, we report that molecular iodine, I 2(g), and iodine monoxide radical, IO(g), are released ([I 2(g)] > 100[IO(g)]) during the heterogeneous reaction of gaseous ozone, O 3(g), with aqueous potassium iodide, KI(aq). It was found that (1) the amounts of I 2(g) and IO(g) produced are directly proportional to [KI(aq)] up to 5 mM and (2) IO(g) yields are independent of bulk pH between 2 and 11, whereas I 2(g) production is markedly enhanced at pH < 4. We propose that O 3(g) reacts with I - at the air/water interface to produce I 2(g) and IO(g) via HOI and IOOO - intermediates, respectively.

Original languageEnglish
Pages (from-to)7707-7713
Number of pages7
JournalJournal of Physical Chemistry A
Volume113
Issue number27
DOIs
Publication statusPublished - Jul 9 2009

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potassium iodides
Potassium Iodide
Halogens
Ozone
halogens
ozone
Iodine
iodine
Molecules
molecules
sea water
Aerosols
surface water
Surface waters
boxes
boundary layers
aerosols
Boundary layers
inclusions
chemistry

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

Cite this

Direct emission of I 2 molecule and IO radical from the heterogeneous reactions of gaseous ozone with aqueous potassium iodide solution. / Sakamoto, Yosuke; Yabushita, Akihiro; Kawasaki, Masahiro; Enami, Shinichi.

In: Journal of Physical Chemistry A, Vol. 113, No. 27, 09.07.2009, p. 7707-7713.

Research output: Contribution to journalArticle

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AU - Enami, Shinichi

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