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HERO ID
1689315
Reference Type
Journal Article
Subtype
Letter
Title
Direct emission of I2 molecule and IO radical from the heterogeneous reactions of gaseous ozone with aqueous potassium iodide solution
Author(s)
Sakamoto, Y; Yabushita, A; Kawasaki, M; Enami, S
Year
2009
Is Peer Reviewed?
1
Journal
Journal of Physical Chemistry A
ISSN:
1089-5639
EISSN:
1520-5215
Volume
113
Issue
27
Page Numbers
7707-7713
Language
English
PMID
19530668
DOI
10.1021/jp903486u
Web of Science Id
WOS:000267694800001
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 approximately 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.
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