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Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere

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Title
Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere
Other Titles
남극 대기중 요오드 대량 생성 메카니즘 규명
Authors
Kim, Kitae
Choi, Wonyong
Yoon, Ho Il
Min, Dae Wi
Christopher S. Blaszczak-Boxe
Carlos A. Cuevas
Alfonso Saiz-Lopez
Masanori Okumura
Akihiro Yabushita
Issue Date
2016
Citation
Kim, Kitae, et al. 2016. "Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere". ENVIRONMENTAL SCIENCE & TECHNOLOGY, 50(3): 1280-1287.
Abstract
The chemistry of reactive halogens in the polar atmosphere plays important roles in ozone and mercury depletion events, oxidizing capacity, and dimethylsulfide oxidation to form cloud condensation nuclei. Among halogen species, the sources and emission mechanisms of inorganic iodine compounds in the polar boundary layer remain unknown. Here, we demonstrate that the production of triiodide (I3-) via iodide oxidation, which is negligible in aqueous solution, is significantly accelerated in frozen solution ? both in the presence and absence of solar irradiation. Field experiments carried out in the Antarctic region (King George Island, 62°13′S 58°47′W) also showed that the generation of triiodide via solar photooxidation was enhanced when iodide was added to various ice media. The emission of gaseous I2 from the irradiated frozen solution of iodide to the gas phase was detected by using cavity ring down spectroscopy, which was observed both in the frozen state at 253 K and after thawing the ice at 298 K. The accelerated (photo)oxidation of iodide and the subsequent formation of triiodide and I2 in ice appear to be related with the freeze concentration of iodide and dissolved O2 trapped in the ice crystal grain boundaries. We propose that an accelerated abiotic transformation of iodide to gaseous I2 in ice media provides a previously unrecognized formation pathway of active iodine species in the polar atmosphere.
URI
http://repository.kopri.re.kr/handle/201206/7431
DOI
http://dx.doi.org/10.1021/acs.est.5b05148
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