Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide

Implication for Polar Atmosphere

Kitae Kim, Akihiro Yabushita, Masanori Okumura, Alfonso Saiz-Lopez, Carlos A. Cuevas, Christopher S. Blaszczak-Boxe, Dae Wi Min, Ho Il Yoon, Wonyong Choi

    Research output: Contribution to journalArticle

    26 Citations (Scopus)

    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 tri-iodide (I3 -) via iodide oxidation, which is negligible in aqueous solution, is significantly accelerated in frozen solution, both in the presence and the 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 tri-iodide via solar photo-oxidation 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 tri-iodide 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.

    Original languageEnglish
    Pages (from-to)1280-1287
    Number of pages8
    JournalEnvironmental Science and Technology
    Volume50
    Issue number3
    DOIs
    Publication statusPublished - Feb 2 2016

    Fingerprint

    iodide
    Iodides
    iodine
    Iodine
    Ice
    atmosphere
    ice
    Halogens
    Photooxidation
    photooxidation
    halogen
    Iodine Compounds
    oxidation
    Oxidation
    dimethylsulfide
    Thawing
    cloud condensation nucleus
    Ozone
    ice crystal
    thawing

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Environmental Chemistry

    Cite this

    Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide : Implication for Polar Atmosphere. / Kim, Kitae; Yabushita, Akihiro; Okumura, Masanori; Saiz-Lopez, Alfonso; Cuevas, Carlos A.; Blaszczak-Boxe, Christopher S.; Min, Dae Wi; Yoon, Ho Il; Choi, Wonyong.

    In: Environmental Science and Technology, Vol. 50, No. 3, 02.02.2016, p. 1280-1287.

    Research output: Contribution to journalArticle

    Kim, K, Yabushita, A, Okumura, M, Saiz-Lopez, A, Cuevas, CA, Blaszczak-Boxe, CS, Min, DW, Yoon, HI & Choi, W 2016, 'Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere', Environmental Science and Technology, vol. 50, no. 3, pp. 1280-1287. https://doi.org/10.1021/acs.est.5b05148
    Kim, Kitae ; Yabushita, Akihiro ; Okumura, Masanori ; Saiz-Lopez, Alfonso ; Cuevas, Carlos A. ; Blaszczak-Boxe, Christopher S. ; Min, Dae Wi ; Yoon, Ho Il ; Choi, Wonyong. / Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide : Implication for Polar Atmosphere. In: Environmental Science and Technology. 2016 ; Vol. 50, No. 3. pp. 1280-1287.
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