Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere
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...
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2016
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Online Access: | http://hdl.handle.net/10261/142179 https://doi.org/10.1021/acs.est.5b05148 |
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ftcsic:oai:digital.csic.es:10261/142179 2024-02-11T09:58:07+01:00 Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere Kim, K. Yabushita, A. Okumura, M. Saiz-Lopez, A. Cuevas, Carlos A. Blaszczak-Boxe, C.S. Min, D.W. Yoon, H.I. Choi, W. 2016 http://hdl.handle.net/10261/142179 https://doi.org/10.1021/acs.est.5b05148 unknown American Chemical Society Sí doi:10.1021/acs.est.5b05148 issn: 1520-5851 Environmental Science and Technology 50: 1280- 1287 (2016) http://hdl.handle.net/10261/142179 none artículo http://purl.org/coar/resource_type/c_6501 2016 ftcsic https://doi.org/10.1021/acs.est.5b05148 2024-01-16T10:19:39Z 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 (I ) 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 I 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 I in ice appear to be related with the freeze concentration of iodide and dissolved O trapped in the ice crystal grain boundaries. We propose that an accelerated abiotic transformation of iodide to gaseous I in ice media provides a previously unrecognized formation pathway of active iodine species in the polar atmosphere. Peer Reviewed Article in Journal/Newspaper Antarc* Antarctic King George Island Digital.CSIC (Spanish National Research Council) Antarctic King George Island The Antarctic Environmental Science & Technology 50 3 1280 1287 |
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Open Polar |
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Digital.CSIC (Spanish National Research Council) |
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ftcsic |
language |
unknown |
description |
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 (I ) 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 I 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 I in ice appear to be related with the freeze concentration of iodide and dissolved O trapped in the ice crystal grain boundaries. We propose that an accelerated abiotic transformation of iodide to gaseous I in ice media provides a previously unrecognized formation pathway of active iodine species in the polar atmosphere. Peer Reviewed |
format |
Article in Journal/Newspaper |
author |
Kim, K. Yabushita, A. Okumura, M. Saiz-Lopez, A. Cuevas, Carlos A. Blaszczak-Boxe, C.S. Min, D.W. Yoon, H.I. Choi, W. |
spellingShingle |
Kim, K. Yabushita, A. Okumura, M. Saiz-Lopez, A. Cuevas, Carlos A. Blaszczak-Boxe, C.S. Min, D.W. Yoon, H.I. Choi, W. Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere |
author_facet |
Kim, K. Yabushita, A. Okumura, M. Saiz-Lopez, A. Cuevas, Carlos A. Blaszczak-Boxe, C.S. Min, D.W. Yoon, H.I. Choi, W. |
author_sort |
Kim, K. |
title |
Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere |
title_short |
Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere |
title_full |
Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere |
title_fullStr |
Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere |
title_full_unstemmed |
Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere |
title_sort |
production of molecular iodine and tri-iodide in the frozen solution of iodide: implication for polar atmosphere |
publisher |
American Chemical Society |
publishDate |
2016 |
url |
http://hdl.handle.net/10261/142179 https://doi.org/10.1021/acs.est.5b05148 |
geographic |
Antarctic King George Island The Antarctic |
geographic_facet |
Antarctic King George Island The Antarctic |
genre |
Antarc* Antarctic King George Island |
genre_facet |
Antarc* Antarctic King George Island |
op_relation |
Sí doi:10.1021/acs.est.5b05148 issn: 1520-5851 Environmental Science and Technology 50: 1280- 1287 (2016) http://hdl.handle.net/10261/142179 |
op_rights |
none |
op_doi |
https://doi.org/10.1021/acs.est.5b05148 |
container_title |
Environmental Science & Technology |
container_volume |
50 |
container_issue |
3 |
container_start_page |
1280 |
op_container_end_page |
1287 |
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1790593693472784384 |