2024-03-28T08:40:35Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1519992019-04-30T07:02:58Zcom_10261_34com_10261_5com_10261_135com_10261_4col_10261_287col_10261_388
2017-06-26T08:20:34Z
urn:hdl:10261/151999
Photolysis of frozen iodate salts as a source of active iodine in the polar environment
Gálvez, Óscar
Baeza-Romero, M. T.
Sanz, M.
Saiz-Lopez, A.
Fundación Española para la Ciencia y la Tecnología
Ministerio de Ciencia e Innovación (España)
Ministerio de Economía y Competitividad (España)
SCOAP
11 pags.; 6 figs.; 3 tabs. ; Open Access funded by Creative Commons Atribution Licence 3.0
Reactive halogens play a key role in the oxidation capacity of the polar troposphere. However, sources and mechanisms, particularly those involving active iodine, are still poorly understood. In this paper, the photolysis of an atmospherically relevant frozen iodate salt has been experimentally studied using infrared (IR) spectroscopy. The samples were generated at low temperatures in the presence of different amounts of water. The IR spectra have confirmed that, under near-ultraviolet-visible (UV-Vis) radiation, iodate is efficiently photolysed. The integrated IR absorption coefficient of the iodate anion on the band at 750 cm has been measured to be A=9.8±0.5×10.17 cm molecule. The photolysis rate of the ammonium iodate salt was measured by monitoring the decay of ammonium or iodate IR bands (1430 and 750 cm respectively) in the presence of a solar simulator. The absorption cross section of the liquid solutions of ammonium iodate at wavelengths relevant for the troposphere (250 to 400 nm) has been obtained and used to estimate the photolytic quantum yield for the frozen salt. Finally, using an atmospheric model, constrained with the experimental data, we suggest that the photolysis of iodate in frozen salt can potentially provide a pathway for the release of active iodine to the polar atmosphere. © Author(s) 2016
2017-06-26T08:20:34Z
2017-06-26T08:20:34Z
2016-10-12
2017-06-26T08:20:34Z
artículo
Atmospheric Chemistry and Physics 16: 12703-12713 (2016)
http://hdl.handle.net/10261/151999
10.5194/acp-16-12703-2016
http://dx.doi.org/10.13039/501100004837
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100011100
eng
Publisher's version
http://doi.org/10.5194/acp-16-12703-2016
Sí
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL2013-48415-C2-1-R
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL2013-48415-C2-2-R
http://creativecommons.org/licenses/by/3.0/
openAccess
European Geophysical Society