Nitrite-Induced Activation of Iodate into Molecular Iodine in Frozen Solution
SCIE
SCOPUS
- Title
- Nitrite-Induced Activation of Iodate into Molecular Iodine in Frozen Solution
- Authors
- Kim, K.; Ju, J.; Kim, B.; Chung, H.Y.; Vetráková, L.; Heger, D.; Saiz-Lopez, A.; Choi, W.; Kim, J.
- Date Issued
- 2019-05
- Publisher
- AMER CHEMICAL SOC
- Abstract
- A new mechanism for the abiotic production of molecular iodine (I-2) from iodate (IO3-), which is the most abundant iodine species, in dark conditions was identified and investigated. The production of I-2 in aqueous solution containing IO3- and nitrite (NO2-) at 25 degrees C was negligible. However, the redox chemical reaction between IO3- and NO2- rapidly proceeded in frozen solution at -20 degrees C, which resulted in the production of I-2, I-, and NO3-. The rapid redox chemical reaction between IO3- and NO2- in frozen solution is ascribed to the accumulation of IO3-, NO2-, and protons in the liquid regions between ice crystals during freezing (freeze concentration effect). This freeze concentration effect was verified by confocal Raman microscopy for the solute concentration and UV-visible absorption spectroscopy with cresol red (acid-base indicator) for the proton concentration. The freezing-induced production of I-2 in the presence of IO3- and NO2- was observed under various conditions, which suggests this abiotic process for I-2 production is not restricted to a specific region and occurs in many cold regions. NO2--induced activation of IO3- to I-2 in frozen solution may help explain why the measured values of iodine are larger than the modeled values in some polar areas.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/100159
- DOI
- 10.1021/acs.est.8b06638
- ISSN
- 0013-936X
- Article Type
- Article
- Citation
- ENVIRONMENTAL SCIENCE & TECHNOLOGY, vol. 53, no. 9, page. 4892 - 4900, 2019-05
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