Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 53, Issue 9, Pages 4892-4900Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.8b06638
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Funding
- Korea Polar Research Institute (KOPRI) project [PE18200]
- Hallym University Research Fund [HRF-201802-012]
- Korea Polar Research Institute of Marine Research Placement (KOPRI) [PE18200] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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