Nitrite-Induced Activation of Iodate into Molecular Iodine in Frozen Solution

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00113352" target="_blank" >RIV/00216224:14310/19:00113352 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1021/acs.est.8b06638" target="_blank" >http://dx.doi.org/10.1021/acs.est.8b06638</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.est.8b06638" target="_blank" >10.1021/acs.est.8b06638</a>

Result language

angličtina

Original language name

Nitrite-Induced Activation of Iodate into Molecular Iodine in Frozen Solution

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20800 - Environmental biotechnology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

ENVIRONMENTAL SCIENCE &amp; TECHNOLOGY

ISSN

0013-936X

e-ISSN

—

Volume of the periodical

53

Issue of the periodical within the volume

9

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

4892-4900

UT code for WoS article

000467641800025

EID of the result in the Scopus database

2-s2.0-85064838026