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Freeze-Thaw Cycle-Enhanced Transformation of Iodide to Organoiodine Compounds in the Presence of Natural Organic Matter and Fe(III)

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Title
Freeze-Thaw Cycle-Enhanced Transformation of Iodide to Organoiodine Compounds in the Presence of Natural Organic Matter and Fe(III)
Other Titles
동결-해동 사이클에 의한 유기요오드 생성기작 규명
Authors
Du, Juanshan
Kim, Kitae
Min, Dae Wi
Choi, Wonyong
Subject
EngineeringEnvironmental Sciences & Ecology
Keywords
iodinationreactions in icefreeze-concentration effecthumic substancesreactive iodine formation
Issue Date
2022-01-18
Citation
Du, Juanshan, et al. 2022. "Freeze-Thaw Cycle-Enhanced Transformation of Iodide to Organoiodine Compounds in the Presence of Natural Organic Matter and Fe(III)". ENVIRONMENTAL SCIENCE & TECHNOLOGY, 56(2): 1007-1016.
Abstract
The formation of organoiodine compounds (OICs) is of great interest in the natural iodine cycle as well as water treatment processes. Herein, we report a pathway of OIC formation that reactive iodine (RI) and OICs are produced from iodide oxidation in the presence of Fe(III) and natural organic matter (NOM) in frozen solution, whereas their production is insignificant in aqueous solution. Moreover, thawing the frozen solution induces the further production of OICs. A total of 352 OICs are detected by Fourier transform ion cyclotron resonance mass spectrometry in the freeze-thaw cycled reactions of Fe(III)/I-/humic acid solution, which are five times as many as OICs in aqueous reactions. Using model organic compounds instead of NOM, aromatic compounds (e.g., phenol, aniline, o-cresol, and guaiacol) induce higher OIC formation yields (10.4-18.6%) in the freeze-thaw Fe(III)/I-system than those in aqueous (1.1-2.1%) or frozen (2.7-7.6%) solutions. In the frozen solution, the formation of RI is enhanced, but its further reaction with NOM is hindered. Therefore, the freeze-thaw cycle in which RI is formed in the frozen media and the resulting RI is consumed by reaction with NOM in the subsequently thawed solution is more efficient in producing OICs than the continuous reaction in frozen solution.
URI
https://repository.kopri.re.kr/handle/201206/13823
DOI
http://dx.doi.org/10.1021/acs.est.1c06747
Type
Article
Station
기타()
Indexed
SCIE
Appears in Collections  
2021-2021, Investigation of ice microstructure properties for developing low-temperature purification and environment/energy materials (21-21) / Kim, Kitae (PE21120)
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