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Simultaneous and Synergic Production of Bioavailable Iron and Reactive Iodine Species in Ice

Cited 2 time in wos
Cited 3 time in scopus
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Title
Simultaneous and Synergic Production of Bioavailable Iron and Reactive Iodine Species in Ice
Other Titles
얼음화학반응에 의한 철이온 용출 및 활성요오드 생성기작 규명
Authors
Kim, Kitae
Sunil Paul M. Menacherry
김정원
정현영
정다운
Alfonso Saiz-Lopez
최원용
Keywords
abiotic activation of iodide; freeze concentration effect; ice chemistry; production of bioavailable iron
Issue Date
2019
Citation
Kim, Kitae, et al. 2019. "Simultaneous and Synergic Production of Bioavailable Iron and Reactive Iodine Species in Ice". ENVIRONMENTAL SCIENCE & TECHNOLOGY, 53(13): 7355-7362.
Abstract
The bioavailable iron is essential for all living organisms and the dissolution of iron oxide contained in dust and soil is one of the major sources of bioavailable iron in nature. Iodine in the polar atmosphere is related to ozone depletion, mercury oxidation, and cloud condensation nuclei formation. Here we show that the chemical reaction between iron oxides and iodide (I-) is markedly accelerated to produce bioavailable iron (Fe(II)aq) and tri-iodide (I3-: evaporable in the form of I2) in frozen solution (both with and without light irradiation) while it is negligible in aqueous phase. The freeze-enhanced production of Fe(II)aq and tri-iodide is ascribed to the freeze concentration of iron oxides, iodides, and protons in the ice grain boundaries. The outdoor experiments carried out in mid-latitude during a winter day (Pohang, Korea: 36°00′N, 129°19′E) and in an Antarctic environment (King George Island: 62°13′S 58°47′W) also showed the enhanced generation of Fe(II)aq and tri-iodide in ice. This study proposes a previously unknown abiotic mechanism and source of bioavailable iron and active iodine species in the polar environment. The pulse input of bio-available iron and reactive iodine when ice melts may influence the oceanic primary production and CCN formation.
URI
http://repository.kopri.re.kr/handle/201206/10018
DOI
http://dx.doi.org/10.1021/acs.est.8b06659
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