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Freezing-Enhanced Dissolution of Iron Oxides: Effects of Inorganic Acid Anions

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Title
Freezing-Enhanced Dissolution of Iron Oxides: Effects of Inorganic Acid Anions
Other Titles
얼음내 향상된 산화철 용출반응에 음이온이 미치는 영향 연구
Authors
Kim, Kitae
Choi, Wonyong
Min, Dae Wi
Jeong, Daun
Issue Date
2015
Citation
Kim, Kitae, et al. 2015. "Freezing-Enhanced Dissolution of Iron Oxides: Effects of Inorganic Acid Anions". ENVIRONMENTAL SCIENCE & TECHNOLOGY, 49(21): 12816-12822.
Abstract
Dissolution of iron from mineral dust particles greatly depends upon the type and amount of co-present inorganic anions. In this study, we investigated the roles of sulfate, chloride, nitrate, and perchlorate on the dissolution of maghemite and lepidocrocite in ice under both dark and UV irradiation and compared the results with their aqueous counterparts. After 96 h of reaction, the total dissolved iron in ice (pH 3 before freezing) was higher than that in the aqueous phase (pH 3) by 6?28 times and 10?20 times under dark and UV irradiation, respectively. Sulfuric acid was the most efficient in producing labile iron under dark condition whereas hydrochloric acid induced the most dissolution of the total and ferrous iron in the presence of light. This ice-induced dissolution result was also confirmed with Arizona Test Dust (AZTD). In the freeze-thaw cycling test, the iron oxide samples containing chloride, nitrate, or perchlorate showed a similar extent of total dissolved iron after each cycling while the sulfate-containing sample rapidly lost its dissolution activity with repeating the cycle. This unique phenomenon observed in ice might be related to the freeze-concentration of protons, iron oxides, and inorganic anions in the liquid-like ice grain boundary region. These results suggest that the ice-enhanced dissolution of iron oxides can be a potential source of bioavailable iron and the acid anions critically influence this process.
URI
http://repository.kopri.re.kr/handle/201206/7386
DOI
http://dx.doi.org/10.1021/acs.est.5b04211
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