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Tytuł:
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Cr(VI) Formation via Oxyhalide-Induced Oxidative Dissolution of Chromium Oxide/Hydroxide in Aqueous and Frozen Solution.
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Autorzy:
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Min DW; Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.
Kim K; Korea Polar Research Institute (KOPRI), Incheon 21990, Korea.
Kim B; Korea Polar Research Institute (KOPRI), Incheon 21990, Korea.
Lee G; Department of Earth System Sciences, Yonsei University, Seoul 03722, Korea.; Future City Open Innovation Center, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.
Choi W; Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.; Institute for Convergence Research and Education in Advanced Technology, Yonsei University, Seoul 03722, Korea.
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Źródło:
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Environmental science & technology [Environ Sci Technol] 2020 Nov 17; Vol. 54 (22), pp. 14413-14421. Date of Electronic Publication: 2020 Nov 03.
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Typ publikacji:
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Journal Article; Research Support, Non-U.S. Gov't
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Język:
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English
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Imprint Name(s):
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Publication: Washington DC : American Chemical Society
Original Publication: Easton, Pa. : American Chemical Society, c1967-
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MeSH Terms:
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Chromium*
Hydroxides*
Chromium Compounds ; Oxidation-Reduction ; Oxidative Stress ; Solubility
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Substance Nomenclature:
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0 (Chromium Compounds)
0 (Hydroxides)
0R0008Q3JB (Chromium)
18540-29-9 (chromium hexavalent ion)
7BHJ7466GL (chromium dioxide)
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Entry Date(s):
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Date Created: 20201103 Date Completed: 20210204 Latest Revision: 20210204
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Update Code:
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20240105
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DOI:
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10.1021/acs.est.0c04851
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PMID:
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33140955
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The oxidative dissolution of Cr(III) species (Cr 2 O 3 and Cr(OH) 3 ) by oxyhalide species, which produces hexavalent chromium (Cr(VI)), was studied in aqueous and frozen solution. The oxyhalide-induced oxidation of Cr(III) in frozen solution showed a different trend from that in aqueous solution. Cr(VI) production was higher in frozen than aqueous solution with hypochlorous acid (HOCl) and bromate (BrO 3 - ) but suppressed in frozen solution with hypobromous acid (HOBr) and periodate (IO 4 - ). In particular, bromate markedly enhanced Cr(VI) production in frozen solution, whereas it had a negligible activity in aqueous solution. On the contrary, periodate produced Cr(VI) significantly in aqueous solution but greatly suppressed it in frozen solution. Bromate was found to be much more concentrated in the ice grain boundary than periodate according to both chemical and Raman spectral analyses. The oxidative transformation of Cr(III) to Cr(VI) was accompanied by the concurrent and stoichiometric reduction of oxyhalide species. Dissolved O 2 had little effect on the oxidative dissolution, but dissolved organic matter retarded the oxidation of Cr 2 O 3 in both aqueous and frozen conditions. This study proposes that the oxyhalide-induced oxidation of Cr(III) (particularly by bromate) in frozen conditions might have a significant effect on the generation of Cr(VI) in the frozen environment.
