Mechanism of microbial dissolution and oxidation of antimony in stibnite under ambient conditions

[Display omitted] •A bacterial strain Paraccocus versutus XT0.6 was isolated from the Xikuangshan antimony mine.•XT0.6 can oxidize dissolved Sb(III) aerobically and anaerobically.•Sb(III) in minerals/rocks can be dissolved by XT0.6 via increasing pH and completely oxidized to Sb(V).•The formation of...

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Published in:Journal of hazardous materials 2020-03, Vol.385, p.121561-121561, Article 121561
Main Authors: Loni, Prakash C., Wu, Mengxiaojun, Wang, Weiqi, Wang, Hongmei, Ma, Liyuan, Liu, Chaoyang, Song, Yuyang, H Tuovinen, Olli
Format: Article
Language:English
Subjects:
Antimony - chemistry
Antimony - metabolism
Antimony dissolution and oxidation
Antimony sulfide bearing ores
Hydrogen-Ion Concentration
Kinetics
Minerals - chemistry
Minerals - metabolism
Mining
Oxidation-Reduction
Paraccocus versutus XT0.6
Rhodobacteraceae - isolation & purification
Rhodobacteraceae - metabolism
Solubility
Xikuangshan
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Summary:[Display omitted] •A bacterial strain Paraccocus versutus XT0.6 was isolated from the Xikuangshan antimony mine.•XT0.6 can oxidize dissolved Sb(III) aerobically and anaerobically.•Sb(III) in minerals/rocks can be dissolved by XT0.6 via increasing pH and completely oxidized to Sb(V).•The formation of secondary mineral mopungite [NaSb(OH)6] sequester part of Sb(V).•Complete oxidation of Sb(III) and secondary mineral were not observed in abiotic controls. In this study, we demonstrate that a bacterial isolate Paraccocus versutus XT0.6 from the Xikuangshan antimony mine, the world largest antimony deposit, is capable of stibnite dissolution, oxidation of Sb(III), and formation of secondary Sb(V) bearing mineral. The isolate could oxidize dissolved Sb(III) aerobically and anaerobically. It was able to dissolve Sb(III) in solid minerals, which was subsequently oxidized to Sb(V) completely. Part of Sb(V) was scavenged by the formation of secondary Sb(V)-bearing mineral mopungite [NaSb(OH)6] in the biotic experiments. In contrast, Sb(III) released from mineral/rocks was only partially oxidized to Sb(V) and no secondary Sb-bearing mineral was formed in abiotic controls. These results demonstrated that microbial processes involved in the mobilization, oxidation, and transformation of antimony in minerals/rocks under ambient environmental conditions and offer new insights in biogeochemistry of Sb at mining areas.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2019.121561