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Roles of Microbial Activity and Anthraquinone-2,7-disulfonate as a Model of Humic Substances in Leaching of Iron from Hematite into Seawater

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Title: Roles of Microbial Activity and Anthraquinone-2,7-disulfonate as a Model of Humic Substances in Leaching of Iron from Hematite into Seawater
Authors: Aneksampant, Apichaya Browse this author
Tanaka, Atsushi Browse this author
Tu, Xuefei Browse this author
Iwai, Hisanori Browse this author
Yamamoto, Mitsuo Browse this author
Nakashima, Kazunori Browse this author
Fukushima, Masami Browse this author →KAKEN DB
Keywords: Anthraquinone-2,7-disulfonate
barren ground
Exiguobacterium oxidotolerans sp.
hematite
iron elution
iron reduction
seawater
Issue Date: Nov-2018
Publisher: 日本分析化学会
Journal Title: Analytical sciences
Volume: 34
Issue: 11
Start Page: 1303
End Page: 1308
Publisher DOI: 10.2116/analsci.18P147
PMID: 30078814
Abstract: Fertilization with a mixture of steelmaking slag and compost can affect the supply of dissolved iron used to restore seaweed beds, however, the mechanisms of iron elution from the fertilizer are not well understood. In the present study, the microorganism was isolated from Fe-fertilizer incubated in coastal seawater for 6 months, and was identified as Exiguobacterium oxidotolerans by 16S rDNA sequencing. The iron elutability of the bacteria was proved based on the increasing of dissolved iron by incubation with Fe2O3 (hematite) under a seawater-like condition. The value of ORP was changed by inoculated of the bacteria from ca. 0 to ca. -400 mV, which is anticipated concerning to reduction of Fe. The concentration of eluted iron was largely depended on those of organic acids produced by bacteria. From the results, it was proved that E. oxidotolerans is capable of Fe reductive eluting of iron from Fe2O3 into seawater. Anthraquinone-2,7-disulfonate (AQDS), which can play as an electron acceptor/donor between microbe and insoluble Fe2O3 particles, enhanced the effect of iron bio-leaching.
Type: article
URI: http://hdl.handle.net/2115/72335
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中島 一紀

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