Roles of microbial activity and anthraquinone-2,7-disulfonate as a model of humic substances in leaching of iron from hematite into seawater

Apichaya Aneksampant, Atsushi Tanaka, Xuefei Tu, Hisanori Iwai, Mitsuo Yamamoto, Kazunori Nakashima*, Masami Fukushima

*この研究の対応する著者

研究成果: Article査読

7 被引用数 (Scopus)

抄録

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 Fe 2 O 3 (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 Fe 2 O 3 into seawater. Anthraquinone-2,7- disulfonate (AQDS), which can play as an electron acceptor/donor between microbe and insoluble Fe 2 O 3 particles, enhanced the effect of iron bio-leaching.

本文言語English
ページ(範囲)1303-1308
ページ数6
ジャーナルAnalytical Sciences
34
11
DOI
出版ステータスPublished - 2018
外部発表はい

ASJC Scopus subject areas

  • 分析化学

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