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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

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 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.

Original languageEnglish
Pages (from-to)1303-1308
Number of pages6
JournalAnalytical Sciences
Volume34
Issue number11
DOIs
Publication statusPublished - 2018
Externally publishedYes

Keywords

  • 7-disulfonate
  • Anthraquinone-2
  • Barren ground
  • Exiguobacterium oxidotolerans sp.
  • Hematite
  • Iron elution
  • Iron reduction
  • Seawater

ASJC Scopus subject areas

  • Analytical Chemistry

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