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Nitrite as a causal factor for nitrate-dependent anaerobic corrosion of metallic iron induced by Prolixibacter strains
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  • Takao Iino,
  • Nobuaki Shono,
  • Kimio Ito,
  • Ryuhei Nakamura,
  • Kazuo Sueoka,
  • Shigeaki Harayama,
  • Moriya Ohkuma
Takao Iino
RIKEN
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Nobuaki Shono
RIKEN
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Kimio Ito
Nippon Steel and Sumitomo Metal Corp
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Ryuhei Nakamura
RIKEN
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Kazuo Sueoka
Nippon Steel and Sumitomo Metal Corp
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Shigeaki Harayama
Chuo University
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Moriya Ohkuma
RIKEN
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Abstract

Microbially influenced corrosion (MIC) may contribute significantly to overall corrosion risks, especially in the gas and petroleum industries. In this study, we isolated four Prolixibacter strains, which belong to the phylum Bacteroidetes, and examined their nitrate-respiration- and Fe0-corroding activities, together with two previously isolated Prolixibacter strains. Four of the six Prolixibacter strains reduced nitrate under anaerobic conditions, while the other two strains did not. The anaerobic growth of the four nitrate-reducing strains was enhanced by nitrate, which was not observed in the two nitrate-non-reducing strains. When the nitrate-reducing strains were grown anaerobically in the presence of Fe0 or carbon steel, the corrosion of the materials was enhanced by more than 20-fold compared to that in aseptic controls. This enhancement was not observed in cultures of the nitrate-non-reducing strains. The oxidation of Fe0 in the anaerobic cultures of nitrate-reducing strains occurred concomitantly with the reduction of nitrite. Since nitrite chemically oxidized Fe0 under anaerobic and aseptic conditions, the corrosion of Fe0- and carbon-steel by the nitrate-reducing Prolixibacter strains was deduced to be mainly enhanced via the biological reduction of nitrate to nitrite, followed by the chemical oxidation of Fe0 to Fe2+ and Fe3+ coupled to the reduction of nitrite.

Peer review status:ACCEPTED

24 May 2021Submitted to MicrobiologyOpen
25 May 2021Submission Checks Completed
25 May 2021Assigned to Editor
04 Jun 2021Reviewer(s) Assigned
20 Jun 2021Review(s) Completed, Editorial Evaluation Pending
21 Jun 2021Editorial Decision: Revise Major
07 Jul 20211st Revision Received
07 Jul 2021Submission Checks Completed
07 Jul 2021Assigned to Editor
07 Jul 2021Review(s) Completed, Editorial Evaluation Pending
07 Jul 2021Editorial Decision: Revise Minor
09 Jul 20212nd Revision Received
10 Jul 2021Submission Checks Completed
10 Jul 2021Assigned to Editor
10 Jul 2021Review(s) Completed, Editorial Evaluation Pending
16 Jul 2021Editorial Decision: Accept