Anaerobic microbial corrosion of carbon steel under conditions relevant for deep geological repository of nuclear waste
Jazyk angličtina Země Nizozemsko Médium print-electronic
Typ dokumentu časopisecké články
PubMed
34392220
DOI
10.1016/j.scitotenv.2021.149539
PII: S0048-9697(21)04613-1
Knihovny.cz E-zdroje
- Klíčová slova
- Carbon steel, Methyloversatilis, Microbiological corrosion, Nitrate-reducing bacteria, Nitrates, Nuclear waste repository,
- MeSH
- anaerobióza MeSH
- koroze MeSH
- ocel * MeSH
- radioaktivní odpad * MeSH
- uhlík MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- ocel * MeSH
- radioaktivní odpad * MeSH
- uhlík MeSH
We examined microbial corrosion of carbon steel in synthetic bentonite pore water inoculated with natural underground water containing microorganisms over a period of 780-days under sterile and anaerobic conditions. Corrosion behaviour was determined using the mass loss method, SEM-EDS analysis and Raman spectroscopy, while qualitative and quantitative changes in the microbial community were analysed using molecular-biological tools (16S rDNA amplicon sequencing and qPCR analysis, respectively). Corrosion rates were significantly higher in the biotic environment (compared with an abiotic environment), with significant localisation of corrosion attacks of up to 1 mm arising within 12-months. Nitrate reducing bacteria, such as Pseudomonas, Brevundimonas and Methyloversatilis, dominated the microbial consortium, the high abundance of Methyloversatilis correlating with periods of highest localised corrosion penetrations, suggesting that this bacterium plays an important role in microbially influenced corrosion. Our results indicate that nitrate-reducing bacteria could represent a potential threat to waste canisters under nuclear repository conditions.
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