ArticleFrontiers in microbiology2022
Growth and Persistence of an Aerobic Microbial Community in Wyoming Bentonite MX-80 Despite Anoxic
Article in Frontiers in microbiology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
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Who cites it
12 citing papers in PubMed, 33 citations in OpenAlex.
- Microbial Contamination, Degradation Characteristics of Dominant Bacteria on the Hull of the Nanhai No. 1 Shipwreck.International journal of molecular sciences · 2026Article
- Low bentonite biomass leads to inconsistent culture-based estimates of microbial abundances.FEMS microbiology letters · 2026Article
- Impact of Oxygen Release from Bentonite on Microbial Activity, Mineralogy, and Steel Corrosion.Environmental science & technology · 2025Article
- Effect of temperature on microbial communities in bentonite for use in engineered barrier systems.mSphere · 2025Article
- Seasonal dynamics of microbial diversity and functional potential in active sanitary landfill baseliner microbiomes.Biodegradation · 2025Article
- Minimal changes in microbial abundances and diversity over 7 years of emplacement for modules of compacted bentonite exposed to natural groundwater.Applied and environmental microbiology · 2025Article
- Anthropogenic impacts on the terrestrial subsurface biosphere.Nature reviews. Microbiology · 2025Review
- Comparing the effectiveness of different DNA extraction methods in MX-80 bentonite.Environmental microbiology reports · 2024Article
- Dramatic loss of microbial viability in bentonite exposed to heat and gamma radiation: implications for deep geological repository.World journal of microbiology & biotechnology · 2024Article
- Insights into the Impact of Physicochemical and Microbiological Parameters on the Safety Performance of Deep Geological Repositories.Microorganisms · 2024Review
- Stable microbial community in compacted bentonite after 5 years of exposure to natural granitic groundwater.mSphere · 2023Article
- Impact of microbial processes on the safety of deep geological repositories for radioactive waste.Frontiers in microbiology · 2023Review
Corrections and comments
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Authors and funding
8 authors at 4 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Microbial activity has the potential to enhance the corrosion of high-level radioactive waste disposal canisters, which, in the proposed Swiss deep geological repository, will be embedded in bentonite and placed in the Opalinus Clay (OPA) rock formation. A total of 12 stainless steel cylindrical vessels (referred to as modules) containing bentonite were deployed in an anoxic borehole in OPA for up to 5.5 years. Carbon steel coupons were embedded in the bentonite. Individual modules were retrieved after 1, 1.5, 2.5, and 5.5 years. Enumeration of aerobic and anaerobic heterotrophs and sulfate-reducing bacteria (SRB) revealed microbial growth for 1.5 years followed by a decline or stagnation in microbial viability. It was surprising to observe the growth of aerobic heterotrophs followed by their persistent viability in bentonite, despite the nominally anoxic conditions. In contrast, SRB numbers remained at very low levels. DNA-based amplicon sequencing confirmed the persistence of aerobes and the relatively low contribution of anaerobes to the bentonite microbiome. Bentonite dry density,
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