Sorption of 14C, 99Tc, 137Cs, 90Sr, 63Ni, and 241Am onto a rock and a fracture-filling material from the Wolsong low- and intermediate-level radioactive waste repository, Gyeongju, Korea

Baik, Min Hoon; Kim, S. S.; Lee, J. K.; Lee, S. Y.; Kim, G. Y.; Yun, Seong Taek

doi:10.1007/s10967-009-0369-z

Cited by 15 publications

(1 citation statement)

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“…The interactions between subsurface bacteria and some clays such as smectite are relatively well characterized. However, despite their abundance in many near-surface environments and their potential importance in contaminant retardation (Baik et al 2010;McKinley et al 2001), the microbial reduction of biotite and chlorite has not been as well studied as for other phyllosilicates. (Eggleton and Banfield 1985) and is found in altered basic and intermediate igneous rocks, in low-grade metamorphic rocks and as a detrital or diagenetic component in a range of soils and sediments.…”

Section: Introductionmentioning

confidence: 99%

Bioreduction of biotite and chlorite by a Shewanella species

Brookshaw

Lloyd

Vaughan

et al. 2014

American Mineralogist

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The interactions between the Fe(III)-reducing bacterium Shewanella oneidensis MR-1 and the phyllosilicate minerals biotite and chlorite have been studied. In washed, non-growing cell suspensions, S. oneidensis MR-1 was able to mediate the reduction of Fe(III) in biotite and chlorite in the presence and absence of an artificial electron shuttle, and to reduce as much as 36% of the starting Fe(III) in biotite, and 21% in chlorite. This is predominantly a solid-state reaction, as no significant dissolution or change in morphology was observed after microbial reduction. In growing-cell experiments, with Fe(III) as the only electron acceptor, bacterial biomass increased over eight weeks of incubation. Combining the results of (weak acid-extractable) iron characterization by ferrozine assay and bulk solid iron mineral characterization using Mössbauer spectroscopy, has led to the development of a possible mechanism of reduction of Fe(III) in the bulk of the mineral. Long-distance electron transfer between M2 sites along octahedral layers may facilitate the reduction of the bulk mineral. To our knowledge, this is the first study to demonstrate microbially mediated reduction of Fe(III) within biotite, and show the ability of S. oneidensis MR-1 to conserve energy for growth from this reduction.

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Section: Introductionmentioning

confidence: 99%