Mössbauer study of iron minerals transformations by Fuchsiella ferrireducensстатья

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Дата последнего поиска статьи во внешних источниках: 27 марта 2018 г.

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[1] Mössbauer study of iron minerals transformations by fuchsiella ferrireducens / M. A. Gracheva, N. I. Chistyakova, A. V. Antonova et al. // Hyperfine Interactions. — 2017. — Vol. 238, no. 1. — P. 1–8. Biogenic transformations of iron-containing minerals synthesized ferrihydrite, magnetite and hydrothermal siderite by anaerobic alkaliphilic bacterium Fuchsiella ferrireducens (strain Z-7101T) were studied by 57Fe Mössbauer spectroscopy. Mössbauer investigations of solid phase samples obtained after microbial transformation were carried out at room temperature and at 82 K. It was found that all tested minerals transformed during bacterial growth. In the presence of synthesized ferrihydrite, added as an electron acceptor, a mixture of large (more than 100 nm) and small (∼5 nm) particles of magnetically ordered phase and siderite was formed. Synthesized magnetite that contains both Fe3+ and Fe2+ forms could serve as electron acceptor as well as an electron donor for F.ferrireducens growth. As a result of its biotransformation, no siderite formation was observed while small particles of magnetite were formed. In the case of the addition of siderite as an electron donor formation of a small amount of a new phase containing Fe2+ caused by recrystallization of siderite during bacterial growth was detected. [ DOI ]

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