Redox mineral transformation by microorganisms is of scientific attention nowadays. Studying such processes is important to understand the formation of the Precambrian sedimentary deposits. Moreover, mineral biotransformation products are used in various applications, particularly in biomedicine and pollution disposal technology. The goal of this study was to investigate the biotransformation of magnetite and ferrihydrite using Mossbauer spectroscopy. The new model was suggested to treat Mössbauer spectra that allowed for estimating the magnetite/maghemite ratio in the mixture and particle size. It was found that the mineral biotransformation rate strongly depends on the initial concentration of magnetite and on the bacterial growth time. The formation of new phases during the biotransformation of magnetite and ferrihydrite was detected.

Biotransformation of magnetite and ferrihydrite studied by Mössbauer spectroscopy

ACS Fall 2021

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