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Pyrite Surface Alteration of Synthetic Single Crystals as Effect of Microbial Activity and Crystallographic Orientation
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Pyrite Surface Alteration of Synthetic Single Crystals as Effect of Microbial Activity and Crystallographic Orientation

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Abstract:

To enhance our understanding of effects of microbially mediated pyrite dissolution and the influence parameters such as varied metabolism and crystallographic orientation of pyrite surfaces some dissolution experiments were performed. Microbial etching experiments on pyrite surfaces of different orientation, including {111} and {210} were devised. The experiments were performed using two strains of thermophilic Archaea (Sulfolobus metallicus, Metallosphaera sedula). Epifluorescence microscopy observations showed that the strains attach to the mineral surface. Studies with Scanning Electron Microscopy (SEM) showed cell attachment and etching effects after one week of incubation. Surface alteration produced structures following crystallographic orientation up to several 10 μm in size. For all incubated pyrite samples it became apparent that surface alteration was more pronounced with M. sedula than with S. metallicus.

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Periodical:

Advanced Materials Research (Volumes 20-21)

Pages:

350-353

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.20-21.350

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Online since:

July 2007

Authors:

Katja Etzel, Harald Huber, Reinhard Rachel, Gottfried Schmalz, Michael Thomm, Wulf Depmeier

Keywords:

Crystallographic Orientation, Metallosphaera sedula, Pyrite Oxidation, Sulfolobus Metallicus, Synthetic Pyrite Surfaces

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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