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http://dx.doi.org/10.9719/EEG.2012.45.2.189

Quantitative Determination of Fe-oxidation State by Electron Energy Loss Spectroscopy (EELS)  

Yang, Ki-Ho (Department of Earth System Sciences, Yonsei University)
Kim, Jin-Wook (Department of Earth System Sciences, Yonsei University)
Publication Information
Economic and Environmental Geology / v.45, no.2, 2012 , pp. 189-194 More about this Journal
Abstract
The consequences of microbe-mineral interaction often resulted in the chemical, structural modification, or both in the biologically induced mineral. It is inevitable to utilize the high powered resolution of electron microscopy to investigate the mechanism of biogenic mineral transformation at nano-scale. The applications of transmission electron microscopy (TEM) capable of electron energy loss spectroscopy (EELS) to the study of microbe-mineral interaction were demonstrated for two examples: 1) biogenic illite formation associated with structural Fe(III) reduction in nontronite by Fereducing bacteria; 2) siderite phase formation induced by microbial Fe(III) reduction in magnetite. In particular, quantification of the changes in Fe-oxidation state at nanoscale is essential to understand the dynamic modification of minerals resulted from microbial Fe reduction. The procedure of EELS acquisition and advantages of EELS techniques were discussed.
Keywords
TEM; EELS; Fe-reduction; Mineral transformation;
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