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Microbial mediated neoformation of iron- and manganese nanoparticular geosorbents: A spectro-
microscopic in vivo study



Institute of Earth Sciences
Wöllnitzer Str. 7
07749 Jena
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Telephone: +49 (0)3641/948749
Fax: +49 (0)3641/949262

Matthias Händel

Iron and manganese oxides and hydroxides are among the most reactive geosorbents in natural porous media such as soils, the vadose zone and aquifers. They are formed biotically as well as abiotically and affect processes such as adsorption, mobilization, transport and transformation of dissolved organic and inorganic species. This project focuses on the characterization of natural and synthetic (hydrous) iron and manganese oxides and the pathways of their formation with special consideration of organic crystallization inhibitors.

To determine mineralogical properties and molecular structures of the formed phases, it is necessary to apply a variety of analytical methods. Especially spectroscopic and spectro-microscopic techniques such as Fourier transform infrared spectroscopy (FTIR), fluorescence microscopy, electron microprobe analysis (EMPA), transmission electron microscopy (TEM) and atomic force microscopy (AFM) will be applied in a joint fashion to X-ray diffraction (XRD). The studies on naturally formed minerals will be carried out with samples from redoximorphic soils and geological deposits. Abiotically formed minerals and microbially mediated precipitates will serve as synthetically generated reference samples.

mhk1 mhk2
Natural iron minerals precipitated on glacial
Natural manganese minerals precipitated on glacial

Home PhD projects Händel, Matthias: Microbial mediated neoformation of iron- and manganese nanoparticular geosorbents