NDLI: Quantification of Secondary Fe-Phases Formed During Sorption Experiments on Chlorites

Content Provider	Springer Nature Link
Author	Reuther, H. Arld, T. Krawczyk Bärsch, E.
Copyright Year	2004
Abstract	During batch sorption experiments of heavy metals on chlorite not only sorption reactions take place, but also reactions of chemical weathering leading to mineral dissolution and the formation of secondary phases, in particular the Fe-oxy-hydroxide ferrihydrite. Despite of its minor mass but because of its large specific surface area, ferrihydrite plays a major role in removing aqueous uranium(VI) from solution. To accurately model the sorption and transport on or through geological materials it is necessary to precisely determine the mass of the newly-formed Fe-phase. As the relative mass of the ferrihydrite within the geological matrix was too small, it was impossible to use powder X-ray diffraction or some other spectroscopic techniques, e.g., Raman spectroscopy, for its identification and quantification.Because of the ability to discriminate different sites and oxidation states of iron, Mössbauer spectroscopy at room temperature was used. At first spectra of pure chlorite and pure ferrihydrite were measured. In a second step, simulated spectra were compared with spectra from powders with known chlorite/ferrihydrite ratios. There was a good agreement between the predicted values and those obtained by the spectrum fit. Finally, the calibration spectra were used to investigate real geological material and to estimate the fraction of the secondary Fe-phase, which has been formed during the sorption experiments. Changes of less than 2% (absolute) could be detected. It should be noted that there is a strong overlap between the different subspectra and that a good counting statistics is required.
Starting Page	439
Ending Page	443
Page Count	5
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	156
Issue Number	1-4
e-ISSN	15729540
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Nuclear Physics, Heavy Ions, Hadrons Atoms, Molecules, Clusters and Plasmas Condensed Matter Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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