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Reductive dissolution and Mössbauer spectroscopic study of Fe forms in the fine fractions of Slovak Fe-rich bentonites

Published online by Cambridge University Press:  09 July 2018

P. Komadel ,
T. Grygar  and
H. Mehner
P. Komadel
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava, Slovakia
T. Grygar
Affiliation:
Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, CZ-250 68 Řež, Czech Republic
H. Mehner
Affiliation:
Bundesanstalt für Materialforschung und -prüfung, Rudower Chaussee 5, D-12489 Berlin-Adlershof, Germany
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Abstract

Four samples of <2 µm fractions of Fe-rich bentonites from tile area of the Zvolenská kotlina Basin (Slovakia) have been investigated by MiSssbauer spectroscopy and reductive dissolution in ammonium hydrogen oxalate (pH = 2.7). Both methods have shown the presence of goethite in the samples. The relative amount of Fe bound in goethite varied more within the samples of bentonite from Zvolensk~ Slatina, which was redeposited after transport over a short distance, than in the authigenically altered bentonite from Hrochot’. The results of the fits of the reductive dissolution curves suggest size distribution, variation in Al-for-Fe substitution in goethite particles and/or different access of extracting solution to goethite particles present in the analysed fine fractions of bentonites.

Type
Research Article
Information
Clay Minerals , Volume 33 , Issue 4 , December 1998 , pp. 593 - 599
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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