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

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Four samples of <2 mum fractions of Fe-rich bentonites from the area of the Zvolenská kotlina Basin (Slovakia) have been investigated by Mössbauer 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 Zvolenská 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.

Document Type: Research Article


Affiliations: 1: Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava, Slovakia 2: Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, CZ-250 68 Rez, Czech Republic 3: Bundesanstalt für Materialforschung und-prüfung, Rudower Chaussee 5, D-12489 Berlin-Adlershof, Germany

Publication date: December 1, 1998

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