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Slovak Academy of Sciences, Institute of Inorganic Chemistry, Bratislava, Slovak Republic
Academy of Sciences of the Czech Republic, Czech Republic
Bundesanstalt fuer Materialforschung und -Prifung, Federal Republic of Germany
Four samples of <2 mu m fractions of Fe-rich bentonites from the area of the Zvolenska kotlina Basin (Slovakia) have been investigated by Mossbauer 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 Zvolenska 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.
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  P. KOMADEL, A. S. ANASTACIO, S. ANDREJKOVICOVA, and J. W. STUCKI Iron phases identified in bentonite from the Lieskovec deposit (Slovakia) by variable-temperature Mossbauer spectroscopy Clay Minerals, March 1, 2008; 43(1): 107 - 115. [Abstract] [Full Text] [PDF]
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