Abstract
AbstractDistribution of Fe in the fine fractions of four Czech bentonites was investigated by M6ssbauer spectroscopy. The spectra at room and liquid nitrogen temperatures revealed that most Fe present in the samples is structurally bound in smectite. Microcrystalline and/or Al-substituted goethite was identified in all fine fractions, comprising 8 to 50% of total Fe. This mineral was partly magnetically ordered in the Rokle sample even at room temperature. Two per cent of total Fe was bound in hematite in the Krásný Dvoreček sample. Only octahedral Fe(III) was found in the Rokle and Stebno samples, while Krásný Dvoreček and Hroznětín contained 9 and 38%, respectively, of the total Fe as octahedral Fe(II) and 14% of total Fe was found as tetrahedral Fe(III) in Krásný Dvoreček.
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