One of them is focusing on the examination of host rocks possible for HLW deposition in Hungary, while the other is highlighting measurements on calcium phosphate-based material used in the reductive adsorption of Cr(VI) to Cr(III) for water remediation.
Boda Claystone is considered to be a perspective host rock for deposition of high level nuclear wastes produced in the Paks Nuclear Plant. The rock is a sedimentary formation with dominance of secondary clay minerals (e.g. illite, chlorite), which sheet silicates contain ferric and ferrous iron in significant amounts. The distribution of iron among ferric and ferrous sites was followed principally with 57Fe Mössbauer spectroscopy on samples obtained from different depths of various boreholes and correlations with various stages of evolution of minerals in different locations were deduced.
Lázár, K.; Máthé, Z.; Németh, T.; Kovács-Kis, V.; Stichleutner, S.; Kovács, I. Iron-Bearing Minerals in the Boda Claystone Formation: Correspondences with Stages of Evolution Revealed by Mössbauer Spectroscopy. Minerals 2024, 14, 196.
https://doi.org/10.3390/min14020196
Tin doped Ca phosphate was prepared and used for removal of toxic Cr(VI) from waste water. Presence of amorphous and crystalline phases was revealed, crystalline components were identified by X-ray diffraction. The Cr(VI) => Cr(III) reduction is closely connected with simultaneous Sn(II) => Sn(IV) oxidation process. 119Sn Mössbauer spectroscopy was successfully applied to determine the extent of the Sn(II) to Sn(IV) conversion both in the amorphous and crystalline phases.
