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Demnitz M, Molodtsov K, Schymura S, et al. Effects of surface roughness and mineralogy on the sorption of Cm(III) on crystalline rock. J Hazard Mater. 2021;423:127006doi: 10.1016/j.jhazmat.2021.127006.
Demnitz, M., Molodtsov, K., Schymura, S., Schierz, A., Müller, K., Jankovsky, F., Havlova, V., Stumpf, T., & Schmidt, M. (2022). Effects of surface roughness and mineralogy on the sorption of Cm(III) on crystalline rock. Journal of hazardous materials, 423127006. https://doi.org/10.1016/j.jhazmat.2021.127006
Demnitz, M, et al. "Effects of surface roughness and mineralogy on the sorption of Cm(III) on crystalline rock." Journal of hazardous materials vol. 423 (2022): 127006. doi: https://doi.org/10.1016/j.jhazmat.2021.127006
Demnitz M, Molodtsov K, Schymura S, Schierz A, Müller K, Jankovsky F, Havlova V, Stumpf T, Schmidt M. Effects of surface roughness and mineralogy on the sorption of Cm(III) on crystalline rock. J Hazard Mater. 2022 Feb 05;423:127006. doi: 10.1016/j.jhazmat.2021.127006. Epub 2021 Aug 21. PMID: 34481396.
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J Hazard Mater. 2022 Feb 05;423:127006. doi: 10.1016/j.jhazmat.2021.127006. Epub 2021 Aug 21.

Effects of surface roughness and mineralogy on the sorption of Cm(III) on crystalline rock.

Journal of hazardous materials

M Demnitz, K Molodtsov, S Schymura, A Schierz, K Müller, F Jankovsky, V Havlova, T Stumpf, M Schmidt

Affiliations

  1. Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany.
  2. Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Resource Ecology, Research Site Leipzig, Permoserstr. 15, 04318 Leipzig, Germany.
  3. ÚJV Rez, a.s., Hlavni 130, Rez, 250 68 Husinec, Czech Republic.
  4. Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany. Electronic address: [email protected].

PMID: 34481396 DOI: 10.1016/j.jhazmat.2021.127006

Abstract

Crystalline rock is one of the host rocks considered for a future deep geological repository for highly active radiotoxic nuclear waste. The safety assessment requires reliable information on the retention behavior of minor actinides. In this work, we applied various spatially resolved techniques to investigate the sorption of Curium onto crystalline rock (granite, gneiss) thin sections from Eibenstock, Germany and Bukov, Czech Republic. We combined Raman-microscopy, calibrated autoradiography and µTRLFS (micro-focus time-resolved fluorescence spectroscopy) with vertical scanning interferometry to study in situ the impact of mineralogy and surface roughness on Cm(III) uptake and molecular speciation on the surface. Heterogeneous sorption of Cm(III) on the surface depends primarily on the mineralogy. However, for the same mineral class sorption uptake and strength of Cm(III) increases with growing surface roughness around surface holes or grain boundaries. When competitive sorption between multiple mineral phases occurs, surface roughness becomes the major retention parameter on low sorption uptake minerals. In high surface roughness areas primarily Cm(III) inner-sphere sorption complexation and surface incorporation are prominent and in selected sites formation of stable Cm(III) ternary complexes is observed. Our molecular findings confirm that predictive radionuclide modelling should implement surface roughness as a key parameter in simulations.

Copyright © 2021 Elsevier B.V. All rights reserved.

Keywords: Crystalline rock; Curium; Granite; Sorption; µTRLFS

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