Smart-Kd in der Langzeitsicherheitsanalyse - Anwendungen (SMILE)
- Helmholtz-Zentrum Dresden - Rossendorf e.V. (HZDR) (coordinator),
- Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH,
- Karlsruhe Institute of Technology (KIT)
- V. Brendler (project leader),
- J. Bezzina,
- H. Brinkmann,
- J. Neumann,
- M. Schmidt,
- M. Stockmann
Short Project Description:
In 2008, a series of three subsequent research projects was initiated with the aim to develop a concept to describe sorption of radionuclides in transport models for performance assessment codes of deep geological repositories for nuclear waste as a transient process. This is necessary since environmental conditions are changing with time and space. Consequently, geochemical parameters for long-term safety relevant elements vary temporally and/or spatially. This can lead to significant changes in the sorption behavior of radionuclides. Originally developed in ESTRAL, the concept was then extended to more complex geochemical conditions in the following project WEIMAR and is now being further improved and tested in the most recent joint research project SMILE.
The sorption of relevant metal cations in their reduced tri- or tetravalent form onto natural and synthetic minerals will be investigated to fill gaps in thermodynamic databases. Besides batch sorption and titration experiments, advanced spectroscopic techniques, e.g. time-resolved laser-induced fluorescence spectroscopy (TRLFS), surface x-ray diffraction (crystal truncation rod/resonant anomalous x-ray reflectivityCTR/RAXR), attenuated total reflection Fourier-transform infrared spectroscopy (ATR FTIR) and UV-Vis, will be used to generate a process understanding on the molecular level. This is the prerequisite to deduce reliable surface complexation models and parameters, which in turn allow the calculation of smart Kd-matrices. Based on the comprehensive and updated database, large-scale calculations will be performed to predict the propagation of radioactive contaminants for two different sites in Germany.
A comprehensive study of the sorption mechanism and thermodynamics of f-element sorption onto K-feldspar
Journal of Colloid and Interface Science 591(2021), 490-499
Online First (2020) DOI: 10.1016/j.jcis.2020.11.041
Conference contributions (Oral presentations and posters):
Sorption of trivalent actinides (Cm, Am) and their rare earth analogues (Lu, Y, Eu, Nd, La) onto orthoclase: Batch experiments, Time-Resolved Laser Fluorescence Spectroscopy (TRLFS) and Surface Complexation Modeling (SCM)
EGU General Assembly 2020, 04.-08.05.2020, Wien, Österreich
Smart Kd-concept as efficient approach to improve geochemistry in reactive transport modelling
Stockmann, M.; Noseck, U.; Britz, S.; Flügge, J.; Becker, D.-A.; Brendler, V.
International Workshop on "How to integrate geochemistry at affordable costs into reactive transport for large-scale systems", 05.-07.02.2020, Dresden, Germany
Effect of background electrolyte composition on the formation of Th(IV) nanoparticles on mica (001)
GDCh Fachgruppentagung Nuklearchemie, 25.-27.09.2019, Dresden, Deutschland
Effect of Background Electrolyte Composition on the Interfacial Formation of Th(IV) Nanoparticles
Neumann, J.; Qiu, C.; Hellebrandt, S.; Eng, P.; Skanthakumar, S.; Steppert, M.; Soderholm, L.; Stumpf, T.; Schmidt, M.
Goldschmidt Konferenz 2019, 18.-23.08.2019, Barcelona, Spanien
Smart Kd-concept for a realistic description of sorption processes in repository safety assessment
Stockmann, M.; Becker, D.-A.; Noseck, U.; Brendler, V.
GDCh-Jahrestagung der Fachgruppe Nuklearchemie 2019, 25.-27.09.2019, Dresden, Germany