Objective
The aim of the joint research programme is to determine the significance of groundwater colloids in far field radionuclide migration. The characterization, quantification and theoretical interpretation of colloid-borne transport phenomena of radionuclides in selected Gorleben aquifer systems are the main objectives of the present research programme. Gorleben aquifer systems are chosen because they are well characterized in terms of their hydrological and geological properties and because they contain substantial amounts of colloids of different chemical compositions as well as considerable quantities of chemical homologues and natural analogues of radionuclides, e.g. M(III), M(IV), M(VI), and Th and U decay series.
The aim of the research programme is to determine the signifance of groundwater colloids in far field radionuclide migration. The characterization, quantification and theoretical interpretation of colloid borne transport phenomena of radionuclides in selected Gorleben aquifer systems are the main objectives of the present research programme. Gorleben aquifer systems are chosen because they are well characterized for their hydrological and geological properties and because they contain substantial amount of colloids of different chemical compositions as well as considerable quantities of chemical homologues and natural analogues of radionuclides.
The sorption of actinide ions with high electric charges (greater than or equal to +3) onto groundwater colloids can be considered as generation of pseudocolloids of actinides, which play an important role for the subsequent migration processes of the actinides in the geosphere. For the present study, groundwater samples and sediments have been collected from 4 boreholes of Gorleben aquifer systems, which are geologically and chemically different. The sampled groundwaters were submitted to parallel ultrafiltration using filters of different pore sizes to estimate the size and quantity of natural colloids. The groundwater, ultrafiltrates and sediments are characterized for their chemical composition and physical properties. Trace elements of higher oxidation state (greater than or equal to +3) in groundwaters are found to be strongly sorbed on humic colloids. Column experiments for the transport process study are bein prepared. Preliminary tests on hydraulic properties, breakthrough characteristics and scaling factors of the sediment columns are in progress.
Work programme:
B.1 Sampling of groundwaters, colloids and sediments under well controlled conditions.
B.2 Characterization of colloids, groundwaters and sediments.
B.3 Generation of pseudo-colloids of radionuclides (Z{3} 3+): Am(Eu) for M(III), Pu(Th) for M(IV), Np for M(V), U for M(VI).
B.4 Transport process study by scaled column experiments.
B.5 Synthesis and theoretical interpretation.
B.6 Liaison with related studies within the MIRAGE programme (e.g. calculation tool)
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences chemical sciences electrochemistry electrolysis
- natural sciences physical sciences condensed matter physics soft matter physics
- natural sciences chemical sciences nuclear chemistry radiation chemistry
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Coordinator
85748 Garching
Germany
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