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This is a final report of the joint research programme to study the significance of groundwater colloids in far field radionuclide migration. The characterization, quantification and theoretical interpretation of colloid-borne transport phenomena for radionuclides were the main objectives. Groundwaters, colloids and sediments sampled from aquifer systems overlying a saltdome were characterized by various analytical methods. Levels of different natural isotopes were determined and their ratios compared in order to ascertain the provenance of the groundwater colloids. The investigated groundwaters contain substantial amounts of colloids mainly composed of humic and fulvic acids loaded with various metal ions. The chemical interaction of radionuclide ions of various oxidation states with groundwater colloids was investigated in order to elucidate the colloid facilitated migration behaviour of actinides. Transport process studies were made with generated pseudocolloids of radionuclides in various oxidation states. A modelling program was developed to predict chemical transport of radionuclides in the presence of humic colloids using a modified version of the CHEMTARD code. Modelling predictions have generated acceptable for Eu, Am and U and poorer agreement between experimental and modelling results for Th and Np as a result of more limited data.

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Authors: KIM J I ET AL, Technische Universität München (DE);IVANOVICH M ET AL, AEA Technology, Harwell Laboratory, Didcot, Oxon (GB);FRITZ P ET AL, Forschungszentrum für Umwelt und Gesundheit GmbH, München (DE);ALEXANDER J L ET AL, W S Atkins Engineering Sciences, London (GB)
Bibliographic Reference: EUR 16754 EN (1996) 316pp., FS, ECU 36.50
Availability: Available from the (2)
ISBN: ISBN 92-827-5919-9
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