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A research project on the potential role of colloids in the transport of radioelements in geological media has been undertaken in order to identify some of the main parameters controlling retention and transport. For the study of pseudocolloid formation, sorption experiments (batch tests) with radionuclides have been conducted either with model inorganic colloidal suspensions (silica) or with mineral monoliths (mainly silicates and oxides) as macroscopic surfaces of colloids. Column experiments have been performed using both synthetic and natural materials as major constituents of granite, such as those found at the El Berrocal site (Spain). Model systems based on field studies carried out at the El Berrocal site provided data for validating transport models (in porous or fractured media) with a particular emphasis on the upscaling. The results obtained in each task are presented in this document under the main following issues concerning: the characterization of colloids related to the El Berrocal site (from natural groundwaters, clayey fissure materials and backfill materials); the formation of pseudocolloids (silica and Am); the retention of colloids and pseudocolloids (silica, haematite, ceria and thoria) onto mineral surfaces (silicates, oxides); the transport behaviour of radioelements (Na, Ca, Eu, Am) and colloids (Ce, silica) in the presence or not of organic coatings (humic acids); the modelling of colloid transport.

Additional information

Authors: DRAN J C, Nuclear Spectrometry and Mass Spectrometry Centre, CNRS, Orsay (FR);PIERI J ET AL, Université de Nantes, Germetrad (FR);DELLA MEA G ET AL, INFM;LANG H, Laboratori Nazionali di Legnaro, Padua (IT);TURRERO M J ET AL, GSF, Institut für Hydrologie, München (DE);GRINDROD P ET AL, CIEMAT, Madrid (ES);BALEK V ET AL, Environmental Division, Division Tecnicas Geologicas, INTERA, Henley-on-Thames (GB);MOULIN V ET AL, CEA, CEN Fontenay-aux-Roses (FR)
Bibliographic Reference: EUR 16880 EN (1996) 376pp., FS, ECU 43.00
Availability: Available from the (2)
ISBN: ISBN 92-827-6901-1
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