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Abstract

Studies were carried out on the effect of redox conditions and Humic Substances (H.S.) on the migration of Np and Se through cored and crushed granite columns. A Np pulse through intact cores was found to move faster under anoxic than under oxic conditions, with a 0.2% cumulative recovery. The addition of 5 ppm H.S. produced an even more rapid breakthrough (about 0.55% recovery), almost indistinguishable from the tritiated water peak. Selenate ions were found to move through granite columns without retardation but with incomplete recovery. This was interpreted as a surface mediated redox transformation during the interaction with fracture filling materials. The stronger affinity of selenite ions for granite was confirmed.

Additional information

Authors: GUTIERREZ M G, CIEMAT, Madrid (ES);YLLERA DE LLANO A, CIEMAT, Madrid (ES);BIDOGLIO G, JRC Ispra (IT);AVOGADRO A, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, Jerez de la Frontera (ES), Oct. 21-25, 1991
Availability: Available from (1) as Paper EN 36261 ORA
Record Number: 199210067 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en