Studies on hydro-geochemical controls of neptunium and selenium migration in granite columns
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.
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
Original language: en
Available languages: en