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Abstract

PU ADSORPTION ON PURE GAMMA-ALUMINA AND HETEROGENEOUS MINERAL PHASES WAS INVESTIGATED AS A FUNCTION OF PH AND HUMIC ACID (HA) CONCENTRATION. INFORMATION ON SURFACE SPECIATION WAS OBTAINED BY USING VARIOUS ACTINIDES AS VALENCE ANALOGUES FOR PU. SURFACE REDUCTION OF PU(V) OCCURRED IN THE PRESENCE OF ELECTRON EXCHANGING MINERALS EVEN UNDER OXIDIZING CONDITIONS. ONE-DIMENSIONAL TRANSPORT EXPERIMENT OF HIGH MOLECULAR WEIGHT HA IN WATER SATURATED CLAYEY SAND COLUMNS WAS PERFORMED UNDER REDUCING CONDITIONS (EH-200 MV). THIS SHOWED THAT SMALL HA COLLOIDS WERE ELUTING AHEAD OF LARGER PARTICLES. THE RESULTING HA BREAKTHROUGH CURVE WAS CHARACTERISED BY EXTENDED TAILING. PHYSICO-CHEMICAL INTERACTIONS AT THE MINERAL SURFACE AND PARTICLE STRAINING IN SMALLER PORE SPACES APPEAR TO CONTROL HA TRANSPORT THROUGH THE SOIL. THE CHEMICAL ASSOCIATION OF PU WITH MOVING HA WAS INVESTIGATED BY LEACHING OF 238-PU-DOPED BOROSILICATE GLASSESS. ENHANCEMENT IN PU RELEASE RATE WAS OBSERVED IN HA SOLUTIONS COMPARED WITH ORGANIC-FREE GROUNDWATER.

Additional information

Authors: BIDOGLIO G, JRC-ISPRA;UNIVERSITY OF MILANO, I;DE PLANO A, JRC-ISPRA;UNIVERSITY OF MILANO, I;RIGHETTO L JRC-ISPRA, JRC-ISPRA;UNIVERSITY OF MILANO, I;UNIVERSITY OF MILANO, I, JRC-ISPRA;UNIVERSITY OF MILANO, I
Bibliographic Reference: PAPER PRESENTED: 12TH INTERNATIONAL SYMPOSIUM ON THE SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT, BERLIN/W., OCT. 10-13, 1988, AVAILABILITY: CECLUXEMBOURG, DG XIII/A2, BP 1907, MENTIONING PAPER ORA 34109 E
Availability: Can be ordered online
Record Number: 1989126222400 / Last updated on: 1989-04-01
Category: PUBLICATION
Available languages: en