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SIMULATION OF RADIONUCLIDE EXCHANGE BETWEEN AQUEOUS AND MINERAL-ORGANIC PHASES.

Objective

HUMIC AND FULVIC ACIDS ARE IMPORTANT TRANSFER VECTORS OF RADIONUCLIDES IN THE GEOSPHERE, PARTICULARLY IN THE POROUS SEDIMENTARY SYSTEMS. SUCH SYSTEMS ARE OBLIGED WAYS BETWEEN THE GEOLOGICAL FORMATION OF THE NUCLEAR WASTE STORAGE SITES (SALT OR CLAY OPTIONS) AND THE BIOSPHER. IN THE CASE OF THE GRANITIC FORMATION, WEATHERING MATERIALS OF FRACTURES OR MINED CAVITIES HAVE A SIMILAR BEHAVIOUR. INDEED THESE ACIDS, ALWAYS PRESENT IN THE UNDERGROUND WATERS, HAVE COMPLEXATION PROPERTIES WHICH CAN INDUCE HIGH MOBILITY SPECIES IN THE WATER-TABLE.
THESE ARE THE GOALS OF THE PROJECT:
- MEASUREMENTS OF HUMIC ACIDS MOLECULAR WEIGHT BY MEANS OF ULTRACENTRIFUGATION AND LIQUID CHROMATOGRAPHY (INTERCALIBRATION EXERCISE)
- FRACTIONATION AND ISOLATION OF HUMIC AND FULVIC SPECIES
- MEASUREMENTS OF THE COMPETITION BETWEEN THE DIFFERENT SPECIES IN THE SORPTION OF 156 EU, 99 TC, 241 AM, 238 PU BY MEANS OF A SPECIALLY-BUILT DIALYSIS DISPLAY.

1. CONSTRUCTION OF A POLYDIALYSIS REACTOR, DERIVED FROM AN EXISTING MODEL. THE CHOSEN MATERIAL IS P.T.F.E.
2. THE TESTED SAMPLES ORIGINATE IN BOOM (MOL, BELGIUM), GORLEBEN (F.R.G.), AND FANAY-AUGERES (FRANCE).
3. ESTIMATION OF THE COMPETITION AT EQUILIBRIUM CONDITIONS IS OBTAINED BY SORPTION CINETICS.
4. TAKING PART IN THE INTERCALIBRATION EXERCISE ON THE HUMIC AND FULVIC ACIDS.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

UNIVERSIT DE NANTES
Address
Quai De Tourville 1
44035 Nantes
France