Investigation into the Solubilities. Sorption and Migration Behaviour of Agl. CsNO3, Na2U2O7. NpO2OH and Pu(OH)4 in Near-Field-Systems

MRS Proceedings ◽

10.1557/proc-127-855 ◽

1988 ◽

Vol 127 ◽

Cited By ~ 1

Author(s):

G. Marx ◽

Ch. Keiling

Keyword(s):

Near Field ◽

Salt Dome ◽

Salt Solutions ◽

Migration Behaviour ◽

Field Environment ◽

Field Systems ◽

And Migration

ABSTRACTResults are presented from investigations into the solubilities, sorption and migration behaviour of Agi. CsNO3, Na2U2O7. NpO2hOH and Pu(OH)4 in the near-field environment of an ILW repository located in a salt dome. Emphasis is placed on the synthetic complexing organics DBP, TBP, EDTA, citrate and oxalate, which influence the leaching and retardation of the above elements. Leachate data from real ILW forms, obtained from saturated salt solutions, have been compared with the results of the synthetic systems described.

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Investigations Into the Mobilization of Actinides From ILW Conditioned in Cement and Bitumen and Studies of their Sorptive and Migration Behaviour in Both the Near- and Far-Fields for a Repository Contained in a Deep Salt Environment

MRS Proceedings ◽

10.1557/proc-50-691 ◽

1985 ◽

Vol 50 ◽

Author(s):

A. R. Flambard ◽

H.-U. Fusban ◽

Ch. Keiling ◽

G. Marx

Keyword(s):

Salt Solution ◽

Ph Effect ◽

Salt Dome ◽

The Other ◽

Competitive Sorption ◽

Salt Solutions ◽

Northern Germany ◽

Mobility Studies ◽

Simulated Waste ◽

And Migration

AbstractExperiments have been carried out into the leaching of ILW conditioned in cement and bitumen in concentrated salt solutions. Although difficult to observe with real waste leachates, investigations into the leaching of a simulated waste in cement have indicated leached transuranic levels of ca. 10−9 M ; the amount of activity leached by a quinary salt solution being 102 - 103 times higher . This has been interpreted in terms of a pH effect. For the real waste, spectroscopy has indicated a significantly larger release of Cs from cement than from bitumen. For all waste samples a notable absence of colloidal material was observed ; an observation which can be explained in terms of the high solution ionic strengths and the corresponding influence upon radionuclide solvation.Transuranic mobility studies through salt and sand from a salt dome in Northern Germany have shown the presence of at least two types of species of wildly differing mobility ; one migrating with approximately the same velocity as that of the solvent front and the other strongly retarded. Actinide recoveries (i.e. that passing through the columns) could be strongly influenced by either changing the system pH or by the addition of a competitor such as Ce ; the latter effect pointing to a competitive sorption.

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