An investigation of the neptunium complexes formed upon interaction of high level waste glass and boom clay media

V. Pirlet; P. Van Iseghem; A. Dierckx

doi:10.1557/proc-556-993

An investigation of the neptunium complexes formed upon interaction of high level waste glass and boom clay media

V. Pirlet, P. Van Iseghem, A. Dierckx

Research output › peer-review

Abstract

Among the actinides which can be released from vitrified HLW, Neptunium-237 is considered as the most critical one in the Belgian performance assessment studies. Therefore, leaching experiments with Np-doped glass in humic acid containing Boom Clay water at different conditions were carried out. For the speciation of Np in the leachate, LPAS (Laser Photoacoustic spectroscopy) and UV-VIS absorption spectroscopy were used. The Np concentration in the leachates, after a slightly decrease, seems to approach a steady-state value at about 5×10^-7 M after 6 months of glass corrosion. The highest Np concentrations were observed for the highest S/V value and for the glass doped with the highest Np concentration, the combination of the two separate parameters leading to even higher Np concentrations in solution. Np is mainly bound to colloids. The first spectra of the leachates obtained by LPAS confirm the potentiality of this technique to characterise the Np species at low Np concentration and show the presence of Np(IV) complexes which have still to be identified. We can, therefore, anticipate that the Np steady-state concentration may be controlled by a Np(V)Teduction/precipitation process.

Original language	English
Pages (from-to)	993-1000
Number of pages	8
Journal	Materials Research Society Symposium - Proceedings
Volume	556
DOIs	https://doi.org/10.1557/proc-556-993
State	Published - 1999
Event	1998 - MRS Fall Meeting - Symposium 'Scientific Basis for Nuclear Waste Management XXII' - Boston Duration: 30 Nov 1998 → 4 Dec 1998

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1557/proc-556-993

Cite this

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title = "An investigation of the neptunium complexes formed upon interaction of high level waste glass and boom clay media",

abstract = "Among the actinides which can be released from vitrified HLW, Neptunium-237 is considered as the most critical one in the Belgian performance assessment studies. Therefore, leaching experiments with Np-doped glass in humic acid containing Boom Clay water at different conditions were carried out. For the speciation of Np in the leachate, LPAS (Laser Photoacoustic spectroscopy) and UV-VIS absorption spectroscopy were used. The Np concentration in the leachates, after a slightly decrease, seems to approach a steady-state value at about 5×10-7 M after 6 months of glass corrosion. The highest Np concentrations were observed for the highest S/V value and for the glass doped with the highest Np concentration, the combination of the two separate parameters leading to even higher Np concentrations in solution. Np is mainly bound to colloids. The first spectra of the leachates obtained by LPAS confirm the potentiality of this technique to characterise the Np species at low Np concentration and show the presence of Np(IV) complexes which have still to be identified. We can, therefore, anticipate that the Np steady-state concentration may be controlled by a Np(V)Teduction/precipitation process.",

author = "V. Pirlet and {Van Iseghem}, P. and A. Dierckx",

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AU - Van Iseghem, P.

AU - Dierckx, A.

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N2 - Among the actinides which can be released from vitrified HLW, Neptunium-237 is considered as the most critical one in the Belgian performance assessment studies. Therefore, leaching experiments with Np-doped glass in humic acid containing Boom Clay water at different conditions were carried out. For the speciation of Np in the leachate, LPAS (Laser Photoacoustic spectroscopy) and UV-VIS absorption spectroscopy were used. The Np concentration in the leachates, after a slightly decrease, seems to approach a steady-state value at about 5×10-7 M after 6 months of glass corrosion. The highest Np concentrations were observed for the highest S/V value and for the glass doped with the highest Np concentration, the combination of the two separate parameters leading to even higher Np concentrations in solution. Np is mainly bound to colloids. The first spectra of the leachates obtained by LPAS confirm the potentiality of this technique to characterise the Np species at low Np concentration and show the presence of Np(IV) complexes which have still to be identified. We can, therefore, anticipate that the Np steady-state concentration may be controlled by a Np(V)Teduction/precipitation process.

AB - Among the actinides which can be released from vitrified HLW, Neptunium-237 is considered as the most critical one in the Belgian performance assessment studies. Therefore, leaching experiments with Np-doped glass in humic acid containing Boom Clay water at different conditions were carried out. For the speciation of Np in the leachate, LPAS (Laser Photoacoustic spectroscopy) and UV-VIS absorption spectroscopy were used. The Np concentration in the leachates, after a slightly decrease, seems to approach a steady-state value at about 5×10-7 M after 6 months of glass corrosion. The highest Np concentrations were observed for the highest S/V value and for the glass doped with the highest Np concentration, the combination of the two separate parameters leading to even higher Np concentrations in solution. Np is mainly bound to colloids. The first spectra of the leachates obtained by LPAS confirm the potentiality of this technique to characterise the Np species at low Np concentration and show the presence of Np(IV) complexes which have still to be identified. We can, therefore, anticipate that the Np steady-state concentration may be controlled by a Np(V)Teduction/precipitation process.

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