Effect of reducing agents on the uranium concentration above uranium(IV) amorphous precipitate in Boom Clay pore water

Grégory Delécaut; N. Maes; P. De Cannière; L. Wang

doi:10.1524/ract.92.9.545.54969

Effect of reducing agents on the uranium concentration above uranium(IV) amorphous precipitate in Boom Clay pore water

Grégory Delécaut, N. Maes, P. De Cannière, L. Wang

Research output › peer-review

Abstract

The solubility of U(IV) amorphous precipitates was measured in Boom Clay water in the presence of reducing agents and under the in situ partial pressure of CO₂(g) at 10^-2.4 atm. Boom Clay pore water is of the sodium bicarbonate type (NaHCO₃ ∼ 10^-2 M) and contains about 100 mg 1^-1 of dissolved organic carbon. The total U concentration measured after two-months equilibrating time and the 0.45 μm filtration was about 10^-6 M and higher. This concentration is about 3 orders of magnitude higher than literature data for U(IV) solubility and may suggest the existence of colloids and/or U(VI) species. The U concentration was found decreasing as a function of time within the experimental period. Further experiments are currently performed to evaluate the contribution of the colloids and the role of organic matter.

Original language	English
Pages (from-to)	545-550
Number of pages	6
Journal	Radiochimica Acta
Volume	92
Issue number	9-11
DOIs	https://doi.org/10.1524/ract.92.9.545.54969
State	Published - 2004

ASJC Scopus subject areas

Physical and Theoretical Chemistry

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Cite this

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title = "Effect of reducing agents on the uranium concentration above uranium(IV) amorphous precipitate in Boom Clay pore water",

abstract = "The solubility of U(IV) amorphous precipitates was measured in Boom Clay water in the presence of reducing agents and under the in situ partial pressure of CO2(g) at 10-2.4 atm. Boom Clay pore water is of the sodium bicarbonate type (NaHCO3 ∼ 10-2 M) and contains about 100 mg 1-1 of dissolved organic carbon. The total U concentration measured after two-months equilibrating time and the 0.45 μm filtration was about 10-6 M and higher. This concentration is about 3 orders of magnitude higher than literature data for U(IV) solubility and may suggest the existence of colloids and/or U(VI) species. The U concentration was found decreasing as a function of time within the experimental period. Further experiments are currently performed to evaluate the contribution of the colloids and the role of organic matter.",

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T1 - Effect of reducing agents on the uranium concentration above uranium(IV) amorphous precipitate in Boom Clay pore water

AU - Delécaut, Grégory

AU - Maes, N.

AU - De Cannière, P.

AU - Wang, L.

PY - 2004

Y1 - 2004

N2 - The solubility of U(IV) amorphous precipitates was measured in Boom Clay water in the presence of reducing agents and under the in situ partial pressure of CO2(g) at 10-2.4 atm. Boom Clay pore water is of the sodium bicarbonate type (NaHCO3 ∼ 10-2 M) and contains about 100 mg 1-1 of dissolved organic carbon. The total U concentration measured after two-months equilibrating time and the 0.45 μm filtration was about 10-6 M and higher. This concentration is about 3 orders of magnitude higher than literature data for U(IV) solubility and may suggest the existence of colloids and/or U(VI) species. The U concentration was found decreasing as a function of time within the experimental period. Further experiments are currently performed to evaluate the contribution of the colloids and the role of organic matter.

AB - The solubility of U(IV) amorphous precipitates was measured in Boom Clay water in the presence of reducing agents and under the in situ partial pressure of CO2(g) at 10-2.4 atm. Boom Clay pore water is of the sodium bicarbonate type (NaHCO3 ∼ 10-2 M) and contains about 100 mg 1-1 of dissolved organic carbon. The total U concentration measured after two-months equilibrating time and the 0.45 μm filtration was about 10-6 M and higher. This concentration is about 3 orders of magnitude higher than literature data for U(IV) solubility and may suggest the existence of colloids and/or U(VI) species. The U concentration was found decreasing as a function of time within the experimental period. Further experiments are currently performed to evaluate the contribution of the colloids and the role of organic matter.

KW - Amorphous

KW - Boom Clay

KW - Solubility

KW - Uranium(IV)

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