Determination of Formation Constants, Solubilities, and Ionic Speciation of Uranium, Plutonium and Thorium in Aqueous and Saturated Salt Solutions for Modelling Safety Aspects of Ilw Repositories

Bischoff, H.; Kramer-Schnabel, U.; Esser, V.; Xi, Ruihua; Heppner, P.-M.; Marx, G.

doi:10.1557/proc-257-331

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…(1) Under the high pH of the present experimental conditions, the solid phase of Np0 2 (0H) 2 to be >10 409 . Thus, the mole fraction ratio of Np0 2 (0H) 2(s) to Np0 2 C0 3(s) can be calculated to be >10 532 by taking the solubility products of Np0 2 (0H) 2(s) (l0g K sp = -22.70 [15]) and Np0 2 C0 3(s) (log K sp = -13.29 [16]). As expected, Np0 2 (0H) 2(s) is found to dominate in the solid phase under the present conditions.…”

Section: Speciation At Lower Ph Regionmentioning

confidence: 99%

Hydrolysis and Carbonate Complexation of Np(VI) in High pH Solutions

1995

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A spectroscopic study of Np(VI) was performed in carbonate solutions of high pH. Up to pH 12.5, the characteristic absorption bands were observed at 625, 670, and 703 nm. By considering the presence of Np0 2 (0H) 2(s) as the solid phase, the result was analyzed by the reaction of Np0 2 (0H) 2(s , + CO?" = Np0 2 (0H) 2 C0r.At pH>12.5, the new characteristic absorption bands centered at 530, 600, and 640 nm were observed in place of 625, 670, and 703 nm. The absorbancies increased with the increase of pH. From the observations, it was predicted that the Np0 2 (0H) 2 C0r was transformed to Np0 2 (0H) 3 " at high pH.Np0 2 (0H) 2 C0f" + OH" = Np0 2 (OH) 3 " + CO?"· By measuring the solubility and taking the literature value of the Np0 2 (0H) 2(5) solubility product, the stability constant of Np0 2 (0H) 2 C0r was derived to be log ß 2 , = 20.11 ±0.23. The stability constant of Np0 2 (0H) 3 " was obtained as log/?·, = 19.61 ±0.11.

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Section: Speciation At Lower Ph Regionmentioning

confidence: 99%

Hydrolysis and Carbonate Complexation of Np(VI) in High pH Solutions

1995

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Corrections to the Uranium NEA-TDB review

Grenthe¹,

Sandino²,

Puigdomènech³

et al. 1995

Chemical Thermodynamics of Americium

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IUPAC-NIST Solubility Data Series. 84. Solubility of Inorganic Actinide Compounds

Miyamoto

2007

Journal of Physical and Chemical Reference Data

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This volume presents the solubility of inorganic compounds of actinides except for carbonates, which are included in Volume 74 of this series, and nitrates, which are covered in Volume 55. Also included are solubility data of compounds such as organosulfates, phosphates, and arsenates, which are not covered in Volume 74. The predominant part of this volume covers solubility data of thorium, uranium, neptunium, and plutonium compounds. Fewer data have been published for americium compounds and very few for compounds of actinium, protactinium, and transamericium elements. The literature has been covered up to the end of 2004. Documents which remained unavailable to the editor, and could not be included in the volume are listed in the Appendix. For some compounds it was not possible to show the Chemical Abstracts registry numbers since these have not been assigned.

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Determination of Formation Constants, Solubilities, and Ionic Speciation of Uranium, Plutonium and Thorium in Aqueous and Saturated Salt Solutions for Modelling Safety Aspects of Ilw Repositories

Cited by 4 publications

References 14 publications

Hydrolysis and Carbonate Complexation of Np(VI) in High pH Solutions

Hydrolysis and Carbonate Complexation of Np(VI) in High pH Solutions

Corrections to the Uranium NEA-TDB review

IUPAC-NIST Solubility Data Series. 84. Solubility of Inorganic Actinide Compounds

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