Solubility and Hydrolysis Behaviour of Neptunium(V)

Neck, V.; Kim, J. I.; Kanellakopulos, Β.

doi:10.1524/ract.1992.56.1.25

Cited by 109 publications

(173 citation statements)

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“…For oxidizing conditions, neptunium generally remains stable in a pentavalent oxidation state. In carbonate free solutions, NpO2OH(s) and Np2O5(s) are considered stable solid phases [1,[3][4][5][6], whereas MNpO2CO3⋅xH2O or M3NpO2(CO3)2 (M = Na + , K + ) or both are the solubility-limiting solid phases based on the X-ray powder diffraction in an equilibrium state containing carbonate. Therefore, one of the characteristics of the solubility-limiting solid phases of Np(V) is their strong reliance on the alkali carbonate concentration [1,[7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbonate on the Solubility of Neptunium in Natural Granitic Groundwater

Kim¹,

Oh²,

Baik³

et al. 2010

Nuclear Engineering and Technology

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Section: Introductionmentioning

confidence: 99%

Effect of Carbonate on the Solubility of Neptunium in Natural Granitic Groundwater

Kim¹,

Oh²,

Baik³

et al. 2010

Nuclear Engineering and Technology

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“…In their approach, Neck and Kim have considered an energy term describing the inner-ligand electrostatic repulsion 9 ).…”

Section: Introductionmentioning

confidence: 99%

Systematics of Complexation Constants of Actinide Ions with Inorganic Ligands

Moriyama

Fujiwara

Yamana

2002

Journal of Nuclear Science and Technology

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“…Figure 1 shows the scintillation assays results of Np concentration from our experiment in the supernate as a function of pH. The predicted concentration of neptunium in solution was calculated based on values from Neck et al [6]. As shown in the figure, concentration of neptunium in solution decreases significantly at pH greater than 10, because of precipitation of neptunium(V) hydroxide (Np020H).…”

Section: Appendix 1 Mit Contribution 23 September 1999-31 January 2000mentioning

confidence: 88%

Chemical Speciation of Neptunium in Spent Fuel. 1st Progress Report

Czerwinski¹,

Sherman²,

Reed³

2000

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Project OverviewThis project will examine the chemical speciation of neptunium in spent nuclear fuel. The R&D fields covered by the project include waste host materials and actinide chemistry. Examination of neptunium is chosen since it was identified as a radionuclide of concern by the NERI workshop. Additionally, information on the chemical form of neptunium in spent fuel is lacking. The identification of the neptunium species in spent fuel would allow a greater scientific based understanding of its long-term fate and behavior in waste forms.Research to establish the application and development of X-ray synchrotrons radiation (XSR) techniques to determine the structure of aqueous, adsorbed, and solid actinide species of importance to nuclear considerations is being conducted at Argonne. These studies extend current efforts within the Chemical Technology Division at Argonne National Laboratory to investigate actinide speciation with more conventional spectroscopic and solids characterization (e.g. SEM, TEM, and XRD) methods. Our project will utilize all these techniques for determining neptunium speciation in spent fuel.We intend to determine the chemical species and oxidation state of neptunium in spent fuel and alteration phases. Different types of spent fuel will be examined. Once characterized, the chemical behavior of the identified neptunium species will be evaluated if it is not present in the literature. Special attention will be given to the behavior of the neptunium species under typical repository near-field conditions (elevated temperature, high pH, varying Eh). This will permit a timely inclusion of project results into near-field geochemical models. Additionally, project results and methodologies have applications to neptunium in the environment, or treatment of neptunium containing waste.Another important aspect of this project is the close cooperation between a university and a national laboratory. The PI has a transuranic laboratory at MIT where students can perform spectroscopic and radiochemical experiments. Through the ANL partner, students can have additional experience performing research in a DOE setting. This will provide a unique and constructive opportunity for developing quality graduate students with experience and expertise in handling actinides. Our ability to produce experienced actinide scientists is currently restricted by the dearth of radiochemistry and nuclear research at universities. Regardless of all else, future researchers must be trained and educated if the United States is

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Solubility and Hydrolysis Behaviour of Neptunium(V)

Cited by 109 publications

References 10 publications

Effect of Carbonate on the Solubility of Neptunium in Natural Granitic Groundwater

Effect of Carbonate on the Solubility of Neptunium in Natural Granitic Groundwater

Systematics of Complexation Constants of Actinide Ions with Inorganic Ligands

Chemical Speciation of Neptunium in Spent Fuel. 1st Progress Report

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