EXAFS spectroscopic study of neptunium(V) sorption at the .alpha.-iron hydroxide oxide (.alpha.-FeOOH)/water interface

Combes, J. M.; Chisholm-Brause, Catherine J.; Brown, Gordon E.; Parks, George S.; Conradson, Steven D.; Eller, P. G.; Triay, I.R.; Hobart, David E.; Miejer, Arend

doi:10.1021/es00026a020

Cited by 143 publications

(138 citation statements)

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“…However, experiments with transuranics have been very limited in number (Kalkowski, Kaindl, Bertram et al, 1987;Petit-Maire et al, 1989;Combes et al, 1992). In 1993 a US Department of Energy review established the fundamental basis of experimental and safety procedures for transuranic experiments at the Stanford Synchrotron Radiation Laboratory (SSRL), which enabled several EXAFS studies of solutions and solids containing Np and Pu (Allen, Veirs et al, 1996;Allen et al, 1997;Clark et al, 1997Clark et al, , 1998Conradson, 1998;Den Auwer et al, 1999).…”

Section: Synchrotron Radiation Beamlines For Studying Radioactive Matmentioning

confidence: 99%

ROBL – a CRG beamline for radiochemistry and materials research at the ESRF

Matz

Schell

Bernhard

et al. 1999

J Synchrotron Radiat

192

116

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The paper describes the Rossendorf beamline (ROBL) built by the Forschungszentrum Rossendorf at the ESRF. ROBL comprises two different and independently operating experimental stations: a radiochemistry laboratory for X-ray absorption spectroscopy of non-sealed radioactive samples and a general purpose materials research station for X-ray diffraction and re¯ectometry mainly of thin ®lms and interfaces modi®ed by ion beam techniques.

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Section: Synchrotron Radiation Beamlines For Studying Radioactive Matmentioning

confidence: 99%

ROBL – a CRG beamline for radiochemistry and materials research at the ESRF

Matz

Schell

Bernhard

et al. 1999

J Synchrotron Radiat

192

116

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“…This paper reviews the results of recent studies on the thermodynamics, optical properties and structures of Np(V) complexes with a series of dicarboxylate and oxydiamide ligands (Figure 1), emphasizing the relationship between the symmetry and optical properties and its importance in the interpretation of absorption spectra and the determination of thermodynamic parameters. [19,20], resulting in a structure without a center of inversion. As a result, the f-f transitions are allowed and the absorption bands at 980 and 1024 nm observed (Figure 2 3-.…”

Section: Introductionmentioning

confidence: 99%

Symmetry, Optical Properties and Thermodynamics of Neptunium(V) Complexes

Rao

Tian

2009

Symmetry

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“…Eckhardt et al showed that neptunium's affinity for iron oxide was very high within the range of 6.2-6.9 [2], and Nakayama et al looked at the range pH 4-11 and found that goethite had strong sorption above pH 6 [3]. An EXAFS study by Combes et al found that the neptunium removed from solution by goethite was a result of sorption, not precipitation or coprecipitation [4]. Studies done on montmorillonite found that neptunium sorption reached its maximum at pH.…”

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

confidence: 99%

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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EXAFS spectroscopic study of neptunium(V) sorption at the .alpha.-iron hydroxide oxide (.alpha.-FeOOH)/water interface

Cited by 143 publications

References 16 publications

ROBL – a CRG beamline for radiochemistry and materials research at the ESRF

ROBL – a CRG beamline for radiochemistry and materials research at the ESRF

Symmetry, Optical Properties and Thermodynamics of Neptunium(V) Complexes

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

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