Partners
Contact
Dr. V. Neck
Forschungszentrum Karlsruhe-INE - P.O.Box 3640 - 76021 Karlsruhe - Germany  + 49 (0) 7247 82 2592 |
Aquatic chemistry and thermodynamics of actinides: Solubility, hydrolysis and complexation of tetravalent actinides
Status
| Terminated |
- Planned from October 2004 till May 2006 |
Goals
The main objective of this joint research project is to provide sound thermodynamic data on tetravalent actinides in aqueous solution (including: solubility products of various amorphous and crystalline solids, as well as hydrolysis- and complexation constants for selected inorganic ligands). The formation, constitution and stability of true colloids of Zr(IV) and An(IV) oxyhydroxides will also be studied to elucidate their influence on the solubility of the tetravalent elements.
Expected results
The thermodynamic data on tetravalent actinides fill important gaps in thermodynamic databases. Among others, they will be used as input data for geochemical modelling in safety- and performance assessment of nuclear waste repositories.
Publications
- Altmaier M., Neck V., Müller R., Fanghänel Th..- Solubility of ThO2.xH2O(am) in carbonate solution and the formation of ternary Th(IV) hydroxide-carbonate complexes- In: Radiochim. Acta, 93(2005), p. 83-92
- Cho H.R., Walther C., Rothe, Neck V.J., Denecke M.A., Dardenne K..- Combined LIBD and XAFS Investigation of the Formation and Structure of Zr(IV) Colloids- In: Anal. Bioanal. Chem., 383:1(2005), p. 28-40
Presentations
- Cho H.R., Marquardt C.M., Neck V., Seibert A., Walther C., Yun J.I., Fanghänel Th., "Hydrolysis of Pu(IV) studied by measurements of the Pu(IV)/Pu(III) redox equilibrium combined with spectroscopy", 10th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere (Migration ’05) 18-23 September 2005/ Avignon, France, 2005. Presentation
- Michel N., Landesman C., Richard M., Brohan L., Grambow B., "Solubility of Zirconium(IV) Oxyhydroxides: Composition and Structural Effects, Surface Properties Influences", 10th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere (Migration ’05) 18-23 September 2005/ Avignon, France, 2005. Presentation
- Neck V., Altmaier M., Fanghänel Th., "Solubility of AnO2.xH2O(am) in carbonate solution and formation of ternary An(IV) hydroxide-carbonate complexes", 10th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere (Migration ’05) 18-23 September 2005/ Avignon, France, 2005. Presentation
- Neck V., Altmaier M., Fanghänel Th., "Hydrous PuO2+x(s): Solubility and thermodynamic data", 10th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere (Migration ’05) 18-23 September 2005/ Avignon, France, 2005. Presentation
- Opel K., Hübener S., Weiß S., Zänker H., Bernhard G., "Investigations of Environmentally Colloids by Laser-Induced Breakdown Detection (LIBD)" 10th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere (Migration ’05) 18-23 September 2005/ Avignon, France, 2005. Presentation
- Cho H.R., Walther C., Rothe J., Denecke M.A., Neck V., Fanghänel Th., "Solubility of Zr(IV) oxide/hydroxide with LIBD and EXAFS", GdCH-Jahrestagung 11-14 September 2005/ Düsseldorf, Germany, 2005. Presentation
- Marquardt C.M., Panak P.J., Walther C., Klenze R., Fanghänel Th., "Fluorescence Spectroscopy of Protactinium(IV)", Actinides 2005 4-8 July 2005/ Manchester, UK, 2005. Presentation
- Neck V., Altmaier M., Fanghänel Th., "Solubility and Redox Reactions of PuO2.xH2O(s) in the Presence of Oxygen", Actinides 2005 4-8 July 2005/ Manchester, UK, 2005. Presentation
- Opel K., Hübner S., Weiß S., Zänker H., Bernhard G., "Solubility Studies of Uranium(IV) by Laser-Induced Breakdown Detection (LIBD)", Actinides 2005 4-8 July 2005/ Manchester, UK, 2005. Presentation
Reports
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