Spectroscopic and structural studies of environmentally relevant Neptunium(V) and Plutonium(V) complexes
Conference
·
OSTI ID:126717
- and others
Carbonate and bicarbonate are common anions in natural waters, consequently carbonate complexes of the actinides may play an important role in their migration from a nuclear waste repository. Due to the relatively high solubility and redox stability of Np(V) and Pu(V), these ions are particularly important to consider. Carbonate complexation reactions were examined for NpO{sub 2}{sup +} and PuO{sub 2}{sup +} using a variety of techniques, including {sup 13}C and {sup 17}O NMR and UV-Vis-NIR spectroscopies, EXAFS studies have been performed on both solid state and solution species. Previously, NpO{sub 2}{sup +}, carbonates have been difficult to observe by UV-Vis-NIR spectroscopy due to the formation of insoluble NaNp{sub 2}O{sub 2}(CO{sub 3}) or Na{sub 3}NpO{sub 2}(CO{sub 3}){sub 2} salts. However, by employing tetrabutylammonium as the counter cation, millimolar concentrations have been obtained and utilized for temperature dependent carbonate complexation studies by NMR and UV-Vis-NIR spectroscopy.
- OSTI ID:
- 126717
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Spectroscopic and structural studies of environmentally relevant neptunyl carbonate complexes
Report on neptunium speciation by NMR and optical spectroscopies
Preliminary measurements of B{sup 0} and B{sup +} lifetimes at SLD
Conference
·
Thu Nov 30 23:00:00 EST 1995
·
OSTI ID:126230
Report on neptunium speciation by NMR and optical spectroscopies
Technical Report
·
Tue Oct 31 23:00:00 EST 1995
·
OSTI ID:207419
Preliminary measurements of B{sup 0} and B{sup +} lifetimes at SLD
Conference
·
Tue Aug 01 00:00:00 EDT 1995
·
OSTI ID:207375