Research in actinide chemistry. Final report, March 1, 1993--February 28, 1996

Technical Report · Wed Jan 01 04:00:00 EST 1997

DOI:https://doi.org/10.2172/464183· OSTI ID:464183

Choppin, G R

The present three-year grant period has been a fruitful one for the laboratory as research entered some new areas while continuing in others in which the group has been successful. As in past grant periods, the principal focus has been on complexation of actinide elements with inorganic and organic ligands. The ligands to study have been chosen for their value (known or potential) in actinide separations or for their potential role in environmental behavior of the actinides. Since the radioactivity of some actinides limits the variety of techniques which can be used in their study, we have used {open_quotes}oxidation state analogs{close_quotes}. These analogs have the same oxidation state and very similar chemical behavior but are stable or very long-lived. Also, the analogs are chosen for their redox stability to avoid uncertainties in interpretation of systems in which several oxidations may coexist (e.g., in the case of Pu). Examples of such analogs which we have used are: Nd(III), Eu(III) for Pu(III), Am(III), Cm(III); Th(IV) for U(IV), Pu(IV); NpO{sub 2}{sup +} for PuO{sub 2}{sup +}; UO{sub 2}{sup 2+} for NpO{sub 2}{sup 2+}, PuO{sub 2}{sup 2+}. These analogs have allowed use of techniques which can increase significantly our understanding of actinide complexation.

• Research Organization: Florida State Univ., Tallahassee, FL (United States). Dept. of Chemistry
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: FG02-96ER14618
• OSTI ID: 464183
• Report Number(s): DOE/ER/14618--T1; ON: DE97005235
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ACTINIDES
COMPLEXES
EQUATIONS
EUROPIUM
LIGANDS
NEPTUNIUM OXIDES
PH VALUE
PLUTONIUM DIOXIDE
PROGRESS REPORT
RADIOACTIVITY
RADIOCHEMISTRY
SILICATES
SOLVENT EXTRACTION
SPECTRA
STABILITY
THERMODYNAMIC PROPERTIES
THORIUM
URANIUM DIOXIDE
VALENCE