Solvent Extraction Behavior of Neptunium (IV) Ions between Nitric Acid and Diluted 30% Tri-butyl Phosphate in the Presence of Simple Hydroxamic Acids

Formo- and aceto-hydroxamic acids are very effective reagents for stripping tetravalent actinide ions such as Np(IV) and Pu(IV) ions from a tri-butyl phosphate phase into nitric acid. Distribution data for Np(IV) in the presence of these hydroxamate ions have now been accumulated and trends establis...

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Bibliographic Details
Published in:Solvent extraction and ion exchange 2008-01, Vol.26 (1), p.41-61
Main Authors: Taylor, R. J., Sinkov, S. I., Choppin, G. R., May, I.
Format: Article
Language:English
Subjects:
acetohydroxamic acid
actinide separations
Advanced Purex
AFFINITY
distribution coefficient
Formohydroxamic acid
HYDROXAMIC ACIDS
NEPTUNIUM
NITRIC ACID
NUCLEAR FUEL CYCLE AND FUEL MATERIALS
RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
SOLVENT EXTRACTION
stability constant
TBP
VALENCE
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Summary:Formo- and aceto-hydroxamic acids are very effective reagents for stripping tetravalent actinide ions such as Np(IV) and Pu(IV) ions from a tri-butyl phosphate phase into nitric acid. Distribution data for Np(IV) in the presence of these hydroxamate ions have now been accumulated and trends established. Stability constants for aceto-hydroxamate complexes of Np(IV) and Np(V) ions have also been determined in a perchlorate medium, and these reaffirm the affinity of hydroxamate ligands for actinide (IV) ions over actinyl (V,VI) ions.
ISSN:0736-6299
1532-2262
DOI:10.1080/07366290701784159