Complexing of tetravalent plutonium in aqueous solutions

The Thermodynamics of Plutonium(IV) Complexation by Fluoride and its Effect on Plutonium (IV) Speciation in Natural Waters

“…BAGAWDE etal. [3] investigated this possibility under nearly identical conditions, and found no evidence for the extraction of PuF^'" by TTA.…”

“…Conditional stability constants determined by the least squares program are summarized in Table 1 along with the calculated enthalpies and entropies. Error analysis of the stability constants was accomplished by the accumulation of errors technique including consideration of aqueous complexes PuNOs and Pu(TTA)^ [3], The error limits for AH and AS were determined from the uncertainties in ot and ß and from the regression analysis of the van't Hoff plots (Fig. 2).…”

“…Reported stability constants for the reaction represented by equation (1) Vary from a low of 4.26 x 10^ [2] to a high of 4.37 x iC [3] with a scattering of results in between these extremes [4][5][6].…”

Free Energy, Enthalpy, and Entropy of Plutonium(IV) - Sulfate Complexes

“…This system has been studied by spectrophotometric, Potentiometrie, electromigration, and various solvent-extraction and ion-exchange methods. Reported values of the stability constant for the 1:1 complex vary from 130 to 1.0 x 10* [1][2][3][4]. Stoichiometries from 1: 1 to 1: 8 have been reported.…”

Development of a Fast and Efficient Separation for Short-Lived Plutonium Isotopes Produced in Accelerator-Based Irradiations

“…Efficiency: A chemical yield for plutonium of > 50 % was needed because the low production rate predicted for 231Pu results in only about 1000 atoms per hour for our experimental conditions (2). 3. Selectivity: Competitive charged particle evaporation reactions (pxn, 2pxn, axn and upxn) produce isotopes of neptunium, uranium, protactinium, and thorium in much larger amounts.…”