Solubility product of plutonium hydrous oxide and its ionic strength dependence
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K. Fujiwara
Summary
The solubility of PuO2·xH2O was measured at 25°C in a NaClO4 solution containing Na2S2O4 as a reductant. The experiment was carried out by an oversaturation method at I = 1.0 and by an undersaturation method at I = 0.5, 1.0 and 2.0. The concentration of Pu3+ was measured by α-spectrometry and UV/Visible spectrophotometry, and the equilibrium constant of the reaction, PuO2·xH2O + e− = Pu3+ + 4 OH− + (x–2) H2O, was obtained. From the obtained results, the solubility product (Ksp) of PuO2·x H2O, for PuO2·x H2O = Pu4+ + 4 OH− + (x − 2) H2O at I = 0.5, 1.0 and 2.0 was determined. By using the specific interaction theory (SIT), the solubility product of PuO2·x H2O at the standard state (I = 0) was determined to be log K°sp = −57.97 ± 0.24, and the ion interaction coefficient ε(Pu4+, ClO4-) was also evaluated to be 0.99 ± 0.20.
© Oldenbourg Wissenschaftsverlag, München
Artikel in diesem Heft
- 239Pu and 241Am (n, 2n) cross-section measurements near En = 14 MeV
- Radiochemical studies relevant to the production of 86Y and 88Y at a small-sized cyclotron
- Berkelium redox speciation
- Solubility product of plutonium hydrous oxide and its ionic strength dependence
- Effective diffusivity of neptunium and plutonium in granite from Inada, Ibaraki, Japan under anaerobic conditions
- Theoretical predictions of hydrolysis and complex formation of group-4 elements Zr, Hf and Rf in HF and HCl solutions
- Evidence for the existence of Tc(IV) – humic substance species by X-ray absorption near-edge spectroscopy
- Measurement of L3 to M shell vacancy transfer probabilities of Th and U
- Radiochemical neutron activation analysis of trace impurities in high purity titanium and tungsten
- Thermochromatography of 241Am and 254Es in chlorinating carrier gases
Artikel in diesem Heft
- 239Pu and 241Am (n, 2n) cross-section measurements near En = 14 MeV
- Radiochemical studies relevant to the production of 86Y and 88Y at a small-sized cyclotron
- Berkelium redox speciation
- Solubility product of plutonium hydrous oxide and its ionic strength dependence
- Effective diffusivity of neptunium and plutonium in granite from Inada, Ibaraki, Japan under anaerobic conditions
- Theoretical predictions of hydrolysis and complex formation of group-4 elements Zr, Hf and Rf in HF and HCl solutions
- Evidence for the existence of Tc(IV) – humic substance species by X-ray absorption near-edge spectroscopy
- Measurement of L3 to M shell vacancy transfer probabilities of Th and U
- Radiochemical neutron activation analysis of trace impurities in high purity titanium and tungsten
- Thermochromatography of 241Am and 254Es in chlorinating carrier gases
