Berkelium redox speciation
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M.R. Antonio
Summary
The inner-sphere hydration environments of the Bk3+·nH2O and Bk4+·n′H2O aquo ions in 1 M HClO4 were determined and are viewed in the context of other 5f (actinide) and 4f (lanthanide) aquo ions. The formal potential of the Bk4+/Bk3+ redox couple and the reorganization of the hydration sphere, in terms of the average Bk–OH2 interatomic distances and number of coordinated water molecules (n and n′), were determined through in situ X–ray absorption spectroelectrochemistry. The participation of H2O in the electrochemical conversion and the rearrangement of the hydration environment upon reduction–oxidation are summarized in the equation: [Bk(OH2)8]4+ + H2O + e− ⇆ [Bk(OH2)9]3+. The change of hydration about 249Bk between the trivalent and tetravalent states is believed to reflect predominantly steric factors related to the difference of ionic radii, rather than electronic or bonding influences.
© 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
