Plutonium VI solubility studies in Savannah River Site high level waste
Pu(VI) was found to be stable in synthetic SRS waste supernate for periods of at least one month, and have a solubility of the order of 100 mg/l. Electromigration experiments found PU(VI) migrating toward the anode. Irradiation of synthetic waste tank supernate to 5 {times} 10{sup 6} R reduced Pu(VI) in solutions 6M NaOH and less, but had only a minor effect in higher NaOH concentrations. Irradiation did not affect Pu(VI) solubility in high-salt, high-NaOH solutions. Speciation studies found Pu(VI) the major valence of Pu in waste tank supernate solutions; some Pu(IV) is oxidized to Pu(VI) in strongly basic solutions to increase the Pu solubility. It is proposed that oxygen is the oxidizing agent for Pu(IV), with Pu(IV) disproportionation as a less likely possibility.
- Research Organization:
- Westinghouse Savannah River Co., Aiken, SC (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC09-89SR18035
- OSTI ID:
- 119880
- Report Number(s):
- WSRC-TR--95-0244; ON: DE96001658
- Country of Publication:
- United States
- Language:
- English
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