Practical Modeling of aluminum species in high-pH waste

Reynolds, D.A.

doi:10.2172/116607

Cited by 9 publications

(14 citation statements)

References 3 publications

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“…Also, the number is continuosly increasing. For example, the announcement of the last candidate discovery appeared during the preparation of this manuscript [34]. Some of the sources (Cas A, Vela Junior) have according to spectral fits surprizingly small emitting areas.…”

Section: Central Compact Objects In Supernova Remnantsmentioning

confidence: 99%

The Zoo of neutron stars

Попов¹

2008

Phys. Part. Nuclei

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In these lecture notes I briefly discuss the present day situation and new discoveries in astrophysics of neutron stars focusing on isolated objects. The latter include soft gamma repeaters, anomalous X-ray pulsars, central compact objects in supernova remnants, the Magnificent seven, and rotating radio transients. In the last part of the paper I describe available tests of cooling curves of neutron stars and discuss different additional constraints which can help to confront theoretical calculations of cooling with observational data. 1

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Section: Central Compact Objects In Supernova Remnantsmentioning

confidence: 99%

The Zoo of neutron stars

Попов¹

2008

Phys. Part. Nuclei

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“…To date, no direct (i.e., spectroscopic) evidence has been reported to support the existence of the A102-species. However, this species has been invoked in a recent modeling study (1 The measured Raman depolarization ratios for the 537, 620, and 692 cm-' aluminate bands are 0.04, 0.0 1 and 0.17, respectively. The depolarization ratio can be used to distinguish totally and non-totally symmetric vibrations.…”

Section: Resultsmentioning

confidence: 99%

Microstructural Properties of High Level Waste Concentrates and Gels with raman and Infrared Spectroscopies

Agnew¹,

Schoonover²

1999

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“…The second constraint on Al(OH) 4 -given by equation 2 was based on Al solubility studies in strongly alkaline solutions [7] and ensures that Al(OH) 4 remains soluble at the high end of its concentration range. The constraint on total Na + was empirically determined during this study when attempts to prepare solutions containing high salt concentrations failed even when the solution compositions were based on an experimental design utilizing constraints 1 and 2.…”

Section: Constraints On Concentrationmentioning

confidence: 99%

Plutonium Solubility in Simulated Savannah River Site Waste Solutions

Rudisill

Hobbs

Edwards

2010

Separation Science and Technology

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To address the accelerated disposition of the supernate and salt portions of Savannah River Site (SRS) high level waste (HLW), solubility experiments were performed to develop a predictive capability for plutonium (Pu) solubility. A statistically designed experiment was used to measure the solubility of Pu in simulated solutions with salt concentrations and temperatures which bounded those observed in SRS HLW solutions. Constituents of the simulated waste solutions included: hydroxide (OH No discernable time dependence of the measured Pu concentrations was observed except for two salt solutions equilibrated at 80 C which contained OH -concentrations > 5 mol/L. In these solutions, the Pu solubility increased with time. This observation was attributed to the air oxidation of a portion of the Pu from Pu(IV) to the more soluble Pu(V) or Pu(VI) valence states. A data driven approach was subsequently used to develop a modified response surface model for Pu solubility. Solubility data from this study and historical data from the literature were used to fit the model. The model predicted the Pu solubility of the solutions from this study within the 95% confidence interval for individual predictions and the analysis of variance indicated no statistically significant lack of fit.The Savannah River National Laboratory (SRNL) model was compared with predicted values from the Aqueous Electrolyte (AQ) model developed by OLI Systems, Inc. and a solubility prediction equation developed by Delegard and Gallagher for Hanford tank waste. The agreement between measured or values predicted by the SRNL model and values predicted by the OLI AG model was very poor. The much higher predicted concentrations by the OLI AQ model appears to be the result of the model predicting the predominate Pu oxidation state is Pu(V) which is reported as unstable below sodium hydroxide (NaOH) concentrations of 6 M. There was very good agreement between the predicted Pu concentrations using the SRNL model and the model developed by Delegard and Gallagher with the exception of solutions that had very high OH -(15 M) concentrations. The lower Pu solubilities in these solutions were attributed to the presence of NO 3 -and NO 2

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Practical Modeling of aluminum species in high-pH waste

Cited by 9 publications

References 3 publications

The Zoo of neutron stars

The Zoo of neutron stars

Microstructural Properties of High Level Waste Concentrates and Gels with raman and Infrared Spectroscopies

Plutonium Solubility in Simulated Savannah River Site Waste Solutions

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