The initial dissolution rates of simulated UK Magnox–ThORP blend nuclear waste glass as a function of pH, temperature and waste loading
Journal Article
·
· Mineralogical Magazine
The first comprehensive assessment of the dissolution kinetics of simulant Magnox–THORP blended UK high-level waste glass, obtained by performing a range of single-pass flow-through experiments, is reported here. Inherent forward rates of glass dissolution were determined over a temperature range of 23 to 70°C and an alkaline pH range of 8.0 to 12.0. Linear regression techniques were applied to the TST kinetic rate law to obtain fundamental parameters necessary to model the dissolution kinetics of UK high-level waste glass (the activation energy (Ea), pH power law coefficient (η) and the intrinsic rate constant (k0)), which is of importance to the post-closure safety case for the geological disposal of vitreous products. The activation energies based on B release ranged from 55 ± 3 to 83 ± 9 kJ mol–1, indicating that Magnox–THORP blend glass dissolution has a surface-controlled mechanism, similar to that of other high- level waste simulant glass compositions such as the French SON68 and LAW in the US. Forward dissolution rates, based on Si, B and Na release, suggested that the dissolution mechanism under dilute conditions, and pH and temperature ranges of this study, was not sensitive to composition as defined by HLW-incorporation rate.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1406837
- Report Number(s):
- PNNL-SA--121536; 830403000
- Journal Information:
- Mineralogical Magazine, Journal Name: Mineralogical Magazine Journal Issue: 6 Vol. 79; ISSN 0026-461X
- Publisher:
- Mineralogical Society
- Country of Publication:
- United States
- Language:
- English
Similar Records
The corrosion of UK vitrified waste during disposal
An Experimental Study of the Dissolution Rates of Simulated Aluminoborosilicate Waste Glasses as a Function of pH and Temperature under Dilute Conditions
The effects of silicic acid, aluminate ion activity and hydrosilicate gel development on the dissolution rate of a simulated British Magnox waste glass
Conference
·
Mon Jul 01 00:00:00 EDT 2019
·
OSTI ID:23005537
An Experimental Study of the Dissolution Rates of Simulated Aluminoborosilicate Waste Glasses as a Function of pH and Temperature under Dilute Conditions
Journal Article
·
Mon Sep 01 00:00:00 EDT 2008
· Applied Geochemistry, 23(9):2559-2573
·
OSTI ID:948403
The effects of silicic acid, aluminate ion activity and hydrosilicate gel development on the dissolution rate of a simulated British Magnox waste glass
Conference
·
Thu Jul 01 00:00:00 EDT 1999
·
OSTI ID:20015785