Kinetic Rate Law Parameter Measurements on a Borosilicate Waste Glass: Effect of Temperature, pH, and Solution Composition on Alkali Ion Exchange
Conference
·
OSTI ID:15020487
The reaction kinetics of glass is controlled by matrix dissolution and ion exchange (IEX). Dissolution of an alkali-rich simulated borosilicate waste glass was investigated using single-pass flow-through (SPFT) experiments. Experiments were conducted as a function of temperature, pH, and solution composition by varying the SiO2 (aq) activity in the influent solution. Results showed that under dilute conditions matrix dissolution increased with increasing pH and temperature, and decreased with increasing SiO2 (aq) activity. IEX rates decreased with increasing pH and temperature, and increased with increasing SiO2 (aq) activity. Over the solution composition range interrogated in this study the dominant dissolution mechanism changed from matrix dissolution to IEX. These results suggest that “secondary” reactions may become dominant under certain environmental conditions and emphasize the need to incorporate these reactions into dissolution rate models.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 15020487
- Report Number(s):
- PNNL-SA-41693; 830403000
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
BOROSILICATE GLASS
CHEMICAL COMPOSITION
DISSOLUTION
Glass
dissolution
kinetic rate law parameters
borosilicate
HYDROXIDES
ION EXCHANGE
PH VALUE
RADIOACTIVE WASTE DISPOSAL
REACTION KINETICS
TEMPERATURE DEPENDENCE
WASTE FORMS
36 MATERIALS SCIENCE
BOROSILICATE GLASS
CHEMICAL COMPOSITION
DISSOLUTION
Glass
dissolution
kinetic rate law parameters
borosilicate
HYDROXIDES
ION EXCHANGE
PH VALUE
RADIOACTIVE WASTE DISPOSAL
REACTION KINETICS
TEMPERATURE DEPENDENCE
WASTE FORMS