Effects of surface area to volume ratio and surface roughness on waste glass leaching. [PNL 76-68, a simulated nuclear waste glass]
This study assesses the effects of surface roughness and surface area to solution volume (SA/V) ratio changes on the leaching of PNL 76-68, a simulated nuclear waste glass. Monolith specimens were used to avoid the difficulties associated with powders. Inductively Coupled Argon Plasma Spectroscopy (ICP) was used to analyze leachate solutions. Solid samples were depth profiled using Secondary Ion Mass Spectroscopy (SIMS). Corrosion of PNL 76-68 glass increased with increased surface roughness at a constant solution volume, in agreement with earlier studies on simple glasses. However, the increased leaching occurred only for several days at 90/sup 0/C, after which the rates of reaction of glasses given three widely different surface preparations were essentially identical. Surface roughness of a waste glass in a repository thus is not a major consideration in determining elemental release rates. In sharp contrast to the results of earlier studies on simple silicate glasses, leaching of PNL 76-68 glass strongly decreased with increases in the SA/V ratio. These findings imply that corrosion within cracks in a waste glass monolith exposed to water is much less important than previously suspected on the basis of simple glass measurements. Surfaces within small cracks in the waste glass are actually more durable than are the outer surfaces.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5703572
- Report Number(s):
- PNL-SA-9957; CONF-811088-3; ON: DE82005229; TRN: 82-004788
- Resource Relation:
- Conference: American Ceramic Society conference, Newport Beach, CA, USA, 25 Oct 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
GLASS
LEACHING
RADIOACTIVE WASTE DISPOSAL
WASTE-ROCK INTERACTIONS
BENCH-SCALE EXPERIMENTS
CORROSION
EXPERIMENTAL DATA
MASS SPECTROSCOPY
PLASMA
RADIOACTIVE WASTE PROCESSING
SOLID WASTES
SOLIDIFICATION
SURFACE AREA
VOLUME
CHEMICAL REACTIONS
DATA
DISSOLUTION
INFORMATION
MANAGEMENT
NUMERICAL DATA
PHASE TRANSFORMATIONS
PROCESSING
SEPARATION PROCESSES
SPECTROSCOPY
SURFACE PROPERTIES
WASTE DISPOSAL
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
052002* - Nuclear Fuels- Waste Disposal & Storage
052001 - Nuclear Fuels- Waste Processing
360604 - Materials- Corrosion
Erosion
& Degradation