Modeling surface area to volume effects on borosilicate glass dissolution

Conference · Sun Nov 01 04:00:00 EST 1992

OSTI ID:10148672

Bourcier, W L ^[1]; Ebert, W L; Feng, X ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. Argonne National Lab., IL (United States)

We simulated the reaction of SRL-131 glass with equilibrated J-13 water in order to investigate the effects of surface area to volume ratio (SA/V) on glass dissolution. We show that glass-fluid ion exchange causes solution pH to rise to progressively higher values as SA/V increases. Because the ion exchange is rapid relative to the duration of the glass dissolution experiment, the pH effect does not scale with (SA/V)*time. Experiments compared at the same (SA/V)*time value therefore have different pHs, with higher pHs at higher SA/V ratios. Both experimental data and our simulation results show similar trends of increasing reaction rate as a function of SA/V ratio when scaled to (SA/V)*time. Glasses which react in systems of differing SA/V ratio therefore follow different reaction paths and high SA/V ratios cannot be used to generate data which accurately scales to long time periods unless the ion exchange effect is taken into account. We suggest some simple test designs which enable more reliable high. SA/V accelerated tests.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48; W-31109-ENG-38
• OSTI ID: 10148672
• Report Number(s): UCRL-JC--112832; CONF-921101--111; ON: DE93011891
• Country of Publication: United States
• Language: English

Related Subjects

052001
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
360604
BOROSILICATE GLASS
CHEMICAL REACTION KINETICS
CORROSION, EROSION, AND DEGRADATION
DISSOLUTION
HIGH-LEVEL RADIOACTIVE WASTES
ION EXCHANGE
MATHEMATICAL MODELS
PH VALUE
RADIOACTIVE WASTE PROCESSING
TESTING
WASTE FORMS
WASTE PROCESSING