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Phosphate-Sulfate Interaction in Simulated Low-level Radioactive Waste Glasses

Published online by Cambridge University Press:  15 February 2011

H. Li,
J. G. Darab,
D. W. Matson,
P. A. Smith,
P. Hrma,
Y. Chen and
J. Liu
H. Li
Affiliation:
Pacific Northwest National Laboratory, Box 999, P8–37, Richland, WA 99352
J. G. Darab
Affiliation:
Pacific Northwest National Laboratory, Box 999, P8–37, Richland, WA 99352
D. W. Matson
Affiliation:
Pacific Northwest National Laboratory, Box 999, P8–37, Richland, WA 99352
P. A. Smith
Affiliation:
Pacific Northwest National Laboratory, Box 999, P8–37, Richland, WA 99352
P. Hrma
Affiliation:
Pacific Northwest National Laboratory, Box 999, P8–37, Richland, WA 99352
Y. Chen
Affiliation:
Pacific Northwest National Laboratory, Box 999, P8–37, Richland, WA 99352
J. Liu
Affiliation:
Pacific Northwest National Laboratory, Box 999, P8–37, Richland, WA 99352
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Abstract

Using simulated low-level radioactive waste glasses, interaction between phosphate and sulfate in the glass network was systematically studied using Raman spectroscopy. Phosphate and sulfate interaction was shown to depend on the extent of saturation of both species in the glass. At elevated concentration level of phosphate and sulfate in combination, yet below the solubility limits, phosphate and sulfate both separated from the glass. In the 7-day product consistency test (PCT), the phase separated glasses were found to have higher normalized releases of sodium, phosphorous, sulfur, boron, and silicon than those of their baseline glasses without phase separation.

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