Sorption of strontium on uranyl peroxide: implications for a high-level nuclear waste repository

Journal of Hazardous Materials
Rosa SuredaJavier Giménez

Abstract

Strontium-90 is considered the most important radioactive isotope in the environment and one of the most frequently occurring radionuclides in groundwaters at nuclear facilities. The uranyl peroxide studtite (UO2O2 . 4H2O) has been observed to be formed in spent nuclear fuel leaching experiments and seems to have a relatively high sorption capacity for some radionuclides. In this work, the sorption of strontium onto studtite is studied as a function of time, strontium concentration in solution and pH. The main results obtained are (a) sorption is relatively fast although slower than for cesium; (b) strontium seems to be sorbed via a monolayer coverage of the studtite surface, (c) sorption has a strong dependence on ionic strength, is negligible at acidic pH, and increases at neutral to alkaline pH (almost 100% of the strontium in solution is sorbed above pH 10). These results point to uranium secondary solid phase formation on the spent nuclear fuel as an important mechanism for strontium retention in a high-level nuclear waste repository (HLNW).

References

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Feb 21, 2008·Environmental Science & Technology·Erich WielandRainer Dähn

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Citations

Sep 19, 2014·Journal of Hazardous Materials·Jun YinK Ulrich Mayer
Aug 14, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Saptarshi BiswasRobert J Baker
Nov 28, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Aurora WalsheRobert J Baker

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