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Fixation of actinide elements into zeolites/zeotypes and Flexcrete-cement matrix |
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| Authors: | S Amini A Dyer S K Durrani |
| Institution: | (1) Department of Chemistry and Applied Chemistry, University of Salford, M5 4WT Salford, (UK);(2) Present address: National Atomic Energy Agency for Indonesia, PEBN-BATAN, Kawasan PUSPIPTEK, Serpong, 15310, Indonesia;(3) Present address: Pakistan Atomic Energy Commission, PINSTECH, P.O. Nilore, Islamabad, Pakistan |
| Abstract: | The leaching behavior of  -emitter radionuclides (uranium and americium) from zeolite-L and the zeotype (SAPO-34) in a Flexcrete-cement matrix were examined by static and dynamic methods using 0.005M CaCl2 and synthetic ground water as leachants. The leaching rates of UO
2
2+
were found to be higher by about ten orders of magnitude than those of Am3+ for both zeolite-L and SAPO-34 in the cement matrix. The static and dynamic leaching rates of UO
2
2+
for SAPO-34 in CaCl2 and synthetic ground water were ten orders of magnitude lower than those for L. SAPO-34 showed good selectivity for uranium at pH 2–3.5 and L was usefully selective for Am3+. Distribution coefficients of Am3+ and UO
2
2+
increased with equilibrium pH. |
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