S. Amini et al., FIXATION OF ACTINIDE ELEMENTS INTO ZEOLITES ZEOTYPES AND FLEXCRETE-CEMENT MATRIX, Journal of radioanalytical and nuclear chemistry, 173(2), 1993, pp. 331-337
The leaching behavior of alpha-emitter radionuclides (uranium and amer
icium) from zeolite-L and the zeotype (SAPO-34) in a Flexcrete-cement
matrix were examined by static and dynamic methods using 0.005 M CaCl2
and synthetic ground water as leachants. The leaching rates of UO22were 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 UO22+ for SAPO-34 in CaCl2 and synthetic
ground water were ten orders of magnitude lower than those for L. SAP
O-34 showed good selectivity for uranium at pH 2-3.5 and L was usefull
y selective for Am3+. Distribution coefficients of Am3+ and UO22+ incr
eased with equilibrium pH.