<報文>Na型およびH型ゼオライトに対するCs, Sr, Ce, EuおよびTbの分配

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Effects of pH on the distribution of radioisotopes, ^<137>Cs, ^<85>Sr, ^<144>Ce, ^<152,4>Eu and ^<160>Tb, into synthetic zeolites (A, X and Y), synthetic mordenite, natural mordenite and clinoptilolite have been investigated. Cesium ion was preferentially distributed into mordenite with a high distribution coefficient (K_<Cs>=10^4) from acidic aqueous solution of pH 1 to 3. As for strontium, the K_<Sr> values into zeolites A, X and Y attained about 10^4 in the neutral region, but markedly decreased with increasing acidity. The distributions of rare earth elements at tracer-level concentrations into six kinds of Na-type zeolites were shown by the curves with a maximum at a different equilibrium pH. In the presence of carrier (10 ppm), these distribution curves broadened and overlapped. In the case of H-type zeolites, the cesium ion was also captured by zeolite in the acidic region (K_<Cs>=10^4), while the multivalent cations had low distribution coefficients less than 10^2 at pH 2 and the K values decreased with increase in acidity.
東北大学の論文
1979-03-20