<報文>各種ゼオライトにおけるセシウムの動的交換特性に及ぼす共存イオン, カラム温度および流速の影響

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The effect of various diverse ions in solution, column temperature and flow rate on the dynamic exchange-properties of Cs have been studied with various types of zeolites, i.e., synthetic mordenite, natural mordenite and clinoptilolite. The concentration of nitric acid considerably affects on the break-through properties of Cs ; break-through capacity (B.T.Cap), total capacity (T.Cap) and column utilization (U) decrease with increasing acid concentration. The break-through data in the pH range (pH≥1) are as follows ; above 50 (meq./100g zeolite) for B.T.Cap, 110 (meq./100g zeolite) for T.Cap and 45 (%) for U, respectively. On the other hand, the concentration of formic acid (≤2M) and sodium ion (≤0.1M) give no critical change on the break-through properties, and T.Cap was found to be nearly constant. Break-through capacity and exchange rate increase with an increase in column temperature, while T.Cap remains constant. Thus, a similar profile was found in the curves of these properties as a function of temperature. Their inflection point gives the value of C/Co≃0.63. The decrease in flow rate (S.V) appears to give an increase in both B.T.Cap and U.
1982-03-25