天然ゼオライトの簡易塩基交換容量測定法
1980 年 20 巻 3 号 p. 78-82
詳細
1980 年 20 巻 3 号 p. 78-82
A new simple method for determining the cation exchange capacity of natural zeolites is presented. The natural zeolites used in this study were from Shimane Prefecture, Japan.
The most suitable measuring conditions of this method were obtained for the natural clinoptilolite, the natural mordenite, Na+ exchanged clinoptilolite and mordenite, and Mg2+ exchanged mordenite. As the result, the natural clinoptilolite was saturated with NH+4 ions for about a month at room temperature by treating with 100 ml of 1 N AcONH4solution, but for only one day at 80°C. And the all NFI+4 ions adsorbed in the natural clinoptilolite were extracted for about one hour by treating with 100 ml of 10% KCl solution.
The CEC value of the natural clinoptilolite obtained by the Schollenberger's method was smaller than that obtained by the method presented in this report. Then the exchange rate of each cation with NH+4 for the natural clinoptilolite was investigated, and it was found that exchangeable Ca2+ and Mg2+ (especially Mg2+) ions contained in the natural clinoptilolite were exchanged with NH+4 ions very slowly at room temperature.
