ゼオライトのカチオン吸着特性と CEC 測定上の問題点

概要

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In recent years zeolite has been used as an amending material for arable soils because of its large cation exchange capacity. Thus, the cation adsorptive characteristics and the method of CEC determination were investigated. The sample used was a pulverized zeolite rock of tuffaceous origin occured in Itaya, Yamagata Prefecture, and was composed mainly of clinoptilolite. The zeolite was saturated with NH_4^+ by treating with ammonium acetate, and the adsorbed NH*+ was extracted by centrifugal technique with KCl, NaCl, CaCl_2, AlCl_3 or acetic acid solutions. Although KCl solution extracted all of the adsorbed NH_4^+ with four extraction treatments, the other solution, especially CaCl_2,. AlCl_3 and acetic acid, were inferior in the extrction of NH_4^+ to KCl. For example, even afted thirteen extraction treatments with CaCl_2, 17% of the adsorbed NH_4^+ was still remained in the exchange site. It was noticed from the results that either NH_4^+ or K^+ should be used to saturating and extracting cations in the CEC determination of zeolite.
日本粘土学会の論文
1971-03-05