Abstract
The reciprocal offects of Mg and K or Ca on the release of these cations from Bentonite and Kaolinite by relatively small amount of H were investigated, the results being as follows : (1) Mg-K relationship When both cations were present on these clays, the percent release of Mg was decreased as the increase of K/Mg ratio, the curve of decrease being relatively sharp at the first half. But Na was more effective than K in depressing the percent rel ease of Mg. On the other hand, the percent release of K was remarkably increased as the decrease of K/Mg ratio. Thus, the distinguished reciprocal effects between Mg and K were confirmed. (2) Mg-Ca relationship The percent release of Ca was not affected by the presence of Mg as complementary ion in these clays, but the presence of Ca was accompanied by a slight increase of percent release of Mg. Consequently, the reciprocal effects were insignificant.
