Cation‐exchange capacity has been measured by isotopic exchange of 133Ba with Ba2+‐saturated soils and clays in 2·5 × 10−3 M‐BaCl2 suspensions. The rate of isotopic dilution, the efficiency of displacement of soil cations by Ba2+, and the precision of the method are critically assessed. The method is reliable and convenient, and can be used with both buffered and unbuffered systems.
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Bryon W. Bache (1970) studied this question.