A method of measuring the pH‐dependent cation‐exchange capacity of soils is described and data for 15 surface soils are presented and discussed. The pH‐dependent cation‐exchange capacity was found to be equivalent to the exchange acidity not displaced by a neutral KCl solution but displaced by buffered BaCl 2 ‐triethanolamine solution. The average contribution of the organic C and clay to the pH‐dependent cation‐exchange capacity of the soil was 370 and 15.6 me. per 100 g. of the respective materials.
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P. F. Pratt (1961) studied this question.