SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 18:365-368 (1954)
© 1954 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Comparison of Ammonium Acetate, Barium Acetate, and Buffered Barium Chloride Methods of Determining Cation Exchange Capacity1

P. F. Pratt and N. Holowaychuk2

ABSTRACT

The cation exchange capacities of several profile samples of soils were determined using three different methods. Total exchangeable cations were determined and used as a criterion for evaluating the different methods of determining the exchange capacity. For all soil samples the NH4OAc method underestimated the exchange capacity and so produced distorted exchange capacity profiles. The Ba(OAc)2 method gave exchange capacity values which were equal to the sum of exchangeable cations, except with highly acid soils where it gave low values. The BaCl2-buffer exchange capacity gave values that were nearly equal to the sum of the exchangeable cations for all samples tested. The Ba(OAc)2 or BaCl2-buffer methods, in which Ba is replaced by 0.05 N HCl and the Ba determined using an acetylene flame with a model 52 C Perkin-Elmer photometer, cannot be used for some samples because of Ca interference. Some slightly acid soils gave sufficient Ca release during the HCl extraction to interfere in the Ba determination. This interference was removed by washing the soil with HCl before leaching with the BaCl2-buffer and by replacing the barium with NH4OAc.

NOTES

1 Contribution from the Department of Agronomy, Ohio Agr. Exp. Sta., Project State 106, Journal paper number 1–54. Presented before Div. II. Soil Science Society of America, Dallas, Tex., Nov. 18, 1953.

2 Assistant Professor and Associate Professor, respectively, of the Ohio Agr. Exp. Sta. and The Ohio State University.

Received for publication January 16, 1954.




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