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Micro-Determination of Cation-Exchange Capacity by Neutron Activation Analysis¹

ABSTRACT

Neutron activation analysis was evaluated as a method to determine the cation-exchange capacity (CEC) of clay samples. Cation-exchange capacity values of satisfactory reproducibility and accuracy were obtained on 5- to 50-mg subsamples of kaolinite and montmorillonite clays previously saturated with Na, Rb, or Cs. use of Cs as the index ion provided the simplest and most flexible conditions for the activation analysis method.

¹ Technical Paper no. 3267, Oregon Agr. Exp. Sta., Corvallis. Financial support through Atomic Energy Commission Grant AT(45-1)-2062 is gratefully acknowledged.

² Former Research Assistant, Dep. of Soil Science, Oregon State Univ. Author now Postdoctoral Fellow, Dep. of Soil Science, Univ. of Alberta, Edmonton, Canada.

Received for publication February 16, 1973. Accepted for publication May 8, 1973.