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A New Equilibration Method for Cation-Exchange Capacity Measurement¹

ABSTRACT

A method is proposed for the measurement of cation-exchange capacity (CEC) of leached soils carrying both variable and constant negative charges at conditions pertinent to the field. The method consists of equilibrating a soil with 0.01 M SrCl₂ (five centrifuge washings), replacing the retained Sr with 0.5 M HCl (one centrifuge washing) and determining the replaced Sr by atomic absorption spectrophotometry. The equilibrium pH is measured with the final 0.01 M SrCl₂ washing. If desired, exchangeable bases and Al can be determined by collecting the 0.01 M SrCl₂ washings. This method was developed because we found that the Gillman's BaCl₂-MgSO₄ CEC method has problems due to specific adsorption of SO^2–₄. For evaluation, the CEC obtained by the proposed method was compared with the sum of exchangeable bases and Al and with the CEC obtained by other methods including saturation-equilibration with 1 M SrCl₂-0.01 M SrCl₂ and 1 M NH₄OAc-0.05 M NH₄OAc (pH 7.0), respectively.

¹ Contribution from the Faculty of Agriculture, Kyushu Univ., Fukuoka 812, Japan.

² Graduate Student and Professor, Dep. of Agric. Chem., Kyushu Univ., Fukuoka, Japan, respectively.

Received for publication June 15, 1984. Accepted for publication November 30, 1984.