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Simultaneous Determination of Surface Area and Cation-Exchange Capacity¹

ABSTRACT

In previous work it was found that Cl repulsion by arid-zone soi's from a solution having a high and uniform concentration of Cl is closely related to surface area as measured by ethylene glycol retention. Based on this information, a measurement of Cl repulsion has been incorporated into the NaOAc method for determining cation-exchange capacity. As a result, values for surface area, as well as cation-exchange capacity, can be obtained with but little additional analytical work, except for soils high in kaolinite and sesquioxides.

¹ Contribution from the US Salinity Laboratory, SWC Res. Div., ARS, USDA, Riverside, Calif.

² Director and Chemist, respectively, US Salinity Lab., Riverside, Calif.

Received for publication March 11, 1966. Accepted for publication May 5, 1966.