430 CATION EXCHANGE CAPACITY
Physio Chem: CEC
Cation Exchange Capacity by barium acetate saturation and calcium replacement.
Summary: The method determines the cation exchange capacity (CEC) of soil. The soil is quantitatively displaced of all exchangeable cations with barium, followed by four deionized water rinses to remove excess barium. A known quantity of calcium is then exchanged for barium and excess solution calcium is measured. CEC is determined by the difference in the quantity of the calcium added and the amount found in the resulting solution. The method has a detection limit of approximately 2.0 meq/100g.
Rible, J. M. and Quick, J. 1960. Method S-19.0. In: Water soil plant tissue. Tentative methods of analysis for diagnostic purposes. Davis,