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Fig. 3. Comparison of the cation adsorption isotherms in "905" soil, obtained by solving the pH-dependence implicit Eq. [18] (solid lines) and those by simultaneously solving Eq. [5] through [7], [12], and [13] in which CEC and AEC are expressed as a function of pH and the electrolyte concentration (symbols). Dashed lines represent the isotherms obtained from Eq. [18] when the condition Ccat >> [H+] is not always fulfilled. qH = net surface charge of soil (molc kg-1).
