Fig. 6. Comparison of the cation adsorption isotherms in "H-1" soil, obtained by solving Eq. [18] (solid lines) and those by solving Eq. [5] through [7], [12], and [13] simultaneously (symbols). Dashed lines represent the isotherms obtained from Eq. [18] when the condition C_cat >> [H⁺] is not always fulfilled. q_H = net surface charge of soil (mol_c kg^-1).

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