Fig. 4. Changes in pH, cation adsorption, Q_cat, and anion adsorption, Q_an, upon addition of a neutral salt to "H-1" soil, obtained by solving Eq. [5] through [7], [12], and [13]. The soil was initially at C_cat = 0.1 mol_c m^-3 with initial pH = 4, 5, 6, 7, or 8. Solid lines represent Q_cat (= CEC) and Q_an (= AEC) as a function of pH when the electrolyte concentration, C, is kept constant.

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