Abstract
Abstract We performed breakthrough experiments for an Ailophanic Andisol under saturated and unsaturated conditions. The experiments were carried out under several different pH conditions. The AEC and the CEC of anAllophanic Andisol under different pH conditions were measured using the batch method of Wada and Okamura. The values were compared with those obtained in the breakthrough experiments. No significant difference was observed between them. The results indicated that there was an adequate exchange of counterions during the movement through the soil in the breakthrough experiments. The breakthrough curves showed the effects of the solution pH on the ion transport in soil. The pH affected the charge density and the charge density significantly influenced the movement of counterions in the soil. Another effect of the pH on ion transport was observed in the breakthrough curves as a function of “apparent pore volume.” The pH also affected the hydraulic conductivity. The hydraulic conductivity at a low p...
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