Effects of Solution pH on Ion Transport in Allophanic Andisol

概要

論文の詳細を見る
We per formed breakthrough experiments for an Allophanic 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 break-through 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 change 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 pH was very low due to the dispersion of the soil particles. The breakthrough curves under saturated conditions were compared with those under unsaturated conditions (-1.96 kPa of soil water potential). No significant difference was observed between them.
社団法人日本土壌肥料学会の論文