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应用砖红壤、红壤、黄棕壤和两种粘土矿物,根据用玻璃电极所测得的离子活度计算了土壤对钠和钾离子的结合能,结果发现:1.当悬液中的离子数量相等时,固相的电荷愈多,结合能愈大。2.当保持固相的电荷量相等时,离子量愈少,则结合能愈大。3.无论是可变电荷的比例很大的砖红壤,还是可变电荷的比例很小的膨润土或不含可变电荷的强酸型阳离子交换树脂,pH 对结合能都有强烈的影响。作者根据实验材料认为,土壤体系中局部的电场强度较整个体系的平均体积电荷密度在决定离子的结合能方面具有更大意义;在 pH 低时,氢铝离子对交换点的竞争是钾、钠离子的结合能减小的一个重要原因.
Using red brick, red soil, yellow brown soil and two clay minerals, the binding energies of soil to sodium and potassium ions were calculated based on the measured ion activity of the glass electrode. The results were as follows: 1. When the amount of ions Equal, the more the charge of the solid phase, the greater the binding energy. 2. When the amount of charge to maintain a solid phase is equal, the smaller the amount of ions, the greater the binding energy. 3. Whether it is brick red soil with a large proportion of variable charge or bentonite with a small amount of variable charge or strong acid type cation exchange resin without variable charge, the pH has a strong influence on the binding energy. According to the experimental data, the authors believe that the local electric field strength in the soil system is more significant than the average volume charge density of the whole system in determining the binding energy of the ions. At low pH, the competition between aluminum and aluminum for the exchange sites is potassium, sodium Ion binding can reduce an important reason.