可变电荷及恒电荷土壤与H^+反应的动态监测

Dynamic monitoring of reactions between variable and constant charge soils with H^+

动态监测了恒电荷及可变电荷土壤与H+反应的动力学过程,并进行了数学描述.结果表明,质子化过程为一相当快的过程,当氧化铁含量高时,质子化作用将消耗大量的H+.反应5s后,H+浓度随时间的变化可分为快速和慢速两个阶段.输入的H+浓度低时,质子化是矿物消耗H+最主要的机制;输入的H+浓度高时,除质子化作用外,矿物的溶解也是消耗H+的重要机制.就矿物本身消耗H+的能力而言,可变电荷土壤的消耗能力大于恒电荷土壤.

The kinetic processes of reactions between variable and constant charge soils with H+ were monitored dynamically and described mathematically. The results show that protonation is a rather rapid process. When the amount of ferric oxides is high, the protonation can consume a large amount of H+. After 5s of reaction, the change of H+ concentration with time may be divided into rapid and slow stages. When the inputs of H+ concentration are low, protonation is the main mechanism for consumption of H+ by mineral. In the case of high inputs, besides protonation, mineral dissolution is also an important mechanism for consumption of H+. Regarding the mineral per se, its ability to consume H+ is larger for variable than for constant charge soil.