| 土壤中离子扩散的动力学研究 |
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| 引用本文： | 李航,薛家骅.土壤中离子扩散的动力学研究[J].土壤学报,1996,33(4):327-336. |
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| 作者姓名： | 李航 薛家骅 |
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| 作者单位： | [1]西南农业大学资源环境学院 [2]南京农业大学基础部 |
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| 摘 要： | 本文首先从理论上分析了土壤中离子扩散的动力学问题，提出了土壤中离子扩散的三种动力学类型，即扩散的一级动力学、零级动力学和负一极动力学，并且还指出，一级动力学是土壤中离子扩散的普遍形式，负一级动力学只出现在过程的初期阶段，而扩散的零级动力学则存在于有快速表面反应的情况下。在此基础上进行了Ｍｇ＾２＋在土壤和石英砂中的扩散动力学实验研究，结果发现不论在２９８Ｋ还是在３０８Ｋ的温度下，两个体系中Ｍｇ＾２＋
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| 关 键 词： | 土壤 离子扩散 动力学 |
| 收稿时间： | 1995/10/15 0:00:00 |
STUDY ON ION DIFFUSION KINETICS IN SOIL SYSTEMS |
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| Li Hang and Xue Jiahua.STUDY ON ION DIFFUSION KINETICS IN SOIL SYSTEMS[J].Acta Pedologica Sinica,1996,33(4):327-336. |
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| Authors: | Li Hang and Xue Jiahua |
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| Institution: | College of Resources and Environment, Southwest Agricultural University, Chongqing 630716;Basic Course Department, Nanjing Agricultural University, Nanjing |
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| Abstract: | First, this paper discusses ion diffusion kinetics in soil systems theoritically. Ion diffusion kinetics in soils can be classified into three types: negative first-order, zero-order and first-order kinetics. Based on this, an experiment on Mg2+ diffusion kinetics was done in soil and quartz sand systems. The results showed that Mg2+ diffusion kinetics in the two systems were a first-order kinetic process. But at the temperature of 298K and in the initial stage of diffusion, first-order and negative first-order kinetic processes coexisted in Mg2+ diffusion in the soil system. Through the study of Mg2+ diffusion in quartz sand systems, we also found that an exchange reaction might take place between Mg2+ and hydrogen at the hydration SiO2 surface, and the Mg2+ which took part in exchange reaction was at diffused in the quartz sand within the initial ten minutes. |
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| Keywords: | Soil Ion diffusion Kinetics |
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