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当前位置: 首页 > 文章 > 可变电荷土壤表面酸碱模型及其计算机模拟 土壤学报 1992,29 (2) 183-190
Position: Home > Articles > SURFACE ACID-BASE MODEL OF VARIABLE CHARGE SOILS AND COMPUTER MODELLING OF SOIL ACID-BASE TITRATION CURVES Acta Pedologica Sinica 1992,29 (2) 183-190

可变电荷土壤表面酸碱模型及其计算机模拟

作  者：
胡国松
单  位：
中国科学院南京土壤研究所
关键词：
模型;酸碱滴定;计算机模拟
摘  要：
在假定土壤对酸碱的缓冲作用全由表面基团反应所控制的基础上,建立了一个描述可变电荷土壤酸碱滴定曲线的模型,并在计算机上对实验结果进行了模拟。结果表明,本模型可以较好地描述土壤酸碱滴定曲线,提供土壤的酸强度(K_a)和酸容量(S_t),并可进一步提供土壤的酸缓冲容量曲线。本模型对了解和认识土壤酸化和吸附等过程具有一定的意义。
译  名：
SURFACE ACID-BASE MODEL OF VARIABLE CHARGE SOILS AND COMPUTER MODELLING OF SOIL ACID-BASE TITRATION CURVES
作  者：
Hu Guosong (Institute of Soil Science, Academia Sinica, Nanjing, 210008)
关键词：
Soil surface, Soil acidbase Titration curve, Model, Computer modelling
摘  要：
Soil surface acidity, as one of the most important characteristics of soil solids, is very closely related with adsorption, floculation and other interface phenomena, and acid-base titration curve technique is widely used to describe the acidity. A model to describe the acidbase titration curves of variable charge soils was established on the assumption that all the H~+ or OH~- added into soils were buffered by soil surface groups M—OH~(+(1/2)_2, M—OH~(-(1/2)), and M—O~(-(3/5)) and equations concerning the relationship between equalibrium suspension pH and amount of acid or base added were derived according to the principle of mass balance and charge balance. The acid and base titration curves and buffering curves were modelled using the model on computer and the results showed that Ka_1 has great effect on both acid and base titration curves, but Ka_2 inflenced the base titration curves only with no effect on acid titration curves. The model could well describe the acid titration curves of 3 variable charge soils. The model could provide soil acid intensity (Ka_1 and Ka_2), soil acid capacity (St), buffering capacity pH of soil acid and base at different pH, and greatest buffring capacity pH of soil. The acid capacity (St) was mainly determined by the content of soil clays and soil special surface, the acid intensity was mainly determined by the content of iron oxide. Buffering capacity of soils to acid and base was correspondance with Ka_1 and Ka_2. The experimental results of acid titration of 3 variable charge soils, red soil, lateritic red soil and latosol, could fitted well with the model. The model will be helpful in understanding the acidification mechanism, adsorption process and other surface processes.

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