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黄土之工程性质与其矿物成分密切相关。由于阳离子交换容量为表征土的矿物组成之重要指标，因此确定黄土阳离子交换容量之组成与性质是应用该指标来研究黄土工程性质之前提。本文从物理化学角度，推导了比以单一Ｇｏｕｙ模式为基础更为合理的以Ｓｔｅｒｎ—Ｇｏｕｙ双电层模式为基础的阳离子交换容量的理论公式，进而深入讨论了黄土阳离子交换容量的组成和粘粒成分、介质ｐＨ值以及双电层平衡电荷浓度和价数之影响，为该指标在黄土的本质及性状研究中的应用提供了理论基础。
The engineering properties of loess are closely related to its mineral composition. Since the cation exchange capacity is an important index to characterize the mineral composition of the soil, determining the composition and properties of the cation exchange capacity of the loess is applied to the study of the loess engineering properties. In this paper, from the view of physical chemistry, the theoretical formula of cation exchange capacity based on the Stern-Gouy electric double layer model is more reasonable than that based on a single Gouy model, and then the composition of the cation exchange capacity of the loess and the clay particles are further discussed. The effects of the composition, medium pH, and equilibrium electric charge concentration and valence of the electric double layer provide a theoretical basis for the application of this indicator in the study of the nature and properties of loess.