Abstract
For the comprehensive description of the acidity of a two-phase ion-exchange system, we should analyze two curves of the ionite titration by a strong base in water and salt solutions and find the quantitative relationships between the corresponding pH characteristics. An idea of the three-dimensional field of acidity of ion-exchange systems (the phase space of the soil acidity characteristics) and its three two-dimensional projections is suggested. For soils, three interrelated characteristics—the pH values of the salt and water extracts and the degree of base saturation—can serve as spatial coordinates for the acidity field. Representation of factual data in this field makes it possible to compare and analyze the acidity characteristics of different soils and soil horizons and to determine their specific features. Differentiation of the field into separate volumes allows one to present the data in a discrete form. We have studied the distribution patterns of the groups of soil horizons from Leningrad oblast and other regions of northwestern Russia in the acidity field. The studied samples are grouped in different partially overlapping areas of the projections of the acidity field. The results of this grouping attest to the correctness of the modern classification of Russian soils. A notion of the characteristic soil area in the acidity field is suggested; it can be applied to all the soils with a leaching soil water regime.
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Original Russian Text © Yu.A. Kokotov, E.Yu. Sukhacheva, B.F. Aparin, 2014, published in Pochvovedenie, 2014, No. 12, pp. 1448–1459.
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Kokotov, Y.A., Sukhacheva, E.Y. & Aparin, B.F. Acidity field of soils as ion-exchange systems and the diagnostics of genetic soil horizons. Eurasian Soil Sc. 47, 1227–1237 (2014). https://doi.org/10.1134/S1064229314120072
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DOI: https://doi.org/10.1134/S1064229314120072