Abstract
A number of soils and parent rocks at different stages of weathering were investigated for the formation of heterogeneous wettability under residual hydrophobic contamination in situ. The aim of the study was to determine specific wetting contact angles of soils and parent rocks under different conditions. The wetting contact angle was measured by the captive bubble method, which implied attaching an air bubble to the specially prepared horizontal surface of a water-placed specimen with subsequent measuring the wetting contact angle according to the profile of the bubble’s photo. The soil specimens were artificially hydrophobized using media containing less than 1 wt % of oil degradation products with adapted microflora. Leached chernozem, alluvial silty loam, bentonite, dolomite–clayey marl, ornamental marl, and phyllite were studied. Based on the Pearson’s goodness-of-fit criterion, good angular data approximation by both the von Mises–Tikhonov distribution and the normal distribution was found. The dependence of the types and parameters of statistical distributions of the wetting contact angle on hydrophobization conditions of the specimens was revealed. The formation of the specimens’ hydrophobicity exclusively under introduced organic matter and incomplete water saturation conditions was found; at the same time, a high heterogeneity of wettability and hydrophobic areas at wetting contact angles above 129° was manifested. The results of the study can be useful for assessing and predicting the impact of soil hydrophobic contaminants and amendments, as well as for advancing methods for determining the wetting contact angle on the soil surface.
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Funding
This work was supported by the Russian Foundation for Basic Research, project no. 20-05-00151-a and, in part, a subsidy allocated to Kazan University for the implementation of a state assignment in the field of scientific activity (project no. 075-00216-20-05, part II, section I).
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Sofinskaya, O.A., Kosterin, A.V. & Galeev, A.A. Heterogeneity of Wetting Contact Angle in Hydrophobized Soils and Parent Rocks. Eurasian Soil Sc. 55, 339–347 (2022). https://doi.org/10.1134/S1064229322030139
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DOI: https://doi.org/10.1134/S1064229322030139