Abstract
The influence of the water content of soil pastes on their viscosity is studied using vibrational viscometry, and the variable viscosity is explained by the structural organization of soil humic substances (HSs). The viscosity of pastes prepared from sod-podzolic soil increases to 4000–4200 mPa s with a decreasing water content of <36% and further remains almost the same. This contradicts the current views on the viscosity of suspensions, which should continuously increase with decreasing water content. This situation is explained by the fact that, in addition to water soil particles (aggregates and microaggregates), the soil paste contains one more component of supramolecular formations (SFs) from soil HSs, which could separate from soil gels and transit to disperse conditions. According to the literature data, the HS SFs are present in soils as fractal clusters (F-clusters) of particles–molecules. Because of the high stability of F-clusters, we can suggest the presence of soil particles in pastes sliding along F-clusters, whereas the change in the thickness of a sliding F-cluster layer has a minor effect on the viscosity of soil pastes. Our data on the viscosity of soil pastes confirm the significance of F-clusters for the formation of soil properties.
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Notes
The terminological difference between the supramolecular formations (SFs) and F-clusters is the absence of clear structural organization of SFs in contrast to the F-cluster; thus, the latter term is more precise.
A mechanical analogy is the movement of a subject over solid balls located on a solid surface.
REFERENCES
E. E. Bibik, Rheology of Dispersion Systems (Leningrad State Univ., Leningrad, 1981) [in Russian].
Yu. G. Frolov, Structure Formation in Disperse Systems. Rheological Properties of Structures (Moscow Inst. Chem. Technol., Moscow, 1980) [in Russian].
A. F. Tyulin, Organo-Mineral Colloids in Soil: Their Origin and Role in Root Nutrition of Higher Plants (USSR Acad. Sci., Moscow, 1958) [in Russian].
N. I. Gorbunov and L. P. Abrukova, Pochvovedenie, No. 8, 74–85 (1974).
Yu. G. Frolov, Course of Colloid Chemistry (Khimiya, Moscow, 1982) [in Russian].
S. A. Shoba, D. I. Potapov, I. V. Gorepekin, D. A. Ushkova, T. A. Gracheva, and G. N. Fedotov, Dokl. Biol. Sci. 504 (1), 78–81 (2022).
I. P. Evdokimov and A. P. Losev, Nature Nanoobjects in Oil and Gas Media (Gubkin Univ., Moscow, 2008) [in Russian].
N. Fasurova, H. Cechlovska, and J. Kucerik, Petrol. Coal 48 (2), 24–32 (2006).
J. A. Rice and J. S. Lin, Environ. Sci. Technol. 27, 413–414 (1993).
N. Senesi, F. R. Rizzi, P. Dellino, and P. Acquafredda, Soil Sci. Soc. Am. J. 60 (6), 1613–1678 (1996).
K. Mortensen, Eur. Biophys. J. 21 (3), 163–167 (1992).
N. Senesi, F. R. Rizzi, P. Dellino, and P. Acquafredda, Physicochem. Eng. Aspects 127 (1-3), 57–68 (1997).
G. N. Fedotov and G. V. Dobrovol’skii, Eurasian Soil Sci. 45 (8), 811 (2012).
E. Yu. Milanovskii, Humic Soil Substances as the Natural Hydrophobic-Hydrophylic Compounds (GEOS, Moscow, 2009) [in Russian].
Funding
This work was supported by a state contract of Moscow State University (Moscow, Russia), project no. 122011800459-3.
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Fedotov, G.N., Shoba, S.A., Ushkova, D.A. et al. Humic Substances and the Viscosity of Soil Pastes. Dokl. Earth Sc. 511, 614–617 (2023). https://doi.org/10.1134/S1028334X23600573
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DOI: https://doi.org/10.1134/S1028334X23600573