Abstract
The unreclaimed dumps of the Moscow coal basin are a long-term spontaneous experiment reflecting the transformation of soils and toxic technogenic material under the influence of acid mine drainage with compounds of heavy metals and metalloids. In the Tula region, the particle size distribution, pH value, the electrical conductivity of a water extract, the concentration of total organic carbon and three mobile fractions, as well as the total content of Al, Ca, Fe, Mn, and S were obtained to analyze the transformation of the fractional composition of compounds of six elements in the soils of sulfuric acid geocomplexes at 11 key sites (a total of 57 samples). Heavy loamy chernozems that were not exposed to the waste heap contain up to 9% total organic carbon, have a near-neutral environment, and low electrical conductivity. In these, the average mobility of elements (in %) decreases in the series: Ca (62) > Mn (35) > Al, Fe (14) > S (3). Among the mobile compounds of Ca, exchangeable ones predominate, while Al, Fe, and Mn are extractable in 1 N HNO3 at close levels of the S concentration of the three studied mobile fractions. Medium-heavy loamy toxylithostrats of the bare surface of the waste heap with a predominantly very acidic environment often have sulfate salinity. In these, the average mobility of elements decreases in the series Ca (80) > Fe (36) > S (15) > Al, Mn (3). Among the mobile compounds of Ca, Mn, and S, exchangeable compounds predominate, that is, Al and Fe, extracted with 1 N HNO3. Acid mine drainage and solid matter from the waste heap form toeslope talus that bury highly productive chernozems. In terms of the fractional composition of the Al, Ca, Fe, Mg, Mn, and S compounds, the bare soils of the talus are close to the toxic substrates of the waste heap and the grass-covered soils of the toeslope talus are close to the background chernozems. Relative to the waste heap material, the content of mobile compounds and total Ca and S is reduced in the displaced substrate from toeslope talus. Presumably, due to the influence of vegetation in the grass-covered substrate, the contents of mobile Mn compounds and the mobility of Al are significantly increased, while due to the lower supply of substances from the body of the waste heap, the mobility of Fe is reduced. The AUx horizon of chernozems has increases in the content of mobile compounds and total S, as well as water-soluble Ca2+ and Mg2+ with a decrease in the content of mobile compounds and total Mn.
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Notes
Latin names of plants are given according to the work of S.K. Cherepanov (1995).
The given numbering of groups is preserved in the illustrative material of the article.
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ACKNOWLEDGMENTS
The authors are grateful to P.P. Krechetov for discussion of the interim results of the study, B.A. Ibragimova for help in performing quantitative chemical analysis, E.S. Starchikova and N.A. Yudina for sample preparation and water extract, L.V. Dobrydneva (Moscow State University) for the chromatographic analysis of the aqueous extract, A.I. Yakushev (IGEM RAS) for the X-ray fluorescence analysis, V.K. Karandashev (IPTM RAS) for elemental analysis of extracts. When selecting research objects, materials were provided by the Center for Collective Use Geoportal (Moscow State University).
Funding
The study was carried out within the RFBR project no. 20-35-70 066 (field and chemical-analytical work) and supported by the Interdisciplinary Scientific and Educational School of the Moscow State University The future of the planet and global changes in the environment (interpretation of the results).
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Conflict of interest. The authors declare that they have no conflicts of interest.Statement on the welfare of animals. This article does not contain any studies involving animals performed by any of the authors.
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Semenkov, I.N., Sharapova, A.V., Lednev, S.A. et al. The Fractional Composition of Compounds of Metals and Sulfur in the Upper Layer of Soils of the Impact Zones of a Coal Mine (Central Russian Forest-Steppe). Arid Ecosyst 13, 224–231 (2023). https://doi.org/10.1134/S2079096123020130
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DOI: https://doi.org/10.1134/S2079096123020130