Inna Igorevna Tolpeshta
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The content of benzoic acid in a podzolic soil and the sorption on montmorilloniteMoscow University Bulletin. Series 17. Soil science. 2022. 1. p.34-41Tatyana A. Sokolova Inna I. Tolpeshta Elizaveta I. Karavanova Yulia G. Izosimova Yulia A. Zavgorodnaya Nikita Al. Kotelnikovread more640
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The content of benzoic acid in the water extract from the organic horizons of the podzolic soil was found to be 3,27 and 1,83 ppm in the horizons L and F, respectively, and it decreases to hundredths of ppm in the mineral horizons. It was established in an experiment, that with an increase in the benzoic acid equilibrium concentration of from 0,02 to 1,45 mmol/L, its sorption onto Ca-montmorillonite increases from 5,61 to 15,34 mmol/kg. Taking into account the content and mineralogical composition of the clay fraction, the expandable clays in the upper mineral horizons of the podzolic soil are capable to retain from 0,06 to 0,15 mmol of benzoic acid per 1 kg of soil within the same range of equilibrium concentrations. The linear equation and the Freundlich model provide the best fit to the measured data. It is assumed that, under experimental conditions, the main mechanisms of benzoic acid sorption were the cation bridging or water bridging and the electrostatic interaction of benzoate with positively charged silanol and aluminol groups on edges of montmorillonite particles. The absorption of benzoic acid in the interlayer space of the mineral wasn’t observed.Keywords: low molecular weight organic acids (LMWA); organo-mineral interactions; minerals; Retisols
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Studies of oil- contaminated soils and forward-looking approaches to their remediatioMoscow University Bulletin. Series 17. Soil science. 2023. 4. p.83-93read more553
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Milestones in the study of oil-contaminated soils at the Faculty of Soil Science for 50 years of its foundation are dis- cussed from the prospects for the development of environmental regulation and new technologies of soil reclamation. The development of a methodological framework for the determination of oil and petroleum hydrocarbons in soils, studies of soil properties, the chemistry of oil and its components in soil and adjacent media are shown. The devel- opment of legislation on the rationing of petroleum hydrocarbons in soils is given, including the important role of the staff of Faculty of Soil Science of Moscow State University in the work out of a number of regional standards for the permissible residual content of petroleum hydrocarbons in soils is noted. The approaches to ecological rationing of oil and petroleum hydrocarbons in soils are proposed, in the aspects of natural climatic zones and the type of landuse. The importance of improving the regulatory and methodological framework and continuing work in this direction is emphasized. The necessity of research at developing technologies for reclamation of oil-contaminated lands and special use of oil-contaminated waste is indicated.
Keywords: soils; oil and petroleum hydrocarbons; rationing; reclamation; remediants; technologies
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