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Abstract <p>The sorption and desorption of benzo[<i>a</i>]pyrene (BaP), the most hazardous representative of PAHs (Polycyclic Aromatic Hydrocarbons), by ordinary carbonate chernozem, alluvial meadow base-saturated soil, and alluvial meadow base-saturated stratified soils sampled from different horizons were studied in a model experiment. BaP desorption is assessed using the water-soluble organic matter (WSOM) isolated from the listed soils. The Dubinin–Radushkevich model is the best to describe the adsorption isotherms as compared with the Langmuir, Freundlich, and Henry models. This suggests a predominantly multilayer nature of adsorption and volumetric filling of the micropores in the studied soils with BaP. The isotherms of BaP desorption from soils by WSOM solutions have a shape close to linear or parabolic. The maximum adsorption capacity and bond strength of sorbed BaP in humus-accumulative soil horizons are higher compared to mineral horizons and regularly decrease with the content of organic matter. The soil capacity to sorb BaP decreases in the following order: ordinary carbonate chernozem &gt; alluvial meadow base-saturated soil &gt; alluvial meadow base-saturated stratified soil. However, the degree of desorption from soil increases with a decrease in the content of organic carbon in it and an increase in the initial pollutant concentration in soil.</p>

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Sorption and Desorption of Benzo[a]pyrene by Soils of the Taganrog Bay Coastal Zone, Russia

  • 期刊论文

  • 发表日期：

    2025年5月13日

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  • T. S. Dudnikova,
  • T. M. Minkina,
  • G. K. Vasilyeva,
  • D. L. Pinsky,
  • S. N. Sushkova,
  • E. G. Shuvaev,
  • A. A. Nemtseva

摘要

Abstract

The sorption and desorption of benzo[a]pyrene (BaP), the most hazardous representative of PAHs (Polycyclic Aromatic Hydrocarbons), by ordinary carbonate chernozem, alluvial meadow base-saturated soil, and alluvial meadow base-saturated stratified soils sampled from different horizons were studied in a model experiment. BaP desorption is assessed using the water-soluble organic matter (WSOM) isolated from the listed soils. The Dubinin–Radushkevich model is the best to describe the adsorption isotherms as compared with the Langmuir, Freundlich, and Henry models. This suggests a predominantly multilayer nature of adsorption and volumetric filling of the micropores in the studied soils with BaP. The isotherms of BaP desorption from soils by WSOM solutions have a shape close to linear or parabolic. The maximum adsorption capacity and bond strength of sorbed BaP in humus-accumulative soil horizons are higher compared to mineral horizons and regularly decrease with the content of organic matter. The soil capacity to sorb BaP decreases in the following order: ordinary carbonate chernozem > alluvial meadow base-saturated soil > alluvial meadow base-saturated stratified soil. However, the degree of desorption from soil increases with a decrease in the content of organic carbon in it and an increase in the initial pollutant concentration in soil.