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Adsorption of Water Vapor by Soils: Investigations of the Influence of Organic Matter, Iron, and Aluminum on Energetic Heterogeneity of Soil Clays

Published online by Cambridge University Press:  28 February 2024

Z. Sokołowska ,
G. Jòzefaciuk ,
S. Sokołowski  and
A. Ourumova-Pesheva
Z. Sokołowska
Affiliation:
Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20036 Lublin, Poland
G. Jòzefaciuk
Affiliation:
Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20036 Lublin, Poland
S. Sokołowski*
Affiliation:
Institut für Fluid- und Thermodynamik, Ruhr-Universität Bochum, 4630 Bochum 1, West Germany Nowotki 12, 20031 Lublin, Poland
A. Ourumova-Pesheva
Affiliation:
Institute of Soil Science and Agroecology, Schosse Bankya 5, 1008 Sofia, Bulgaria
*
*Alexander von Humboldt Fellow, permanent address: Faculty of Chemistry, Maria Curie-Sklodowska University, 20031 Lublin, Poland
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Abstract

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Water vapor adsorption isotherms were measured for samples of loessial soil clays modified by removing organic matter and Fe and Al compounds. The isotherms were analyzed by the exponential adsorption isotherm equation. The distribution functions of adsorption energy, average adsorption energies, and surface areas were evaluated simultaneously. The surface areas were the highest for samples after organic matter removal and the lowest when all considered components were removed. Values of the average adsorption energies decreased consecutively after each of the subsequent removal steps while the energy distributions became narrower, indicating in general less variety in surface adsorbing centers.

Keywords

Soil constituentsSurface heterogeneityWater adsorption
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 3 , June 1993 , pp. 346 - 352
Copyright
Copyright © 1993, The Clay Minerals Society

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