Content of adsorbed film water and density of oxygen-containing functional groups on surface of ageing biochar in sandy spodosol


Authors: Eugene Balashov, Yury Khomyakov, Sofia Sushko and Elena Rizhiya

Volume/Issue: Volume 25: Issue 2

Published online: 01 Nov 2022

Pages: 115 - 120



Application of diff erent types of feedstocks and conditions of their pyrolysis can result in diff erent properties and sustainability of biochar during changes (aging) of its properties in soils. The aim of the studies was to assess the consequences of aging of biochar in soil for a content of adsorbed fi lm water and a density of oxygen-containing functional groups on its surface. Sampling of soil and biochar was conducted in May and July of 2021 in a plot experiment with an applied rate of biochar of 20 t.ha-1 in 2016. WP4-T dew point potentiometer was used for measurements of relationships of potentials of adsorbed fi lm water and its content in soil and biochar. Infrared Fourier FSM 2201/2202 spectrometer was applied for determination of densities of oxygen-containing functional groups on surface of biochar in a mid-infrared spectrum. Results showed that retention capacity of adsorbed fi lm water by soil increased from May to July, possibly because of increasing content of hydrophilic organic compounds of plant origin. Aging of biochar in soil also resulted in an increase of retention capacity of adsorbed fi lm water on its surface. The results of infrared Fourier spectroscopy confi rmed that densities of oxygen-containing functional groups on the surface of biochar increased from May to July at spectra of wavenumbers of 1,600–1,400 cm-1 and 1,400–1,100 cm-1.

Keywords: soil, biochar, aging, fi lm water, oxygen-containing functional groups



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