Study Into the Changes in Soil Organic Matter, Caused By Laboratory Simulated Fires in Four Slovak Soils 1. UV-VIS Spectrum Analysis

This study evaluates the sorption kinetics and adsorption isotherms of copper ions (Cu2+) onto soil amended with biochar and natural zeolite. Biochar was produced from beech wood at pyrolysis temperatures of 400 °C and 500 °C, while clinoptilolite zeolite was used as a natural mineral sorbent. Sorption experiments assessed the efficiency and behaviour of Cu2+ uptake, with data fitted to linear, Freundlich, and Langmuir isotherm models. The results showed that biochar produced at 400 °C had the highest adsorption capacity, with a maximum value Smax of 172.58 mg/g, followed by zeolite at 162.52 mg/g and biochar at 500 °C with 158.86 mg/g. All sorbents exhibited strong linear adsorption behaviour, with correlation coefficients near or above 0.999, suggesting a uniform adsorption affinity. These findings demonstrate the effectiveness of biochar and zeolite as sustainable options for Cu2+ removal from contaminated soils, providing insights into optimising sorbent selection and pyrolysis conditions for environmental remediation.

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Characteristics of humic acids isolated from burned and unburned topsoils in sub-boreal Scotch pine forests by 13C-NMR spectroscopy

Chebykina¹,

Abakumov²

2022

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Postpyrogenic soil dynamics is an informative tool for studying soil elementary processes in extreme temperature conditions and for predicting short time environmental changes in conditions of catastrophic landscape changes. Soil organic matter (SOM) system evolution is the most rapid process of postpyrogenic soil development. In this relation, the focus on humus structure is important for understanding these important dynamics. Soil restoration after spontaneous forest fires near Togljatty City (Samara Region, Russia) was abandoned in 2010 and further monitoring over the next ten years was organised to evaluate the speed of humus accumulation dynamics. The aim of this study was to apply the 13C-NMR (nuclear magnetic resonance) spectroscopy to analyse the effect of forest fires on SOM degradation in Scotch pine forests on Psamment Entisols of the fragmented steppe in the Samara Region. Three key soil plots were studied for estimating SOM quality changes under the forest fire effect: surface forest fire, crown forest fire and control, i.e. 18 soil samples of top soil horizons were analysed in three replicates. The data obtained indicate that the humus molecular composition was substantially affected by the wildfires. Investigation of the humic acids’ (HAs) molecular structure by 13C-NMR showed a relative increase in aromatic compounds and decrease in aliphatic ones. The aromaticity degree of HA molecules increases in 5.7 and 3.8 times in cases of surface and crown forest fires, correspondingly. In general, crown and surface fires plots are not very different in terms of 13C-NMR spectra of HAs (p = 0.34); however, HAs of control plot have essential differences from pyrogenic ones (p < 0.05). 13C NMR spectra have shown a change in the proportion of oxygen-containing functional groups as well. One of the most important effects observed in wildfire-affected SOM is that the proportion of lignin-like structures increases as a concomitant effect of depletion of C,H-alkyl groups, especially in the case of crown fires.

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Study Into the Changes in Soil Organic Matter, Caused By Laboratory Simulated Fires in Four Slovak Soils 1. UV-VIS Spectrum Analysis

Cited by 3 publications

References 11 publications

Humic substances sorption from wastewater on the biochar produced from the waste materials

Humic substances sorption from wastewater on the biochar produced from the waste materials

Sorption Kinetics of Copper Ions on Biochar and Zeolite

Characteristics of humic acids isolated from burned and unburned topsoils in sub-boreal Scotch pine forests by 13C-NMR spectroscopy

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