Thermal analysis of organic matter in cryogenic soils (Central Siberian Plateau) |
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| Authors: | O A Shapchenkova A A Aniskina S R Loskutov |
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| Institution: | 1.Sukachev Institute of Forestry, Siberian Branch,Russian Academy of Sciences,Krasnoyarsk,Russia |
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| Abstract: | The thermal degradation of organic matter was studied in cryogenic soils with methods of thermal analysis: differential scanning
calorimetry and thermogravimetry (DSC and TG, respectively). The DSC curves of most of the samples within the temperature
range from 221–247°C to 600°C were characterized by the presence of one wide exothermic peak (at 311–373°C) with a shoulder
(or without it) on the descending branch at a temperature of about 400°C. This was connected mostly with the destruction of
thermolabile compounds (oligo- and polysaccharides) and with the oxidation of low-aromatic complexes of plant residues and
humus substances. Two exothermic peaks at 337–373°C and 448–492°C were found for some samples from the organic horizons. The
high-temperature peaks were caused by the thermal destruction of lignin. The fraction of the thermolabile organic matter of
the soil (237–261…331–377°C) reached 59–73% in the organic and 52–59% in the organomineral and mineral horizons. |
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