Soil organic matter (SOM) is an ubiquitous, complex material which is produced by the degradation of plant tissuesand animal bodies. It is the major indicator of soil quality since it is directly involved in the maintenance ofsoil fertility, prevention of erosion and desert encroachment and provision of suitable environment for biologicalactivity. Organic matter is an important driving force in environmental global change as it acts as both a source andsink of atmospheric carbon. However, SOM is subjected to rapid changes due to environmental transformationssuch as massive deforestations, fires, intensive land uses, temperature increases and so on.In the present work, a characterization of humic substances was done in order to obtain information about the transformationoccurring to SOM as affected by temperature increases. For the first time variable temperature crosspolarization magic angle spinning (CPMAS) 13C NMR spectroscopy was applied in combination with thermalanalyses (TG and DSC) on environmentally relevant soil organic matter. The results show that the conformationalchanges occurring in humic substances as temperature is raised can be associated to melting of alkyl componentsconnected with sublimation of some organic compounds. The simultaneous application of solid phase micro extractionGC-MS also allowed the identification of the components which were released by sublimation processes.
|Numero di pagine||0|
|Stato di pubblicazione||Published - 2009|