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Double-shot pyrolysis-GC-MS direct analysis of complex environmental matrices

AuthorsGonzález-Vila, Francisco Javier ; Verdejo Robles, Trinidad ; González-Pérez, José Antonio ; Rosa Arranz, José M. de la ; González-Vázquez, Rocío ; Polvillo, Oliva ; Terán Rodríguez, A.
Issue Date2007
PublisherUniversidad de Granada
CitationI Workshop of the Spanish Society of Mass Spectrometry: VII Scientific Meeting of the Spanish Society of Chromatography and related techniques (Actas) Póster 15 pág. 155 (2007)
AbstractAnalysis of pyrolysis (Py) products by gas chromatography-mass spectrometry (GCMS) enables insight into the molecular structure of polymers and natural macromolecules. In general terms, most of pyrolytic fragments are diagnostic compounds in which the structure of the main building blocks is preserved. The technique has been also found suitable lo direct characterize complex environmental matrices, such as compost, biomass, soils and sediments. The thermolytie behavior of these materials primarily depends of the chemical composition of their pyrolizable organic moieties, and also on specific pyrolysis conditions (e.g. temperature, heating rate, particle size, etc.). Nowadays, the search of the best mild pyrolytic conditions lo analyse complex materials which could prevent the biased information derived from the appearance of secondary rearrangement products or degradation products at high temperature is considered a key point of analytical research. Recently, the double-shot pyrolysis technique which combines thermal desorption with conventional pyrolysis in combination with gas chromatography and mass spectrometry is acquiring high importance for the analysis of complex molecules. The present study deals with the thermal degradation behavior of complex environmental matrices using sub-pyrolysis temperatures, double-shot pyrolysis and flash pyrolysis. Materials analysed included Brazilian Oxisols under different vegetation covers, forest fire affected soils and marine sediments. To investigate the thermal released products of these matrices different pyrolysis experiments were performed: a gradient of sub-pyrolysis temperatures (200, 250, 300 and 350 ºC), double-shot pyrolysis at 450 or 500 ºC after a pre-pyrolysis step at 250 'C and straight flash pyrolysis at 500 ºC.
DescriptionPóster presentado en the Workshop of the Spanish Society of Mass Spectrometry: VII Scientific Meeting of the Spanish Society of Chromatography and related techniques 16-19 octubre (2007) Granada
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