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Chemical-Structural Changes of Organic Matter in a Semi-Arid Soil After Organic Amendment

Pedosphere 2012年第3期22卷 283-293页

作者： C.NICOLS G.MASCIANDARO T.HERNNDEZ C.GARCIA Centro de Edafología y Biología Aplicada del Segura (CEBAS-CSIC) Department of Soil and Water Conservation and Organic Wastes ManagementCampus Universitario de EspinardoP.O.160Murcia 3010 (Spain) Consiglio Nazionale delle Ricerche (CNR) Istituto per lo Studio degli Ecosistemi (ISE)-Sezione di Chimica del SuoloArea della RicercaVia Moruzzi 1Pisa 56124 (Italy)

A 9-month incubation experiment using composted and non-composted amendments derived from vine pruning waste and sewage sludge was carried out to study the effects of the nature and stability of organic amendments on the structural composition of organic matter (OM) in a semi-arid *** changes of soil OM,both in the whole soil and in the extractable carbon with pyrophosphate,were evaluated by pyrolysis-gas chromatography and chemical *** the end of the experiment,the soils amended with pruning waste exhibited less organic carbon loss than those receiving sewage *** non-composted residues increased the aliphatic-pyrolytic products of the OM,both in the whole soil and also in the pyrophosphate extract,with the products derived from peptides and proteins being significantly *** 9 months,in the soils amended with pruning waste the relative abundance of phenolic-pyrolytic products derived from phenolic compounds,lignin and proteins in the whole soil tended to increase more than those in the soils amended with sewage ***,the extractable OM with pyrophosphate in the soils amended with composted residues tended to have higher contents of these phenolic-pyrolytic products than that in non-composted ***,despite the stability of pruning waste,the composting of this material promoted the incorporation of phenolic compounds to the soil *** pyrolytic indices (furfural/pyrrole and aliphatic/aromatic ratios) showed the diminution of aliphatic compounds and the increase of aromatic compounds,indicating the stabilization of the OM in the amended soils after 9 *** conclusion,the changes of soil OM depend on the nature and stability of the organic amendments,with composted vine pruning waste favouring humification.

关键词： degraded soil pyrolysis-gas chromatography pyrophosphate extract sewage sludge vine pruning waste

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pyrolysis Study of Waterborne Polyurethane

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Journal of Wuhan University of Technology(Materials Science) 2010年第3期25卷 479-483页

作者：张燕红 School of Chemistry and Chemical Engineering South China University of Technology

The thermal degradation of synthetic waterborne polyurethane（PU） based on toluenediisocyanate（TDI） was investigated by pyrolysis-gas chromatography/mass spectrometry（Py-GC/MS） and thermogravimetry（TG）.The degradation profiles of cast films obtained from dispersions were *** than 20 characteristic volatile pyrolyzates reflecting the structure and pyrolysis mechanisms of the polymer have been identified by on-line *** helium atmosphere,the synthesized products of polyurethane were pyrolyzed at 350,450,550,650 and 750 ℃ respectively,and the thermal decomposition products were analyzed on line using GC/*** product analysis reveals that the pyrolyzates distribution of the polyurethane depends strongly on the pyrolysis *** on the Py-GC/MS data,the thermal degradation mechanism of the polyurethane is discussed.

关键词： waterborne polyurethane pyrolysis-gas chromatography mass spectrometry pyrolysis thermogravimetry

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