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Title

Chemical structure of a soil humic acid as revealed by analytical pyrolisis

AuthorsSáiz-Jiménez, Cesáreo ; Leeuw, J. W. de
KeywordsBiopolymers; ; humic acids; mass spectrometry; pyrolysis; soils
Gas chromatography
Humic acids
Mass spectrometry
Pyrolysis
Soils
Issue Date1988
PublisherTechnische Universiteit Delft
CitationOrigin and chemical nature of soil organic matter: 103-112 (1988)
AbstractA humic acid isolated from a brown soil (Typic Xerochrept) was characterized by analytical pyrolysis and chemical degradation reactions. On Curie-point pyrolysis at 610 °C the humic acid yielded pyrolysis products from polysaccharides, proteins and lignins. Fatty acids and aliphatic hydrocarbons were also released. Acid hydrolysis or persulphate oxidation of the humic acid released polysaccharides, proteins and to some extent lignins and fatty acids, leaving a residue that amounted to ca. 25-30% of the initial weight. Pyrolysis of the humic acid residues \indicated the abundant presence of homologous series of w-alkanes, n-alk-1-enes and a.w-alkadienes. The data suggest that lignin is not a significant contributor to the most resistant part of the humic acid. Other plant components, mainly highly aliphatic biopolymers encountered in plant cuticles and suberin, are probably a significant and resistant part of humic acids.
Description10 pages, 5 figures, 3 tables, 15 references. Trabajo presentado por Cesáreo Sáiz-Jiménez en la tesis doctoral para la obtención del grado de doctor en la Technische Universiteit Delft.
URIhttp://hdl.handle.net/10261/56151
Appears in Collections:(IRNAS) Libros y partes de libros
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