Comparisons of soil organic matter and its fractions by pyrolysis mass-spectrometry

摘要: Abstract Pyrolysis mass-spectra from a sample of the A 1 -horizon soil southern Spain showed predominant peaks related to furan derivatives similar those observed complex polysaccharides in which not only hexoses but also pentoses and deoxyhexoses were constituent units. Smaller peaks, typical for protein materials phenolic units, observed. On other hand, methoxyphenols lignins very small indicated limited amounts undecomposed lignin residues this sample. Peaks benzene or toluene small. Humic acid samples much more prominent signals materials, weaker polysaccharide-related than did entire Typical insignificant. Spectra grey brown humidic fractions like parent humic acid. Brown acid, however, stronger nitrogen sulphur compounds, indicating higher content protein-like fraction. Preparations hydrolyzed by 6 N HCl their pyrolysis products marked increase phenols methoxyphenols. In its pyrogram, humin resembled evident. Lignin-like seem be Hymatomelanic lignin. Pyrograms characteristic pattern polysaccharide with presence fragments polymers amino acids sugars. Fulvic spectra obvious dissimilarities that protein, as well phenols, low. Depending upon isolation method, fulvic preparations differing materials.