Abstract
Humic acid-like (RA-like) and core-humic acid-like (core-RA-like) were characterized during the high-rate composting process by CP-MAS C-13 NMR, pyrolysis-gas chromatography (GC) / mass spectrometry (MS), and elemental analysis. Results obtained indicated that humification proceeded through a relative concentration of aromatic fractions due to the faster degradation of the O-alkyl and alkyl fractions. Core-RA-like, after purification of the parent material, showed a large reduction of the O-alkyl fraction in terms of HA-like. We concluded that HA-like consisted of refractory organic molecules, such as lignin and biopolymers, which formed a stable structure (core-HA-like) coated with degradable material associated with the core by weak physical association, ether or ester bounds.
Original language | English |
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Pages (from-to) | 143-150 |
Journal | Soil Science and Plant Nutrition |
Volume | 48 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2002 |
Keywords
- nuclear magnetic-resonance
- c-13 nmr-spectra
- organic-matter
- determining quantitation
- substances
- lignin
- soils
- decomposition
- spectroscopy
- systems