Journal
SOIL SCIENCE AND PLANT NUTRITION
Volume 48, Issue 2, Pages 143-150Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00380768.2002.10409184
Keywords
core humic acid-like; CP-MAS C-13 NMR; high-rate composting; humic acid-like; pyrolysis-GC/MS
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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.
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