Chemical and physico-chemical characterization of vermicomposts and their humic acid fractions
Six earthworm-composted wastes (vermicomposts), orginating from animal manure, municipal solid refuse and sewage sludge, treated with Eisenia foetida or Lumbricus rubellus, were chemically characterized for their total organic carbon, ash, macronutrients, micronutrients and potentially toxic heavy metal contents. Humic acids were isolated from the vermicomposts and analysed for their major elemental, and some heavy metals, composition and for structural and functional properties by electron spin resonance, infrared and pyrolysis-mass spectrometry. Infrared and pyrolysis-mass spectra of vermicompost humic acids resemble those of typical grass lignin. The fact that humic acids are operationally defined in terms of acid-base solubility tends to consider lignins, degraded lignins or lignin-rich materials extracted from vermicomposts as humic acids.
| Main Authors: | , , , |
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| Format: | artículo biblioteca |
| Language: | English |
| Published: |
Elsevier
1989-06
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| Online Access: | http://hdl.handle.net/10261/55338 |
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