EPR and DRIFT spectroscopic characterization of humic fractions during composting of sawdust and paper mill sludge.
The spectroscopic characteristics (DRIFT, UV-visible and EPR) of humic fractions were studied during composting of sawdust and paper mill sludge. Infrared spectroscopy reveals a compost rich in hydroxyl and alkyl groups and carboxylates and carbohydrates. The alkyl fraction is abundant in the humic acids and humin. The decreasing of the E4/E6 ratio during composting indicates an enhancement of the organic chains number, with conjugated double bonds. This decreasing would correspond to a reduction of the lignin content and/or formation of porphyrins. The EPR shows that humin presents the highest concentration of free radical and the lowest intensities of the Fe3+.
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Main Authors: | MAIA, C. M. B. de F., FUKAMACHI, C. R. B., PICCOLO, A., MANGRICH, A. S. |
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Other Authors: | CLAUDIA MARIA BRANCO DE F MAIA, CNPF; CRISTIANE REGINA BUDZIAK FUKAMACHI, UFPR; ALESSANDRO PICCOLO, Università di Napoli Federico II; ANTONIO SÁLVIO MANGRICH, UFPR. |
Format: | Artigo de periódico biblioteca |
Language: | English eng |
Published: |
2012-08-06
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Subjects: | Substância húmica, Humificação, UV-vis, |
Online Access: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/930545 |
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