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+.

Bibliographic Details

Main Authors:	MAIA, C. M. B. de F., FUKAMACHI, C. R. B., PICCOLO, A., MANGRICH, A. S.
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
Subjects:	Substância húmica, Humificação, UV-vis,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/930545
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