Title:	EPR and DRIFT spectroscopic characterization of humic fractions during composting of sawdust and paper mill sludge.
Authors:	MAIA, C. M. B. de F. FUKAMACHI, C. R. B. PICCOLO, A. MANGRICH, A. S.
Affiliation:	CLAUDIA MARIA BRANCO DE F MAIA, CNPF; CRISTIANE REGINA BUDZIAK FUKAMACHI, UFPR; ALESSANDRO PICCOLO, Università di Napoli Federico II; ANTONIO SÁLVIO MANGRICH, UFPR.
Date Issued:	2012
Citation:	Pesquisa Florestal Brasileira, Colombo, v. 32, n. 70, p.117-122, abr./jun. 2012.
Description:	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+.
Keywords:	Substância húmica Humificação UV-vis
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPF)