Caracterização espectroscópica (RPE e DRIFT) das frações húmicas durante a compostagem de lodo de fábrica de papel e serragem

Claudia Maria Branco de Freitas Maia; Cristiane Regina Budziak Fukamachi; Alessandro Piccolo; Antonio Sálvio Mangrich

doi:10.4336/2012.pfb.32.70.01

EPR and DRIFT spectroscopic characterization of humic fractions during composting of sawdust and paper mill sludge

Authors

Claudia Maria Branco de Freitas Maia Embrapa Florestas
Cristiane Regina Budziak Fukamachi Universidade Tecnologica Federal do Parana, Coordenação de Química
Alessandro Piccolo UniversitÃ di Napoli Federico II, Dipartimento di Scienze del Suolo
Antonio Sálvio Mangrich Universidade Federal do Paraná, Departamento de Química

DOI:

https://doi.org/10.4336/2012.pfb.32.70.01

Keywords:

Humic substances, UV-Vis, Humification

Abstract

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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Published

2012-06-13

How to Cite

MAIA, Claudia Maria Branco de Freitas; FUKAMACHI, Cristiane Regina Budziak; PICCOLO, Alessandro; MANGRICH, Antonio Sálvio. EPR and DRIFT spectroscopic characterization of humic fractions during composting of sawdust and paper mill sludge. Pesquisa Florestal Brasileira, [S. l.], v. 32, n. 70, p. 117, 2012. DOI: 10.4336/2012.pfb.32.70.01. Disponível em: https://pfb.sede.embrapa.br/pfb/article/view/303. Acesso em: 16 dec. 2025.

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Issue

Vol. 32 No. 70 (2012): abr./jun.

Section

Articles

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