EPR and DRIFT spectroscopic characterization of humic fractions during composting of sawdust and paper mill sludge.
EPR and DRIFT spectroscopic characterization of humic fractions during composting of sawdust and paper mill sludge.
Author(s): MAIA, C. M. B. de F.; FUKAMACHI, C. R. B.; PICCOLO, A.; MANGRICH, A. S.
Summary: 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+.
Publication year: 2012
Types of publication: Journal article
Unit: Embrapa Forestry
Keywords: Humificação, Substância húmica, UV-vis
Observation
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