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The spectroscopic characteristics (DRIFT, UV-visible and EPR) of As características espectroscópicas (DRIFT, UV-visível e RPE) das frações húmicas foram estudadas durante a compostagem de serragem e lodo de fábrica de papel. A espectroscopia de infravermelho (DRIFT) revelou um composto rico em hidroxilas, carboxilatos, alquilas e carboidratos. A fração alifática está concentrada nos ácidos húmicos e na humina. A diminuição da razão E4/E6 durante a compostagem indica um aumento de cadeias orgânicas com ligações duplas conjugadas. Esta redução corresponderia a uma diminuição do teor de lignina e/ou a formação de porfirinas. O RPE mostrou que a humina apresenta a concentração mais alta de radicais livres e a menor concentração de Fe3+ livre.doi: 10.4336/2012.pfb.32.70.01The 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+.doi: 10.4336/2012.pfb.32.70.0

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