Abstract
Humic (HA) and fulvic (FA) acids were extracted from poplar bark after 12 and 30 months of composting and characterized through functional groups analysis and FT-IR spectra. The extraction and purification procedures were those recommended by the International Humic Substances Society (IHSS). Total acidity and COOH, total OH and CO contents of FA were always greater than those of the corresponding HA. Carboxyl groups were the major components of total acidity. Phenolic OH groups content of HA was always higher than that of the corresponding FA, whilst the alcoholic OH groups content was higher in FA than in HA. There were no significant differences between HA extracted after 12 and 30 months of composting, but some differences were shown by the corresponding FA.
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