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<abstract language="eng">This study reports the parameters which influence on extraction of humic substances (HS) from peat. The yield, organic and inorganic contend, E4/E6 ratio and elemental composition (C,H,N) of the extracted HS have been determined. The functional groups were identified by Fourier-transform infrared espectroscopy. The results showed influence of the extractor type, concentration, time, temperature and granular texture of the sample in the extraction. This work contributes to better understanding of the extraction process showing the necessity of the standard method to extract humic substances from soi

Substâncias húmicas de turfa: estudo dos parâmetros que influenciam no processo de extração alcalina