aIstituto Sperimentale per lo Studio e la Difesa del Suolo Piazza M. D'Azeglio 30, 50121 Firenze, Italy
bEniricerche, 20097 S. Donato Milanese, Italy
Abstract:
Dipolar aprotic solvents (DMSO, DMF and Acetone) in mixtures with dilute HCl extract humic substances by an intermolecular H-bonds disruption mechanism. FT-IR spectra of extracts and difference spectra of unpurified and purified material and thermogravimetric analysis showed that dipolar aprotic solvents produce humic substances with low contents of inorganic impurities and structurally different from common extractants. DMSO and Acetone extract humus particurally rich in aliphatic and proteinaceous components as compared to common extractant.