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Characterization of fulvic acids during olive mill waste composting (Elemental,Thermal and fluorescence analyses) |
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| Authors: | M. Hafidi G. Ait Baddi V. Gilard P. Ramos K. Alimi J. C. Revel |
| Affiliation: | 1. Laboratoire Sol et Environnement (Lab. Eco-Végét.), Département de Biologie, Faculté des Sciences Semlalia , Université Cadi Ayyad , BP 2390, Marrakech, Morocco hafidi@ucam.ac.ma;3. Laboratoire Sol et Environnement (Lab. Eco-Végét.), Département de Biologie, Faculté des Sciences Semlalia , Université Cadi Ayyad , BP 2390, Marrakech, Morocco;4. Groupe RMN Biomédicale, Laboratoire SPCMIB , Université Paul Sabatier , 118 Route de Narbonne, 31 062, Toulouse, France;5. Laboratoire de TP de Spectroscopies , Université Paul Sabatier , 118 route de Narbonne, 31 062, Toulouse, France;6. Département de physique , Faculté de Monastir , Tunis, Tunisia;7. Equipe d’Agronomie, Environnement, Ecotoxicologie , ENSAT INP Auzeville Tolosane , BP 107, 31326, Castanet Tolosan cedex, France |
| Abstract: | Elemental analysis, fluorescence spectroscopy and differential scanning calorimetry (DSC) were applied to the study of fulvic acids isolated from different stages during olive mill waste composting. The fulvic extracted acids are characterized by a high nitrogen content and O/C ratio values that may result from the high degree of humification and the synthesis of more condensed humic complexes. This was confirmed by fluorescence spectroscopy in the synchronous-scan mode by the decrease of shoulder intensities at intermediate wavelengths indicating the increase of polycondensation and conjugation of unsaturated structures and the greater uniformity of fluorophores. Fluorescence spectra in the emission, excitation and synchronous modes became simpler with compost maturation. This was confirmed by DSC results which proved the high degree of polycondensation of aromatic nuclei of fulvic acid molecules during olive mill waste composting. |
| Keywords: | Fulvic acids Olive mill wastes composting Elemental analysis Fluorescence spectroscopy Differential scanning calorimetry |