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Poster De Conférence Année : 2017

Thermogravimetry and FT-IR spectroscopy: efficient approaches for organic amendments stability analysis?

Résumé

Faced with the need to reduce the use of chemical fertilizers, spreading of exogenous organic material (EOM) provides nutrients for crops and improving soil fertility depending on their biochemical composition. Our aim was to study the biochemical composition of EOM according to different methods, to predict their behavior in soil and determine appropriate management of these EOM. Six organic amendments (urban sludge, household compost, poultry manure, sludge compost, dry digestat, mature cattle manure) were characterized according their i) thermal decomposition by thermogravimetric analysis (TG-DSC) in oxidizing atmosphere between 23-900◦C, and by stability index R1 (% Masse loss of aromatic peak/% Masse loss of aliphatic peak) (ii) biological stability, IROC indicator [1], based on Van Soest biochemical fractionation [2] and short-term carbon mineralization in soil [3] and iii) FT-IR spectroscopy (wave number range 4000–400 cm-1). The six EOM present different TG weight loss curves (WL%). Total WL of organic matter fraction ranged from 40% (sludge compost) to 72% (poultry manure). The first derivative of the TG trace (DTG) profile clearly differentiated two exothermal peaks: 268-300°C and 441-497°C which respectively, could be attributed to carbohydrates (cellulose and lignocellulosic) and recalcitrant (complex aromatic) compounds decomposition. The R1 index showed a good sensitivity in detecting the changes in the forms of carbon composition. Urban sludge, household compost and poultry manure were more biodegradable (R1<0.8) and have low lignin content, contrary to sludge compost, dry digestat and mature cattle manure which were thermally more stable with a having 2 times more of lignin content. These results were globally consistent with values of IROC. The FT-IR spectra also allows to discriminate the different EOM. These results indicate that thermogravimetric and FT-IR spectra analysis are consistent with the IROC indicator that could be consider as reference but the techniques are much more easier to set up. As a perspective, these approach could be compared with sequential chemical extractions coupling with 3D fluorescence spectroscopy. [1] Lashermes, G., Nicolardot, B., Parnaudeau, V., Thuriès, L., Chaussod, R., Guillotin, M.L., Linères, M., Mary, B., Metzger, L., Morvan, T., Tricaud, A., Villette, C., Houot, S. 2009. European Journal of Soil Science, 60, 297-310. [2] AFNOR, 2009. Norme XPU 44-162. AFNOR, Paris [3] AFNOR, 2009. Norme XPU 44-163. AFNOR. Paris.
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hal-04561826 , version 1 (28-04-2024)

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  • HAL Id : hal-04561826 , version 1

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Nadia Bennegadi-Laurent, Sabine Houot, Nathalie Damay, Jean-Baptiste Besnier, Karine Laval, et al.. Thermogravimetry and FT-IR spectroscopy: efficient approaches for organic amendments stability analysis?. 17th INTERNATIONAL CONFERENCE RAMIRAN, Sep 2017, Wexford, Ireland. ⟨hal-04561826⟩
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