Poultry manure (PM) chars were obtained at different temperatures and charring times. Chemical−physicaludcharacterization of the different PM chars was conducted by cross-polarization magic angle spinning (CPMAS) 13C NMRudspectroscopy and thermal analysis. CPMAS 13C NMR spectra showed that the chemical composition of PM char is dependent onudproduction temperature rather than on production duration. Aromatic and alkyl domains in the PM chars obtained at the lowestudtemperatures remained unchanged at all heating times applied for their production. The PM char obtained at the highestudtemperature consisted only of aromatic structures having chemical nature that also appeared invariant with heating time.udThermogravimetry revealed differences in the thermo-oxidative stability of the aromatic domains in the different PM chars. TheudPM char produced at the highest temperature appeared less stable than those produced at the lowest temperatures. Thisuddifference was explained by a protective effect of the alkyl groups, which are still present in chars formed at lower temperature.udThe analysis of the chemical and physicochemical character of poultry manure chars produced at different temperatures canudincrease understanding of the role of these materials in the properties and behavior of char-amended soils.
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