Caracterisation par analyse thermique differentielle des complexes de l'aluminium avec les acides fulviques et humiques |
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Authors: | T Dupuis |
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Institution: | (1) Laboratoire de Pédologie, Université de Poitiers, Poitiers, France |
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Abstract: | Résumé L'analyse thermique différentielle sous oxygène permet de caractériser divers complexes formés entre l'aluminium et les acides fulviques (ou humiques): en particulier, les complexes pseudo-solubles ne sont pas identiques aux complexes floculés. Les liaisons hydrogènes qui unissent l'alumine hydratée aux acides fulviques (ou humiques) dans la forme floculée rendent l'ensemble beaucoup moins stable thermiquement que les trois formes complexes pseudo-solubles.
Differential thermal analysis in oxygen renders possible the investigation of various complexes of aluminium with fulvic acid (or humic acid). The pseudo-soluble complexes are not identical with the flocculated complexes. The hydrogen bonds linking hydrated aluminium with fulvic (or humic) acids in the flocculated form reduce the thermal stability of the complexes compared with the three pseudo-soluble forms.
Zusammenfassung Die Differentialthermoanalyse in Sauerstoff ermöglicht die verschiedenen Komplexe des Aluminiums mit Fulvinsäure (oder Huminsäure) zu charakterisieren. Die pseudo-löslichen Komplexe sind nicht identisch mit den flockulierten Komplexen. Die das hydratierte Aluminium mit den Fulvinsäuren (oder Huminsäuren) in der flockulierten Form verbindenden Wasserstoffbindungen vermindern die thermische Stabilität der Verbindung gegenüber den drei pseudo-löslichen Formen.
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