Structure and chemical composition of soil C‑Rich Al−Si−Fe coprecipitates at nanometer scale

Jamoteau Floriane, Cam Nithavong, Levard Clément, Doelsch Emmanuel, Gassier Ghislain, Duvivier Adrien, Boulineau Adrien, Saint-Antonin François, Basile-Doelsch Isabelle. 2023. Structure and chemical composition of soil C‑Rich Al−Si−Fe coprecipitates at nanometer scale. Environmental Science and Technology, 57 (49) : 20615-20626.

Url - jeu de données - Entrepôt autre : https://figshare.com/collections/Structure_and_Chemical_Composition_of_Soil_C_Rich_Al_Si_Fe_Coprecipitates_at_Nanometer_Scale/6954024

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Soil carbon stabilization is mainly driven by organo-mineral interactions. Coprecipitates, of organic matter with short-range order minerals, detected through indirect chemical extraction methods, are increasingly recognized as key carbon sequestration phases. Yet the atomic structure of these coprecipitates is still rather conceptual. We used transmission electron microscopy imaging combined with energy-dispersive X-ray and electron energy loss spectroscopy chemical mappings, which enabled direct nanoscale characterization of coprecipitates from Andosols. A comparison with reference synthetic coprecipitates showed that the natural coprecipitates were structured by an amorphous Al, Si, and Fe inorganic skeleton associated with C and were therefore even less organized than short-range order minerals usually described. These amorphous types of coprecipitates resembled previously conceptualized nanosized coprecipitates of inorganic oligomers with organics (nanoCLICs) with heterogeneous elemental proportions (of C, Al, Si, and Fe) at nanoscale. These results mark a new step in the high-resolution imaging of organo-mineral associations, while shedding further light on the mechanisms that control carbon stabilization in soil and more broadly in aquatic colloid, sediment, and extraterrestrial samples.

Mots-clés Agrovoc : séquestration du carbone, spectroscopie aux rayons x, composition chimique, anguille, Andosol, coprécipité, coprécipitation, structure chimique, technique analytique

Mots-clés libres : Soil carbon cycle, Organic matter, Organo-mineral associations, Coprecipitates, Transmission electron microscopy, EDX, EELS

Classification Agris : P33 - Chimie et physique du sol
U60 - Sciences de la vie et de la Terre

Champ stratégique Cirad : CTS 7 (2019-) - Hors champs stratégiques

Agences de financement hors UE : Agence Nationale de la Recherche, Région Sud, Centre de Coopération Internationale en Recherche Agronomique pour le Développement

Projets sur financement : (FRA) Interactions organo-minerales : mécanismes à nano-échelle pour le stockage du carbone dans les sols

Auteurs et affiliations

• Jamoteau Floriane, CIRAD-PERSYST-UPR Recyclage et risque (FRA) - auteur correspondant
• Cam Nithavong, Université d'Aix-Marseille (FRA)
• Levard Clément, Université d'Aix-Marseille (FRA)
• Doelsch Emmanuel, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0002-7478-4296
• Gassier Ghislain, Université d'Aix-Marseille (FRA)
• Duvivier Adrien, Université Aix-Marseille (FRA)
• Boulineau Adrien, Université de Grenoble (FRA)
• Saint-Antonin François, Université de Grenoble (FRA)
• Basile-Doelsch Isabelle, Université d'Aix-Marseille (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/607307/)

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