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Article Dans Une Revue Environmental Science and Technology Année : 2023

Structure and Chemical Composition of Soil C-Rich Al–Si–Fe Coprecipitates at Nanometer Scale

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 EDX (energy dispersive x-ray) and EELS (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 type 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.
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Dates et versions

hal-04498067 , version 1 (11-03-2024)

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Floriane Jamoteau, Nithavong Cam, Clément Levard, Emmanuel Doelsch, Ghislain Gassier, et al.. Structure and Chemical Composition of Soil C-Rich Al–Si–Fe Coprecipitates at Nanometer Scale. Environmental Science and Technology, 2023, 57 (49), pp.20615-20626. ⟨10.1021/acs.est.3c06557⟩. ⟨hal-04498067⟩
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