Structure
and Chemical Composition of Soil C‑Rich
Al–Si–Fe Coprecipitates at Nanometer Scale
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Posted on 2023-11-30 - 19:07
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.
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Jamoteau, Floriane; Cam, Nithavong; Levard, Clément; Doelsch, Emmanuel; Gassier, Ghislain; Duvivier, Adrien; et al. (2023). Structure
and Chemical Composition of Soil C‑Rich
Al–Si–Fe Coprecipitates at Nanometer Scale. ACS Publications. Collection. https://doi.org/10.1021/acs.est.3c06557