How does calcium drive the structural organization of iron–organic matter aggregates? A multiscale investigation
作者： Anthony Beauvois , Delphine Vantelon , Jacques Jestin , Camille Rivard , Martine Bouhnik-Le Coz
DOI: 10.1039/D0EN00412J
关键词:
摘要: Iron-organic matter (Fe-OM) aggregates are a key factor in the control of pollutant mobility. Their physical and structural organization depends on prevailing physicochemical conditions during their formation subsequent exposure to variations porewater goechemistry. Among these conditions, calcium (Ca) could be major parameter given its high concentrations environment affinity for OM. Mimetic environmental Fe-OM-Ca associations were synthesized at various Fe/organic carbon (OC) Ca/Fe molar ratios using Leonardite humic acid as OM model. The impact Ca Fe-OM was studied by combination X-ray absorption spectroscopy, small angle neutron scattering imaging techniques (TEM, cryo-TEM cryo-TXM). Iron phases constituted Fe(III)-oligomers, Fe(III)-nanoparticles ferrihydrite (Fh), all bound or embedded exhibit fractal with Fe-primary beads aggregated (Fe-PA) which themselves an aggregates. For Ca/OC (mol/mol) < 0.026, Fe-PA aggregate third level Fe-secondary aggregate. ≥ forms large Ca-branched network is dimer carboxylic sites. In such distributed network, distant from each other. All transitions driven partially screens interactions. micrometric should both surface reactivity Fe well mobility Fe, associated elements, notably soil porosity where they produced under natural conditions.
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