Ferrihydrite-Humic Associations: Magnetic Hyperfine Interactions

摘要: Humic-iron oxide associations are believed to exist in various surface environments, such as soils and waters, may add substantially the stability of organic matter under oxidizing conditions. However, a nondestructive, solid-state characterization is still lacking. In this paper synthetic coprecipitates between humic material (dissolved matter; DOM) obtained from Podzol ferrihydrite examined using X-ray diffraction (XRD) patterns Fe-specific Mossbauer spectra at temperatures 4.2 K room temperature. Lepidocrocite formed absence DOM. DOM induced formation four (XRD)-line that contained 96 mg C/kg. contrast pure four-line ferrihydrite, which was completely magnetically ordered K, synthesized DOM-ferrihydrite not fully had magnetic hyperfine field 1 2 T lower than ferrihydrite. Such an effect observed when only surface-adsorbed. We conclude components coprecipitated with Their interaction Fe atoms prevents complete spin freezing K. Solid-state 13 C nuclear resonance (NMR) suggested O-alkyl mainly responsible for oxide.