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Ferrihydrite–Humic Associations

Magnetic Hyperfine Interactions

^a Institute of Soil Science, Technical Univ. of Munich-Weihenstephan, 85350 Freising, Germany
^b Faculty of Physics, Technical Univ. of Munich-Weihenstephan, 85350 Freising, Germany

View larger version (17K): [in a new window]   Fig. 1. X-ray diffraction patterns: (a) 79/05R, reference sample formed by rapid oxidation of a FeCl2 solution at pH 5.5; (b) 79/05; (c) 79/07, same as 75/05R, but in the presence of dissolved organic matter (DOM); and (d) 74/2, for comparison, four-line ferrihydrite, precipitated by rapid hydrolysis of a Fe(NO3)3 solution at pH 7 (Schwertmann et al., 2004).

View larger version (34K): [in a new window]   Fig. 2. Mössbauer spectra at 4.2 K: (top) sample prepared by rapid oxidation of a FeCl2 solution at pH 5.5 in the presence of dissolved organic matter (DOM) and (bottom) reference sample without DOM.

View larger version (17K): [in a new window]   Fig. 3. Effect of temperature on the (A) sextet proportion and (B) the magnetic hyperfine field (Bhf) of dissolved organic matter (DOM)–iron oxides as compared with standard two- and six-line ferrihydrites.

View larger version (40K): [in a new window]   Fig. 4. Effect of temperature on the Mössbauer spectra of a dissolved organic matter (DOM)–iron oxide (79/05) measured between 4.2 and 70 K, plus room temperature (RT).

View larger version (39K): [in a new window]   Fig. 5. Effect of temperature on the Mössbauer spectra of a dissolved organic matter (DOM)–iron oxide (79/07) measured between 4.2 K and room temperature (RT).

View larger version (13K): [in a new window]   Fig. 6. Solid-state 13C nuclear magnetic resonance (NMR) spectrum of the dissolved organic matter (DOM).