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Sulfur K-edge XANES Spectroscopy as a Tool for Understanding Sulfur Dynamics in Soil Organic Matter

^a Dep. of Crop and Soil Sciences, Cornell Univ., Bradfield and Emerson Hall, Ithaca, NY 14853
^b Dep. of Crop and Soil Sciences, 418 ASI Building, The Pennsylvania State Univ., University Park, PA 16802

View larger version (15K): [in a new window]   Fig. 1. Sulfur K-edge XANES spectra (before deconvolution and nonlinear least squares fitting) recorded directly from the clay (Wushwush) and silt (Munesa) size particles and humic substance extracts from these size separates.

View larger version (14K): [in a new window]   Fig. 2. Comparisons of selected regions of S K-edge XANES spectra from the clay (Wushwush) and silt (Munesa) size separate and 0.1 M NaOH/0.4 M NaF extracts of these separates.

View larger version (29K): [in a new window]   Fig. 3. Nonlinear least square fit of experimental S K-edge XANES spectrum showing several oxidation states of S analysis for humic substances extracted from clay size separates (<2 µm) of a soil from Wushwush, Ethiopia. AT1 and AT2 are Arctangent 1 and 2. G1 to G5 are Gaussian Peak 1 to 5.

View larger version (23K): [in a new window]   Fig. 4. Stacked S K-edge (2472 eV) XANES spectra for humic substances extracted from clay (<2 µm) and silt size (2–20 µm) separates of soils from Wushwush, Ethiopia.

View larger version (21K): [in a new window]   Fig. 5. Stacked S K-edge (2472 eV) XANES spectra for humic substances extracted from clay (<2 µm) and silt size (2–20 µm) separates of soils from Munesa, Ethiopia.