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Correlating Manganese X-Ray Absorption Near-Edge Structure Spectra with Extractable Soil Manganese

^a Dep. of Agronomy, Purdue University, West Lafayette, IN 47907
^b Dep. of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907

View larger version (31K): [in a new window]   Fig. 1. Normalized Mn K x-ray absorption near-edge structure (XANES) spectra of field-moist (oxidized) and reduced West Point (WP) soil (heavy lines), showing the changes in Mn oxidation state after each step of a sequential extraction, and best fits of linear combinations of MnSO4, bixbyite, and birnessite to the raw XANES spectra (thin lines). Fit results equal %MnSO4:%Mn2O3:%birnessite. For comparison, three Mn oxidation state standards (MnSO4, bixbyite, and birnessite) and rhodochrosite (MnCO3) are also plotted.

View larger version (29K): [in a new window]   Fig. 2. Normalized Mn K x-ray absorption near-edge structure (XANES) spectra of field-moist (oxidized) and reduced Southeast Purdue Agricultural Center (SEPAC) soil (heavy lines), showing the changes in Mn oxidation state after each step of a sequential extraction, and best fits of linear combinations of MnSO4, bixbyite, and birnessite to the raw XANES spectra (thin lines). Fit results equals %MnSO4: %Mn2O3:%birnessite. For comparison, three Mn oxidation state stan-dards (MnSO4, bixbyite, and birnessite) and rhodochrosite (MnCO3) are also plotted.

View larger version (29K): [in a new window]   Fig. 3. Normalized Mn K x-ray absorption near-edge structure (XANES) spectra of field-moist (oxidized) and reduced Southwest Purdue Agricultural Center (SWPAC) soil (heavy lines), showing the changes in Mn oxidation state after each step of a sequential extraction, and best fits of linear combinations of MnSO4, bixbyite, and birnessite to the raw XANES spectra (thin lines). Fit results equals %MnSO4: %Mn2O3:%birnessite. For comparison, three Mn oxidation state standards (MnSO4, bixbyite, and birnessite) and rhodochrosite (MnCO3) are also plotted.