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Soil Manganese Oxides and Trace Metals

Competitive Sorption and Microfocused Synchrotron X-ray Fluorescence Mapping

^a Dep. of Plant and Soil Sciences, Hills Bldg., Univ. of Vermont, Burlington, VT 05405-0082
^b Univ. of Chicago/CARS, National Synchrotron Light Source, Brookhaven National Lab., Upton, NY 11973-5000

View larger version (17K): [in a new window]   Fig. 1. Decrease in net Cr oxidation due to metal pretreatment vs. soil pH.

View larger version (58K): [in a new window]   Fig. 2. Elemental microdistributions (red corresponds to areas of greatest element-specific fluorescence intensity) in µSXRF scans following sample treatment with 0.3 mol Co/mol Mn: (a) 0.42 x 0.42 mm region of a Maple-B sample, and (b) a 0.42 x 0.42 mm region of a Maple-O sample.

View larger version (40K): [in a new window]   Fig. 3. Elemental microdistributions in µSXRF scans following sample treatment with 0.03 mol Pb/mol Mn: (a) a 0.40 x 0.40 mm region of a Holiday sample, and (b) 0.22 x 0.32 mm region of a Barber sample.

View larger version (35K): [in a new window]   Fig. 4. Elemental microdistributions in µSXRF scans following sample treatment with 0.03 mol Cu/mol Mn: (a) 0.42 x 0.42 mm region of a Ridge sample, and (b) 0.42 x 0.42 mm region of a Beech sample.

View larger version (12K): [in a new window]   Fig. 5. Correlation coefficient (r) for spatial overlap in microdistributions of Mn and added Co in µSXRF scans vs. (a) soil Cr oxidation capacity, (b) vs. Mn oxidation state (Mn-XANES main edge energy at half-height), and (c) vs. soil pH.