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Sensitivity of Soil Manganese Oxides

Drying and Storage Cause Reduction

^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 (70K): [in a new window]   Fig. 1. The Standard Cr Net Oxidation Test on field-moist soils under long-term storage at 3°C. The Lordstown-II results are shown as 1/10 of actual

View larger version (23K): [in a new window]   Fig. 2. The effect of air drying (dark treatment) on extractable Mn and the Standard Cr Net Oxidation Test. Error bars represent ± SE

View larger version (22K): [in a new window]   Fig. 3. The effect of air-drying treatment (dark, light, or in plastic vials in the dark) on extractable Mn and the Standard Cr Net Oxidation Test in the Subsupersoil. Error bars represent ± SE

View larger version (23K): [in a new window]   Fig. 4. Short-term air-drying effect on the Standard Cr Net Oxidation Test and the moisture content in the Denu soil. Subsamples were remoistened to original water content at 24, 48, and 72 h. Error bars represent ± SE

View larger version (29K): [in a new window]   Fig. 5. Comparison of successive Cr oxidation tests on field-moist and air-dried samples of the Lordstown-II and Denu soils (all results for the Denu soil are multiplied by 10). Samples were dried 1 wk and the water content was 3.7% for the Lordstown-II and 0.9% for the Denu. Error bars represent the SE

View larger version (18K): [in a new window]   Fig. 6. XANES spectra of the Subsupersoil soil comparing recent and long-term dried samples. Modeled fits are a linear mixture of the recently air-dried spectra and either aqueous Mn(II) or manganite

View larger version (19K): [in a new window]   Fig. 7. XANES spectra of Hardhack soil comparing recent and long-term dried samples. Modeled fits are a linear mixture of the recently air-dried spectra and either aqueous Mn(II) or manganite

View larger version (22K): [in a new window]   Fig. 8. XANES spectra of Mn standards. The synthetic birnessite is largely Mn(IV) but could contain as much as 20% Mn(III)