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Stability of Reduced Organic Sulfur in Humic Acid as Affected by Aeration and pH

^a Dep. of Soil Science, North Carolina State Univ., Raleigh, NC 27695
^b Dep. of Physics, North Carolina State Univ., Raleigh, NC 27695

View larger version (23K): [in a new window]   Fig. 1. Sulfur K-XANES spectrum for the sample Humic Acid 2, along with the best fit combination of S standards. Spectra for standards are weighted by factors determined from the linear combination fitting

View larger version (24K): [in a new window]   Fig. 2. Stacked S K-XANES spectra for samples of Humic Acid 1 after aerating for 4 h at varying pH

View larger version (31K): [in a new window]   Fig. 3. Fractions of each model S component (fraction of total S) for samples of Humic Acid 1 aerated for 4 h at varying pH