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Carbon K-Edge NEXAFS and FTIR-ATR Spectroscopic Investigation of Organic Carbon Speciation in Soils

^a Cornell University, Dep. of Crop and Soil Sciences, Bradfield and Emerson Hall, Ithaca, NY 14853
^b Forschungszentrum Karlsruhe, Institute für Nukleare Entsorgung (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany

View larger version (36K): [in a new window]   Fig. 1. Typical C (1s) NEXAFS spectra deconvolution showing the main 1s–* transitions, the two * transitions and the arctangent step function (from left to right) from humic substances extracted from clay fraction (<2 µm) of a soil from Wushwush, Ethiopia. 1s–2*-transitions were not shown.

View larger version (20K): [in a new window]   Fig. 2. Carbon (1s) NEXAFS spectra for humic substances extracted from the clay (<2 µm) and silt (2–20 µm) fractions of soils from Wushwush, Ethiopia.

View larger version (20K): [in a new window]   Fig. 3. Carbon (1s) NEXAFS spectra for humic substances extracted from the clay (<2 µm) and silt (2–20 µm) fractions of soils from Munesa, Ethiopia.

View larger version (26K): [in a new window]   Fig. 4. Synchrotron-based FTIR-ATR spectra of humic substances extracted from the clay- and silt-size separates of soils from Wushwush, Ethiopia.

View larger version (29K): [in a new window]   Fig. 5. Synchrotron-based FTIR-ATR spectra of humic substances extracted from the clay- and silt-size separates of soils from Munesa, Ethiopia.