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Paramagnetic Effects on Solid State Carbon-13 Nuclear Magnetic Resonance Spectra of Soil Organic Matter

Department of Soil and Water, Waite Agricultural Research Institute, The University of Adelaide, Glen Osmond SA 5064, Australia

View larger version (20K): [in a new window]   Fig. 1. Carbon-13 cross polarization with magic angle spinning (CPMAS) nuclear magnetic resonance (NMR) spectra of unamended and cation-amended de-ashed soil organic matter (SOM). Difference spectra were generated by subtracting the cation-amended spectra from the unamended spectrum (adapted from Smernik and Oades, 1999).

View larger version (12K): [in a new window]   Fig. 2. Inversion-recovery spectra of a typical ultraviolet (UV) photo-oxidized soil.

View larger version (17K): [in a new window]   Fig. 3. Generation of proton spin relaxation editing (PSRE) subspectra from the linear combination of the fully relaxed and a partially relaxed inversion-recovery spectrum.

View larger version (18K): [in a new window]   Fig. 4. Proton spin relaxation editing (PSRE) subspectra for Cu2+–amended de-ashed soil organic matter (SOM) (Smernik and Oades, 1999).

View larger version (22K): [in a new window]   Fig. 5. Short recycle delay 13C Bloch decay nuclear magnetic resonance (NMR) spectra of unamended and cation-amended de-ashed soil organic matter (SOM). Difference spectra were generated by subtracting the unamended spectrum from the cation-amended spectra (adapted from Smernik and Oades, 1999).