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Solid-State Carbon-13 Nuclear Magnetic Resonance of Humic Acids at High Magnetic Field Strengths

^a Department of Chemistry, The Ohio State University, 100 W. 18th Ave., Columbus, OH 43210
^b The Campus Chemical Instrumentation Center, The Ohio State University, 176 W. 19th Ave., Columbus, OH 43210

View larger version (10K): [in a new window]   Fig. 1. Pulse sequences used in this study: (A) Bloch decay, (B) ramp cross polarization (CP), and (C) CP, where CT is contact time and TPPM is two pulse phase modulated.

View larger version (22K): [in a new window]   Fig. 2. Graph of region areas versus contact time for Cedar Creek humic acid (HA), obtained using (A) cross polarization magic angle spinning (CPMAS) and (B) ramp CPMAS. See Table 1 for region assignments.

View larger version (21K): [in a new window]   Fig. 3. Comparison of ramp cross polarization magic angle spinning (CPMAS) 13C nuclear magnetic resonance (NMR) with different contact times (CT) to a Bloch decay NMR spectrum of Cedar Creek humic acid (HA). SN/h is the signal-to-noise ratio per hour of acquisition time.

View larger version (18K): [in a new window]   Fig. 4. Comparison of ramp cross polarization magic angle spinning (CPMAS) and CPMAS 13C nuclear magnetic resonance (NMR) of Cedar Creek humic acid (HA) using a DMX300 spectrometer. Contact time (CT) = 1 ms.

View larger version (22K): [in a new window]   Fig. 5. Comparison of 13C NMR spectra obtained on M-100 and DM-X300 spectrometers of (A) Diluvial humic acid (HA) from Japan (contact time [CT] = 1 ms), described by Matsuda and Schnitzer (1971); (B) Mangrove Lake HA from Bermuda (CT = 1 ms), described by Hatcher et al. (1983); and (C) HA from Mt. Rainier degraded wood, Washington (CT = 2 ms), described by Hatcher (1987).