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Application of Spin Counting to the Solid-State ³¹P NMR Analysis of Pasture Soils with Varying Phosphorus Content

School of Earth and Environmental Sciences, The Univ. of Adelaide, South Australia, 5005

View larger version (13K): [in a new window]   Fig. 1. Effect of recycle delay on 31P DP NMR signal intensity for soil L-H, the ashed residue of soil M-H, the NaOH–EDTA extract of soil M-H, and the HF-treated residue of soil M-H.

View larger version (35K): [in a new window]   Fig. 2. Phosphorus-31 CP and DP NMR spectra of soil M-H and H2SO4–treated, ashed, and HF-treated residues of soil M-H. Spinning side-bands are marked with an asterisk (*). The sharp signal seen at 15 ppm in some of the spectra is an artifact caused by breakthrough of the transmitter pulse.

View larger version (22K): [in a new window]   Fig. 3. Phosphorus-31 CP and DP NMR spectra of soils from the lowest elevations of the experimental site, L-L, L-M, and L-H. Spinning side-bands are marked with an asterisk (*). The sharp signal seen at 15 ppm in some of the spectra is an artifact caused by breakthrough of the transmitter pulse.

View larger version (21K): [in a new window]   Fig. 4. Phosphorus-31 CP and DP NMR spectra of soils from intermediate elevations of the experimental site, M-L, M-M, and M-H. Spinning side-bands are marked with an asterisk (*). The sharp signal seen at 15 ppm in some of the spectra is an artifact caused by breakthrough of the transmitter pulse.

View larger version (17K): [in a new window]   Fig. 5. Phosphorus-31 CP and DP NMR spectra of soils from the upper elevations of the experimental site, U-M and U-H. Spinning side-bands are marked with an asterisk (*). The sharp signal seen at 15 ppm in some of the spectra is an artifact caused by breakthrough of the transmitter pulse.

View larger version (24K): [in a new window]   Fig. 6. Phosphorus-31 CP and DP NMR spectra of residue and extract (unamended and neutralized) fractions from NaOH–EDTA extraction of soil M-H. Note that the vertical scales have been adjusted to allow direct comparison between corresponding CP and DP spectra for each soil fraction, but not among fractions. Spinning side-bands are marked with an asterisk (*). The sharp signal seen at 15 ppm in some of the spectra is an artifact caused by breakthrough of the transmitter pulse.