31P solid-state nuclear magnetic resonance spectroscopy of aluminum phosphate minerals |
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| Authors: | William F Bleam Philip E Pfeffer James S Frye |
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| Institution: | 1. Eastern Regional Research Center, USDA-ARS, 600 E. Mermaid Lane, 19118, Philadelphia, PA, USA
3. Department of Chemistry, Colorado State University Regional NMR Center, Colorado State University, 80523, Fort Collins, CO, USA
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| Abstract: | This study examines the links between 31P solidstate NMR studies of aluminum phosphate minerals and their crystallographic structures. We found that 31P isotropic chemical shift values,  iso, carry little information about mineral structures. There seems to be no relation between the chemical shift anisotropy,  =33–11 (33>22> 11), and indicies of phosphate-tetrahedra distortion. 31P1H heteronuclear magnetic dipole interactions, on the other hand, carry important information about hydrous phosphate mineral structures, information that should prove to be quite valuable in studies of phosphate adsorbed on mineral surfaces. This interaction can be measured through a variety of qualitative and quantitative experiments. It appears that spin diffusion is so rapid that subtle differences in hydrogen-bonding environments cannot be resolved. |
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