QUANTIFICATION OF C-13 IN SOLIDS USING CPMAS-DD-NMR SPECTROSCOPY

Quantitative analysis of several standard materials is used to evaluat e various techniques for analysis of C-13 cross polarization magic ang le spinning dipolar decoupling (CPMAS-DD)-NMR spectra. These results s uggest that uncertainty in the kinetics of the initial cross-polarizat ion process may lead to systematic errors in the fitting of CPMAS-DD-N MR data. Methods are suggested to minimize the effects of this potenti al source of error. These results indicate that C-13 CPMAS-DD-NMR can give quantitatively reliable results.