Fig. 3. Cross polarization magic angle spinning (CPMAS) 13C and 15N nuclear magnetic resonance (NMR) spectra of the peat from the Padul Turba deposit and the lignite from the Arenas del Rey deposit.
Fig. 3. Cross polarization magic angle spinning (CPMAS) 13C and 15N nuclear magnetic resonance (NMR) spectra of the peat from the Padul Turba deposit and the lignite from the Arenas del Rey deposit.