Study of the artificial oxidation of a humic coal by 13C CP/MAS nuclear magnetic resonance

Abstract The cross-polarization/magic-angle spinning technique has been applied to obtain 13 C n.m.r. spectra of samples produced by artificial oxidation of a type III humic coal of southern Utah. The oxygen is mainly incorporated in carboxylic acid and phenol functional groups. Results are confirmed by infra-red spectroscopy.