Molecular Level Structural Analysis of Natural Organic Matter and of Humic Substances by Multinuclear and Higher Dimensional NMR Spectroscopy

NMR spectroscopy offers uniquely versatile options to obtain molecular level structural characterization of natural organic matter (NOM) and humic substances (HS). By defining the relative amounts and some structural detail of fundamental building blocks, multinuclear quantitative one dimensional NMR spectroscopy provides the key margin of any structural model of NOM/HS. A large array of higher dimensional NMR spectra serves to enhance the reliability of NMR resonance assignments and allows to define rather extended substructures of NOM/HS.