Fig. 7. Chemical shift ranges of eleven humic constituents with respect to their one-dimensional 1H and 13C nuclear magnetic resonance (NMR) and their 1H and 13C heteronuclear single quantum coherence (HSQC) NMR spectra.
Fig. 7. Chemical shift ranges of eleven humic constituents with respect to their one-dimensional 1H and 13C nuclear magnetic resonance (NMR) and their 1H and 13C heteronuclear single quantum coherence (HSQC) NMR spectra.