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Comparative Analysis of Partial Structures of a Peat Humic and Fulvic Acid Using One- and Two-Dimensional Nuclear Magnetic Resonance Spectroscopy

^a GSF-Research Center for Environment and Health, Institute of Ecological Chemistry, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany
^b Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 119899 Moscow, Russia

View larger version (16K): [in a new window]   Fig. 1. The 1H nuclear magnetic resonance (NMR) spectrum of the peat fulvic acid (FA) (top) and humic acid (HA) (bottom).

View larger version (23K): [in a new window]   Fig. 2. The 13C nuclear magnetic resonance (NMR) spectrum of the peat fulvic acid (FA) (top) and humic acid (HA) (bottom).

View larger version (38K): [in a new window]   Fig. 3. Correlated spectroscopy (COSY) (top) and total correlation spectroscopy (TOCSY) (bottom: mix = 70 ms) nuclear magnetic resonance (NMR) spectra of a peat fulvic acid (FA) (left) and humic acid (HA) (right) with sections of chemical shift indicated in Tables 3 (COSY) and 4 (TOCSY). For reasons of clarity only one set of boxes is shown (exception BT); the dotted box indicated in the TOCSY spectra has identical chemical shift range to the dotted box within Fig. 4 (see text).

View larger version (28K): [in a new window]   Fig. 4. Correlated spectroscopy (COSY) (upper left half) and total correlation spectroscopy (TOCSY) cross peaks (lower right half) of proteinaceous amino acids in proteins following alanine (A) according to chain position (COSY) and amino acid (TOCSY); see text (Wishart et al., 1995).

View larger version (28K): [in a new window]   Fig. 5. Heteronuclear single quantum coherence (HSQC) nuclear magnetic resonance (NMR) spectra of a peat fulvic acid (FA) (bottom) and humic acid (HA) (top) with sections of chemical shift indicated in Table 5; the dotted box corresponds to the range of chemical shifts shown in Fig. 6.

View larger version (36K): [in a new window]   Fig. 6. Heteronuclear single quantum coherence (HSQC) cross peaks of proteinaceous amino acids in proteins following alanine (A), edited according to signal multiplicity (black = methyl, gray = methylene, white = methine) and position within the side chain (Wishart et al., 1995).

View larger version (42K): [in a new window]   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.