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Hertkorn, N. ; Permin, A.* ; Perminova, I.* ; Kovalewskii, D.* ; Yudov, M.* ; Petrosyan, V.* ; Kettrup, A.

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

J. Environ. Qual. 31, 375-387 (2002)

Open Access Green as soon as Postprint is submitted to ZB.

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Nuclear magnetic resonance (NMR) resonance integrals obtained from one-dimensional NMR spectra provide semiquantitative contents of humic constituents with limited resolution in structural detail. When supplemented by connectivity information available from homo- and heteronuclear two-dimensional NMR spectra a more reliable assignment of humic substructures becomes available. This is demonstrated with a comparative one- and two-dimensional NMR analysis of a fulvic and a humic acid obtained from Eriophorum peat. An example of a detailed analysis of the proton chemical shift region normally attributed to carbohydrates shows substantial contributions from amino acids, amino and desoxy sugars, and highly oxidized aliphatic chains of intermediate length. The very good resolution of structural detail by a combined analysis of all NMR spectra shows that the effect of the fractionation procedure on the composition and chemical structure of humic materials is very significant. The comparison of the partial structures comprising humic acid (HA) and fulvic acid (FA) of the peat humic materials studied indicates that FA is diagenetically downstream of HA, favoring the biopolymer degradation (BD) model of humification.

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Publication type Article: Journal article

Document type Scientific Article

Keywords CHEMICAL CHARACTERIZATION; ORGANIC-MATTER; METHYL-GROUPS; AMINO-ACIDS; C-13 NMR; SUBSTANCES; PYROLYSIS; SPECTRA; SOILS; H-1

ISSN (print) / ISBN 0047-2425

e-ISSN 1537-2537

Journal Journal of Environmental Quality

Quellenangaben Volume: 31, Pages: 375-387

Publisher American Society of Agronomy

Reviewing status Peer reviewed

Institute(s) Institute of Ecological Chemistry (IOEC)