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Eurasian Soil Science

, Volume 47, Issue 5, pp 400–406 | Cite as

Molecular composition of humic substances in tundra soils (13C-NMR spectroscopic study)

  • E. D. LodyginEmail author
  • V. A. Beznosikov
  • R. S. Vasilevich
Soil Chemistry

Abstract

Functional groups and molecular fragments of humic substances (HSs) from cryohydromorphic peat gley tundra and surface-gley tundra soils have been identified by 13C-NMR spectroscopy. The analysis of HS preparations has shown that the molecules of humic acids (HAs) are enriched with aromatic fragments compared to fulvic acids (FAs). Aliphatic chains, carbohydrate- and amino acid-type structures prevail in the carbon skeleton of the FAs. An integrated parameter of the HS hydrophobicity has been proposed. The parameter represents the total portion of unoxidized carbon atoms and allows indirectly assessing the amphiphilic properties of HSs.

Keywords

humic acids fulvic acids structural and functional parameters 

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Copyright information

© Pleiades Publishing, Ltd. 2014

Authors and Affiliations

  • E. D. Lodygin
    • 1
    Email author
  • V. A. Beznosikov
    • 1
  • R. S. Vasilevich
    • 1
  1. 1.Institute of Biology, Komi Scientific CenterUral Branch of the Russian Academy of SciencesSyktyvkarRussia

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