Humic Acids Isolated from Selected Soils from the Russian Arctic and Antarctic: Characterization by Two-Dimensional 1 H- 13 C HETCOR and 13 C CP/Mas NMR Spectroscopy

Here we describe the molecular composition and resistance to decomposition of humic acids isolated from selected soils of the Russian Arctic and Antarctic. The degree of soil organic matter stabilization was assessed using modern instrumental methods: nuclear magnetic resonance spectroscopy (cross p...

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Bibliographic Details
Published in:Geosciences
Main Authors: Vyacheslav Polyakov, Evgeny V. Abakumov
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2019
Subjects:
cryoconite
cryosol
ornitogenic soil
permafrost-affected soils
molecular composition
Geology
QE1-996.5
Arctic
Antarctic
Yamal Peninsula
Antarc*
Antarctica
permafrost
Online Access:https://doi.org/10.3390/geosciences10010015
https://doaj.org/article/2f6364af21c848608f2f18ba1fb693a3
Description
Summary:Here we describe the molecular composition and resistance to decomposition of humic acids isolated from selected soils of the Russian Arctic and Antarctic. The degree of soil organic matter stabilization was assessed using modern instrumental methods: nuclear magnetic resonance spectroscopy (cross peak magic-angle spinning (CP/MAS) 13 C-NMR and 1 H- 13 C heteronuclear-correlation (HETCOR)). Analysis of the humic acids showed that aromatic compounds prevail in the organic matter formed in cryoconites, located on the surfaces of the glaciers. The predominance of aliphatic fragments is revealed in the soils of the Yamal peninsula and Antarctica. This could be caused by sedimentation of fresh organic matter exhibiting low decomposition stage due to the severe climate and processes of hydrogenation in the humic acids, destruction of the C-C bonds, and formation of chains with high hydrogen content. These processes result in formation of aliphatic fragments in the humic acids.

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