13C nuclear magnetic resonance - an effective tool of chemical characteristics of humic acids | 13C nukleárna magnetická rezonancia - účinný nástroj chemickej charakteristiky humínových kyselín
2011
Barančíková, G., Výskumný ústav pôdoznalectva a ochrany pôdy, Bratislava (Slovak Republic)
In present time nuclear magnetic resonance (NMR) is one of the most important method at detail study of humic substances chemical structure, because NMR beside qualitative analyse can provide relatively exact quantitative analyse. 13C NMR is one of most useful spectral technique which allows quantitative determination of individual carbon type in soil organic matter structure. In Slovakia 13C NMR started to use at monitoring of detail changes of humic acids characteristics in Monitoring of soil organic matter since the 1994. In this contribution knowledge summarization about representation of different carbon structure of humic acids on the basis complex evaluation 13C NMR spectra and their calculated parameters during 15 years period are presented. Humic acids were isolated from different soil types (Fluvisol, Chernozem, Mollic Fluvisol, Andosol, Regosol, Cambisol, Dystric Planosol, Rendziic Leptosol, and Ranker) arable soils and pasture which represent basic scale of Slovak soil types of different agroclimate regions. Receiving data show that 13C NMR is useful instrument at study of differences in quantitative representation of organic carbon in individual chemical structures of soil organic matter of different soil types. The most parameters calculated from 13C NMR spectra (% of aliphatic and aromatic carbon, aromatic degree) are enough sensitive for determination of mineralization or humification process in soil organic matter during monitoring period.
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