Variations of humic acid properties within peat profiles
2010
Klavins, M., University of Latvia, Riga (Latvia). Faculty of Geography and Earth Sciences | Sire, J., University of Latvia, Riga (Latvia). Faculty of Geography and Earth Sciences
A comparative and complex characterization of humic acids (HAs) isolated from Latvian peat profiles of different origins was carried out. Elemental and functional analysis of the isolated HAs was done, their acidity and molecular weights estimated. Spectral characterization included UV-Vis, IR, electron spin resonance and fluorescence spectra. Structural characterization of HAs was done using both 1H and 13C nuclear magnetic resonance spectra. Properties of peat HAs were compared with HAs from other sources (soil, water, coal, and synthetic humic substances). Major properties of peat HAs depend on their origin, indicating the importance of humification processes. HAs isolated from peat of more recent origin were more similar to soil HAs from older sources had greater degree of humification and were more similar to low-rank coal.
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