Humic acids characterization by EDXS and 13C NMR spectroscopy
2010
Pospisilova, L.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Fasurova, N.,Vysoke Uceni Technicke, Brno (Czech Republic). Ustav Aplikovane a Spotrebni Chemie | Liptaj, T.,Slovenska Technicka Univ., Bratislava (Slovak Republic). Katedra NMR Spektroskopie a Hmotnostnej Spektroskopie | Jurica, L.,Colne Laboratorium, Bratislava (Slovak Republic)
Humic acids (HA) were isolated from five different soil types (Luvi-haplic Chernozem, Haplic Luvisol, Haplic Cambisol, Leptic Cambisol and Eutric Cambisol) and from compost. Basic soil characteristics were determined by commonly used methods. Fractional composition of humus showed that humic acids content was decreasing in the following order: compost more than Luvi-haplic Chernozem more than Haplic Luvisol more than Eutric Cambisol more than Haplic Cambisol more than Leptic Cambisol. Isolated humic acids preparations were characterized comparatively by chemical and spectroscopic methods. Elemental analysis showed the highest carbon content in Luvi-haplic Chernozem HA. The lowest carbon amount was in Eutric Cambisol. Energy-dispersive X-ray spectroscopy showed that all samples contained Fe, Cu, Zn, Ti, Ca, K, S, P, Si and Br. Practically no differences in elements contents between soil humic substances and compost were detected. The amount of aromatic C was higher in Luvi-haplic Chernozem than in other samples. Humic acids isolated from Cambisols showed that all samples contained less aromatic C and significantly more aliphatic C.
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