HUMIC ACIDS CHARACTERIZATION BY EDXS AND 13 C NMR SPECTROSCOPY

Abstract POSPÍŠILOVÁ, Ľ., FASUROVÁ, N., LIPTAJ, T., JURICA, L.: Humic acids characterization by EDXS and 13 C NMR spectroscopy. Acta univ. agric. et silvic. Mendel. Brun., 2010, LVIII, No. 1, pp. 139-146 Determination of humic acids spectral characteristics performed fast and convenient method for their quality evaluation. Humic acids (HA) were isolated from fi ve diff erent 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 compositon of humus showed that humic acids content was decreasing in order: compost > Luvi-haplic Chernozem > Haplic Luvisol > Eutric Cambisol > Haplic Cambisol > 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 detected elements in situ in HA molecule