Determination of dissolved organic carbon content in soil and selected lignohumate preparates | Stanovení obsahu vodou extrahovatelného uhlíku v půde a ve vybraných lignohumátových preparátech
2011
Pospíšilová, Ľ, Mendelova univ. v Brně (Czech Republic). Ústav agrochemie, půdoznalství, mikrobiologie a výživy rostlin | Drápelová, I.
Content of water extractable organic carbon and nitrogen was studied in mineral soils and selected lignahumate samples. Comparison of fractional composition of soil humic substances and lignohumates is given as well. Elemental composition and absorbance in UV-VIS spectral range of samples was also assessed. Object of our study was Luvic Chernozem (Unčovice), Haplic Cambisol (Námešť) and three commercial lignohumates. Results showed lower carbon in lignohumates (28-31 weight %) in comparison with soil humic acids (47-51 weight %). Nitrogen content was also very low in studied lignohumates (0.15-0.95%). Dissolved organic carbon represented in mineral soils less than 3% of total carbon (Luvic Chernozem - 2.4%, Haplic Cambisol 1.5%). Content of extractable inorganic and organic carbon in lignohumates was higher than in mineral soil. UV-VIS absorbance of lignohumates was comparable with absorbance of fulvic acid (at above 400 nm was the absorption maximum). Quality and stability of isolated soil humic acids was higher ib comparison with lignohumates.
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