DOI: 10.5593/SGEM2016/B32/S13.012


T. Minkina, L. Mashtykova, D. Nevidomskaya, T. Bauer, M. Burachevskaya
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-62-9 / ISSN 1314-2704, June 28 - July 6, 2016, Book3 Vol. 2, 87-94 pp

Copper interacted with the soil organic matter when applied as dry acetates at 300 mg/kg to Calcic Chernozem in a pot experiment. Soil samples were taken from the pots and analyzed before the beginning of the experiment and after 2 years of incubation. The total concentrations of Cu in the soil was determined by X-ray fluorescent scanning spectrometer. The total Corg was determined by the bichromate oxidation method and also C were determined in an oxygen stream using an analyzer. The elemental composition of C, H, and N in humic acids preparations were determined by a Perkin Elmer analyzer type 2400 and the O from the difference. For determining the concentration of Cu compounds strongly bound to organic matter were extracted using the following reagents: 3.2 M CH3COONH4 solution after oxidation of the organic substances with 30% H2O2 in the presence of 2 M HNO3 and heating to 85 oC; and mobile forms: exchangeable, complex compounds, acid-soluble metal were extracted using the following reagents: 1 N NH4Ac, pH 4.8; 1 % EDTA in NH4Ac, pH 4.8; 1 N HCl, respectively. Two years after the treatment, an appreciable part of the metal applied was found in the organic substances, predominantly in a loosely bound state. These organic substances were supposed to be organomineral complexes, the formation of which resulted in the partial destruction of humic acid molecules. These processes increased the content of aliphatic structures and decreased the content of humic acids in the organic matter of the Сhernozem.

Keywords: Calcic Chernozem, organic matter, Cu (II), contamination, humic acids

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