Oxidized humic acids from the soil of heat power plant - Short Communication

Srđan Miletić, Jelena Avdalović, Jelena Milić, Mila Ilić, Aleksandra Žerađanin, Kristina Joksimović, Snežana Spasić

Abstract


Humic acids isolated from the soil of a heat power plant (HA-E) con­ta­minated with oil were analyzed by Fourier transform infrared spectroscopy (FTIR). In comparison with a humic acids standard (HA-S), a lack of an int­ense broad band of the stretching vibrations of hydrogen-bonded hydroxyl groups (3600–3200 cm-1) is evident. The HA-E spectra have a peak at 1649 cm-1, which could belong to carbonyl groups. HA-E are heavily oxidized and among the isolated microorganisms, Achromobacter denitrificans may be res­ponsible for such intensive oxidation of HA-E. To the phylogenetically diverse nitrate-reducing microorganisms that have the capacity to utilize reduced HA as electron donors in soils, A. denitrificans can be added.

Keywords


humic acid; microorganism; FTIR; contaminated soil

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DOI: https://doi.org/10.2298/JSC190726099M

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