Abstract
Interactions of aliphatic and aromatic amines with soil and humic acids isolated from it are studied by means of spin labels and electron paramagnetic resonance (EPR) spectroscopy. Nitroxyl radicals containing amino groups are used as spin labels. It is found experimentally that aromatic amines are instantaneously converted to the bound state. It is shown that the microareas of their incorporation are characterized by a significant delay in the reduction of the nitroxyl fragment of spin-label molecules, indicating the formation of condensed structures typical of an oxidative binding mechanism. It is concluded that aliphatic amines do not bind to humic acids. It is noted that the studied process allows elucidating the formation of bound xenobiotic residues in soils.
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Original Russian Text © O.N. Aleksandrova, V.A. Kholodov, I.V. Perminova, 2015, published in Zhurnal Fizicheskoi Khimii, 2015, Vol. 89, No. 8, pp. 1269–1276.
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Aleksandrova, O.N., Kholodov, V.A. & Perminova, I.V. Using spin labels to study molecular processes in soils: Covalent binding of aromatic amines to humic acids of soils. Russ. J. Phys. Chem. 89, 1407–1413 (2015). https://doi.org/10.1134/S0036024415080038
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DOI: https://doi.org/10.1134/S0036024415080038