Interaction of modified humic acids salts with transition metal salts

The ability of copper, nickel, cobalt, cadmium and manganese salts to form water-insoluble complexes with modified sodium humates has been defined. The modification of humic acids has been carried out by the method of solid-phase mechanochemical synthesis with polyethylene glycol and hydroperite in a vibration apparatus. The structure and physicochemical properties of their macromolecules have been studied by IR spectroscopy and acid-base potentiometric titration. It is shown that modification with hydroperite leads to an increase in carboxyl groups, while modification with polyethylene glycol leads to the insertion of ethoxy groups into the structure of the humic acid macromolecule. Attention is drawn to the fact that for the modified samples of humic acids, the concentration of metal salts involved in the formation of complexes increases.

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