INTERACTION OF Cr (III) IONS WITH SODIUM HUMATE IN ACQUEOUS MEDIUM

Abstract

The regularities of the influence of chromium ions concentration and sodium humate rate on the process of complex formation upon the interaction of chromium (III) сhloride with sodium humate have been studied. In the course of the performed works it has been established that an increase in the concentration of the chromium ions rate from 0,005 up to 0,5% and the sodium humate rate from 0,1 up to 1,0 g contributes to increasing of the yield of humic substances up to 36,49% and chromium mass content up to 4,31%. Shifting of рН to the acidic field and the IRS data, have shown the formation of humate complex compounds with chromium ions. IR-spectra of the studied samples of complex humic compounds show complexity of their composition. It follows from the data of thermal analysis of the obtained complex compounds that the introduction of chromium ions into the structure of humic compounds in the form of Ме-О bond contributes to the acceleration of the processes of oxidation of humic compounds (the organic part) until complete burning-out of humates at the temperature up to 550оС. At the temperatures above 940оС the processes of destruction of the mineral part of humates start. The results of the functional analysis testify to the interaction of sodium humate with chromium ions, though no complete substitution of carboxylic and phenolic groups for chromium ions occurs. It has been established that other functional groups of humic compounds participate in the reactions of complex formation.

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