Journal
SOLID FUEL CHEMISTRY
Volume 57, Issue 3, Pages 163-169Publisher
PLEIADES PUBLISHING INC
DOI: 10.3103/S036152192301010X
Keywords
humic acids; water-soluble iron and magnesium humates; thermodynamic stability of cations; Pourbaix diagram; electrode potential
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The thermodynamic stability of iron and magnesium ions at different acidity levels in aqueous medium was investigated using chemical thermodynamics methods and Pourbaix diagrams. The temperature dependence of the thermodynamic functions for the relevant reactions was calculated. The feasibility of replacing potassium and sodium ions with iron and magnesium ions in aqueous solutions of humic acid salts containing carboxyl and hydroxyl groups was demonstrated, leading to the formation of water-soluble iron and magnesium humates with high potential for practical applications.
The thermodynamic stability of iron and magnesium ions at different acidity of an aqueous medium was determined using chemical thermodynamics methods and Pourbaix diagrams. The temperature dependence of the thermodynamic functions of corresponding reactions was calculated. The thermodynamic feasibility of the reactions of replacing potassium and sodium ions in aqueous solutions of humic acid salts containing carboxyl and hydroxyl functional groups with iron and magnesium ions was established. The resulting water-soluble iron and magnesium humates can have a high potential for practical use.
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