The aim of this work was to study dissolution and solubility of humic acids in water. Systems were studied using solution calorimetry. Thermodynamics data of humic acids were determined in aqueous solutions in the temperature range from 298.15 K to 318.15 K. We compared two types of humic acids and influence of temperature. These HAs were isolated from two different organic origin – compost and South Moravian lignite. HAs was isolated from South-Moravian lignite from the mine Mír (locality Mikulčice, Czech Republic) and compost which was obtained from the composting plant in Náměšť n. Oslavou, Czech Republic. Isolation of HAs was performed according to the procedure recommended by the International Humic Substances Society (IHSS).Keywords: humic acid; dissolution; enthalpy; solution calorimetry
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