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Study of the thermolysis process of copper (II) sulfate pentahydrate by thermovolumometric method
https://doi.org/10.26896/1028-6861-2025-91-1-44-50
Abstract
When studying mixtures of minerals, composites of complex composition, and selecting powder catalysts, problems often arise for which the small masses of samples used in thermogravimetry do not provide sample representativeness. This requires the use of other methods of analysis that allow the use of samples ten times larger in mass. The paper presents the results of a study of the thermolysis process of copper (II) sulfate pentahydrate using a thermovolumometric method. During the tests, a sealed container with the analyzed substance and a thermoelectric converter was placed in a tubular furnace. The gas released during thermolysis entered the bubbling tank through the capillary. SoundForge13 and TableCurve 2D programs were used to process experimental data. The sources of error in the thermovolumometric analysis technique are analyzed. Dependencies that can be used to improve its accuracy are given. It was revealed that the value of the repeatability index obtained as a result of assessing the repeatability of the method is 3 °C; in the range of densities of the evolved gases 1. 25 – 1. 43 kg/m3, the resolution of the method in terms of the mass of the substance is 12 – 13 μg. The results obtained can be used to determine the temperatures of phase transitions when studying processes occurring during heating of mineral compositions, as well as the temperatures of decomposition reactions of substances. The accuracy of measurements can be increased by careful sample preparation, reducing the heating rate of the sample and introducing corrections to the measurement result based on the obtained dependencies.
About the Author
D. M. Mordasov
Tambov State Technical University
Russian Federation
Russian Federation
Denis M. Mordasov
106/5, ul. Sovetskaya, Tambov, 392000
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Review
For citations:
Mordasov D.M. Study of the thermolysis process of copper (II) sulfate pentahydrate by thermovolumometric method. Industrial laboratory. Diagnostics of materials. 2025;91(1):44-50. (In Russ.) https://doi.org/10.26896/1028-6861-2025-91-1-44-50
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