Temperature dependence of the rate constant of the reaction of gypsum dissolution in water
https://doi.org/10.55959/MSU0579-9406-4-2024-63-6-179-184
Abstract
As a result of the analysis of data from literary sources, the average values of the reaction rate constant for the dissolution of gypsum in water (kav = 1,48 × 10–5 mmol/(cm2s), 25 °C) and activation energy (Eav I = 39 kJ/mol), characteristic of kinetic and diffusion-kinetic control conditions, were determined.. The calculated temperature dependence obeys the Arrhenius equation in the range 0–40 °C (logkav = 1,95–2021/T, K). An increase in solution temperature (T > 40 °C) causes diffusion inhibition of heterogeneous chemical reactions of gypsum dissolution. It is assumed that at T ≈ 40–42 °C the boundary between the macrokinetic regions of the process of dissolution of gypsum in water corresponds to the zone of temperature transition between the equilibrium state of gypsum and anhydrite (CaSO4 · 2H2Os-CaSO4 s-H2O; P = 0,1 MPa). It is proposed that a similar transition in electrolyte solutions should also be determined taking into account the diffusion resistance of the rate of chemical interactions on the reaction surface of gypsum with increasing solution temperature.
About the Authors
A. L. Lebedev
Lomonosov Moscow State University
Russian Federation
Russian Federation
Alexey L. Lebedev
Moscow
I. V. Avilina
Lomonosov Moscow State University
Russian Federation
Russian Federation
Irina V. Avilina
Moscow
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Review
For citations:
Lebedev A.L., Avilina I.V. Temperature dependence of the rate constant of the reaction of gypsum dissolution in water. Moscow University Bulletin. Series 4. Geology. 2024;(6):179-184. (In Russ.) https://doi.org/10.55959/MSU0579-9406-4-2024-63-6-179-184
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