The kinetics of barite dissolution and precipitation in water and sodium chloride brines at 44-85°C

Christy, AG and Putnis, A (1993) The kinetics of barite dissolution and precipitation in water and sodium chloride brines at 44-85°C. Geochimica et Cosmochimica Acta, 57 10: 2161-2168. doi:10.1016/0016-7037(93)90557-D


Author Christy, AG
Putnis, A
Title The kinetics of barite dissolution and precipitation in water and sodium chloride brines at 44-85°C
Journal name Geochimica et Cosmochimica Acta   Check publisher's open access policy
ISSN 0016-7037
Publication date 1993-01-01
Sub-type Article (original research)
DOI 10.1016/0016-7037(93)90557-D
Open Access Status
Volume 57
Issue 10
Start page 2161
End page 2168
Total pages 8
Language eng
Subject 1906 Geochemistry and Petrology
Abstract The dissolution rate of natural barite cleavage fragments was measured in deionized water and NaCl brines over the temperature range 44-85°C. Dissolution followed first-order kinetics, with an activation energy of 24.9 ± 10.1 kJ/mol. The observed insensitivity to stirring rate and low absolute value of the rate constant (extrapolated k at 25°C = 3.30 ± 1.31 × 10-3 L/m2s) indicated desorption rather than volume diffusion as the rate-determining step. The NaCl concentration had no effect on k up to 0.1 M. Barite growth from supersaturated aqueous solutions was also studied. Precipitation followed a second order rate law, k25°C = 162 ± 65 L2/sm2mol, Ea = 22.0 ± 14.3 kJ/mol, and was not sensitive to pH variation. A different rate law is likely to apply at high supersaturations, where a change in secondary growth morphology was observed.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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