Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.2161c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, Issue 10, pp.2161-2168
Physics
1
Scientific paper
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 / m 2 s ) 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, k 25° C = 162 ± 65 L 2 / sm 2 mol, E a = 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.
Christy Andrew G.
Putnis Andrew
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