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L. Plummer, T. Wigley, D. Parkhurst (1978)
The kinetics of calcite dissolution in CO 2 -water systems at 5 degrees to 60 degrees C and 0.0 to 1.0 atm CO 2American Journal of Science, 278
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Chemical speciation calculations using Pitzer equations are used to assess the potential errors associated with the calcite dissolution kinetics reported by Truesdale (2015). While these errors are shown to be small, agreement between the measured saturation concentration of calcium and the thermodynamic solubility product of calcite is less good. Truesdale has derived an exponential equation for the increase in calcium concentration with time and has proposed that the observed long tails of slow dissolution constitute a second, slower exponential decay. The exponential equation assumes that the back reaction has an order of one half in both calcium and carbonate, orders that do not represent a consensus in the calcite dissolution literature. An alternative exponential function, based on a back reaction that is first order in calcium and carbonate, is derived.
Aquatic Geochemistry – Springer Journals
Published: Jun 23, 2015
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