Measurement of the pure dissolution rate constant of a mineral in water

Details Measurement of the pure dissolution rate constant of a mineral in water Measurement of the pure dissolution rate constant of a mineral in water

2009-11-26

arxiv.org/abs/0911.5054v1

Geochimica and Cosmochimica Acta 72 (2008) 5634-5640

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1016/j.gca.2008.09.007

We present here a methodology, using holographic interferometry, enabling to measure the pure surface reaction rate constant of the dissolution of a mineral in water, unambiguously free from the influence of mass transport. We use that technique to access to this value for gypsum and we demonstrate that it was never measured before but could be deduced a posteriori from the literature results if hydrodynamics is taken into account with accuracy. It is found to be much smaller than expected. This method enables to provide reliable rate constants for the test of dissolution models and the interpretation of in situ measurements, and gives clues to explain the inconsistency between dissolution rates of calcite and aragonite, for instance, in the literature.

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