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The intrinsic dissolution activity of the basal (010) and edge (001) surfaces of gypsum and polycrystalline calcium sulfate anhydrite crystals has been investigated, under far from equilibrium conditions, via the channel flow cell (CFC) method with off-line inductively coupled plasma-mass spectrometry (ICP-MS) for the measurement of dissolved Ca2+ from the crystal surface. This approach allows measurements to be made over a wide range of flow rates so that the importance of mass transport versus surface kinetics can be elucidated. Complementary quantitative modeling of the dissolution process was carried out by formulating convective–diffusive equations that describe mass transport in the CFC, coupled to a boundary condition for dissolution of the crystal surface. We found that a linear rate law applied, and intrinsic dissolution fluxes were deduced. The following dissolution fluxes, J0 = kdiss × ceq were measured, where kdiss is the dissolution rate constant and ceq the calcium sulfate concentration in s...

the journal of physical chemistry c

Intrinsic Kinetics of Gypsum and Calcium Sulfate Anhydrite Dissolution: Surface Selective Studies under Hydrodynamic Control and the Effect of Additives