The equations (1)-(3) may be viewed as a model for the convective - dispersive transport of solutes in a porous medium undergoing a precipitation/dissolution reaction: Assume e.g. a cation M_1 and an anion M_2 be present in solution, where c_1 and c_2 denote the corresponding molar concentrations in solution relative to the water volume. The underlying geology and water flow regime are described by the water content θ, the bulk density e, the diffusion/dispersion coefficient D and the specific discharge q~*. In the reaction to be described, n particles of M_1 and m particles of M_2 can precipitate in the form of one particle of a (crystalline) solid M_3, which is attached to the surface of the porous skeleton and thus immobile.
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