Abstract
The couplings among fluid flows, advective and diffusive transport, and chemical reaction rates in fractured media or soils and changes in hydraulic properties due to precipitation and dissolution along fractures and rock matrix are important for many environmental management problems. Chemicals may undergo geochemical reactions and transformations, and the resultant speciation can enhance or hinder mobility. Some of these geochemical processes are fast and reversible, while others are slow in comparison with transport phenomena; many are dependent upon and cause changes in the pH and redox condition of the subsurface environment. Aqueous complexation, including acid-base reactions, tend to be rapid, while adsorption-desorption, precipitation-dissolution, and redox processes are often kinetic in nature, with system conditions far from equilibrium.
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