There is no petrographic evidence, however, supporting dissolution of the associated calcite cements in such porous sandstones (Fig. 4d g).
As a direct application example, the derived analytical solutions are used to investigate the fundamental behaviours of the NAPL dissolution problems associated with radial aqueous-phase-liquid flow in the fluid-saturated porous media.
The results show that oxidative dissolution of Pu(IV) associated with the surfaces of colloidal granite particles took place during the aging period.
This was attributed to dissolution of DNAPL mudstone aquitard associated sources at the base of the continuous gravel as well as contaminated groundwater from surrounding less permeable sand and gravel horizons draining into this permeable conduit.
[1] Thus it was the combination of sewage-derived phosphate, reduction of As V) to As III), and reductive dissolution of iron oxides associated with the sediments that caused concentrations of dissolved As in the anoxic zone to exceed the 0.13 μM drinking water standard.
Deeper in the sewage plume, biodegradation of organic compounds transported away from the disposal beds resulted in reductive dissolution of Fe oxides associated with the coatings; As V) was reduced to As III) either by As-respiring microorganisms or abiotic reactions.
Aggregate dissolution was associated with the dispersal of single free-swimming cells, and was found to be triggered by depletion of a limited growth substrate, such as carbon or oxygen.
This effectively increases the surface area of the crystalline urea and would promote faster dissolution and associated leaching.
The differences between gypsum and carbonate karst landscapes are largely related to the higher solubility of the gypsum, its lower mechanical strength, more ductile rheology, and the higher extent of interstratal dissolution processes, commonly associated with the presence of other salts at depth.
In addition to the dangling bonds, crushing produces a fine coating of damaged, strained, mineral powder with high surface area, which adheres to grain surfaces, and initially elevates rates of oxidation, dissolution and reaction associated with pyrite surfaces (e.g., [11]).
