Dimensionality effects on multicomponent ionic transport and surface complexation in porous media

Coulombic interactions between charged species in pore water and at surface/solution interfaces are of pivotal importance for multicomponent reactive transport porous media. In this study, we investigate the impact domain dimensionality on electrostatically coupled dispersion surface-solution reactions during acidic plumes major ions Column quasi two-dimensional flow-through experiments were performed, with identical silica media under same advection-dominated conditions. Equal mass fluxes different electrolyte solutions (i.e., HCl - pH ? 2.8, NaBr 100 mM, 2.8 plus mM) continuously injected 1-D 2-D breakthrough curves measured outlet domains. The presence pronounced ionic strength gradients transverse direction setup caused distinct retardation behaviors protons which not observed one-dimensional column experiments. Furthermore, cases salt electrolytes injection, considerably enhanced release H+ (>61%) from quartz surface was multidimensional system compared to setup. Reactive modeling performed reproduce experimental outcomes analyse coupling processes, based Nernst-Planck formulation diffusive/dispersive complexation solid-solution interface. Electrostatic Na+, Br?, H+, deprotonation upon formation sodium outer-sphere complexes, primary controllers spatial temporal features displayed by measurements. simulations allowed us interpret observations, visualize distribution spatio-temporal evolution dissolved solid species, identify a spatially heterogeneous zonation behavior fringe core setup, quantify components Nerst-Planck solutes. This study demonstrates that directly affects electrostatic aqueous non-trivial effects result significantly systems.