RESUMEN Esta investigacion presenta una solucion numerica del problema de transporte reactivo multicomponente en un acuifero confnado bajo condiciones de fujo estacionario. Se analiza un problema de dos reacciones simultaneas, una instantanea y otra lenta, respecto al fujo de agua y los procesos fisicos del movimiento de solutos, asumiendo que el acuifero tiene caracteristicas fisicas homogeneas y no presenta variacion temporal y espacial de la temperatura. Tomando como base la metodologia propuesta por Molins et al. [1] y desarrollada por Donado et al. (Enviado a Water Resour. Res.) [2], se realiza el desacople del sistema de transporte mediante la defnicion de una componente conservativa y una cinetica, que permiten separar las reacciones cineticas de las de equilibrio, transformando el sistema de transporte en dos ecuaciones diferenciales parciales. El principal resultado de la investigacion muestra que las reacciones en equilibrio pueden defnirse como funcion de la mezcla y de la reaccion cinetica. PALABRAS CLAVES: hidrogeologia, transporte reactivo de solutos, cinetica quimica, tasas de reaccion. ABSTRACT This research presents a numerical solution of the multicomponent reactive transport problem in a two-dimensional saturated porous media under steady fow conditions. The solved problem is a system with two simultaneous reactions, one instantaneous and another slow relative to the groundwater fow and the physical processes of solute transport, assuming that the aquifer is physically homogeneous and does not exhibit any temporal or spatial variations in temperature. Based on the methodology proposed by Molins et al. [1] and developed by Donado et al. (submitted to Water Resour. Res.) [2], the reactive transport system is decoupled into two components, one for each reaction (equilibrium and kinetic). Thus, the conservative component represents the equilibrium reaction and the kinetic component the slow reaction. This way the multicomponent reactive system is reduced to the solution of two partial differential equations. The main outcome of this research is that the equilibrium reaction rate can be defned as a function of the mixing and the kinetic reaction rate. KEY WORDS: hydrogeology, reactive transport of solutes, chemical kinetics, reaction rates.