A mathematical model presented in this paper describes the dispersion and concentration of
contaminants (fine and coarse) in porous medium with the effect of chemical reaction. Solute
transport in porous media is discussed by means of advection-dispersion equation. The effect
of particle mass parameter and reaction rate parameter on the dispersion coefficient and mean
concentration of a chemical solute is studied by introducing a slug of finite length. Analytical
solutions are obtained by varying the dimensionless time, axial distance and length of the
solute. The results are depicted using graphs.