Fig. 1. Breakthrough curves, (1 – j) vs. , at x = 1 for the truncated power law () in Eq. [4], where = t/t₁ and the characteristic time t₁ = 1. The effect of the ß and ₂(t₂/t₁) parameters is analyzed. The velocity v = 1 and the dispersion D = 0.05. The boundary conditions are = 1/u, at x = 0 and /x = 0 at x = 1. The advection-dispersion equation (ADE) solution (dashed line) is plotted for reference.