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We have applied the lattice bond enumeration method to the calculation of the steady-state diffusion in a lattice with fixed traps. We show that, to first order in density of traps, our random walk calculations for the effective diffusion constant in lattices with periodically arrayed traps are in exact agreement with calculations carried out previously for randomly arrayed traps embedded in a three-dimensional continuum medium (fluid). Our lattice random walk results are independent of dimension for d &gt; 1, and we conjecture that this is also true for the continuum diffusion model.

Random walk properties from lattice bond enumeration: Steady-state diffusion on two- and three-dimensional lattices with traps