ADSORPTION RATE IN THE CONVECTION-DIFFUSION MODEL

This study shows that adsorption experiments under flow allow determin ation of a phenomenological kinetic constant k(a), provided the system corresponds to an appropriate regime. Measurements of the adsorption rate along a capillary enable calculation of both the kinetic constant k(a) and the diffusion coefficient D of the solute, and the latter ca n be compared with independent results from other techniques. Alternat ively, measurements at a single position give an estimate of k(a) when the diffusion coefficient D is known. The conditions under which thes e results may be derived are discussed in detail.