DIFFUSION IN THE ION EXCHANGER
As described in Chap. 2, diffusion in the stationary phase, that
is, intraparticle diffusion in the ion exchanger, is also respon-
sible for dispersion of a solute in a chromatographic column.
The residence time of a solute in the ion exchanger is distributed
around an average value of t n = Rp 2/2D (Giddings, 1965), where Rp is the radius of the ion exchanger and n, the diffusion coefficient in the ion exchanger. The degree of the dispersion
in a column becomes larger with an increase in the ratio of the
residence time of a solute in the ion exchanger to the time re-
quired for passing through the interstices of a column. In this
chapter, we provide information about diffusion in ion exchangers
and a prediction method.