Dispersion in Chromatography Columns - Dispersion Processes that take Place in an LC Column > Longitudinal Diffusion > The Diffusion Process > Page 21

Now, again noting that ,            

 

Noting, again that, (HD(s)), the contribution to the variance per unit length, will be .  Then, the contribution to the total variance per unit length for the column from longitudinal diffusion in the stationary phase will be

                            

 

i.e.,                               .                                 (9)

Introducing a packing factor the magnitude of which will depend on the quality of the packing, the contribution to the variance per unit length from diffusion in the stationary phase (HL(S))is given by,