Dispersion in Chromatography Columns - Experimental Validation of the Van Deemter Equation > Page 94

                                           i.e.  DS = xDm

Substituting for (DS) in equation (7)

                                       (69)

Inserting the expression for f1(k') recommended by Purnell (10) and the expression for f1(k') as derived by Van Deemter (2) and rearranging,

          (70)

Dividing throughout by   ,  and rearranging,

  (71)