Page 126 - Tandem Techniques

Page 108

equated to zero, expressions for the optimum exit velocity (u o (opt)) and the minimum value for the
height of the theoretical plate (H(min.)) can be obtained and is given by the following two equations. (H
(min.)) is the plate height obtained by operating the column at the optimum velocity).

and

Now, from the Plate Theory [3], the peak variance in volume units of an open tubular column
of length (lc) and radius (rc) is given by,

where (nc) is the number of theoretical plates in the column. Now, by definition,

Thus, replacing by (Hc), and substituting for (Hc) from equation (3.4.)

and for an empty tube or an unretained peak, k'= 0, thus