Gas Chromatography - Gas Supplies > Flow Programmers > Page 12

Then (6)

and n = Tt(0), where (Tt(0)) will be the retention time of the solute under the defined pressure programming conditions.

Taking a simple practical situation where the retention volume is 1000 ml on a given column operating at a (g) value of 2 and the retention time of the solute is 10 minutes (600 seconds). The flow properties of the column i.e. can be defined in the following manner,

From equation (3)

or . Thus,

Substituting for in (6), (7)

Equation (7) can now be employed to calculate the change in retention time for a series of solutes separated under pressure programming conditions in the defined column