Total Porosity indicator

Indicates the total porosity of the column. The total porosity includes both the interparticle space and the intraparticle space.

Calculation

The total porosity is calculated from the following equation:

where
εT = total porosity
Ve = volume of eluent the column that is between the stationary phase particles (not in them)
Vi = volume of eluent within the stationary phase particles
V = total volume in the empty column
εe = interparticle porosity
εi = intraparticle porosity

Remarks

The total porosity of a column is usually around 0.65