PC: Evolve Columns Operating Manual v2
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Two further calculations can be performed to describe column efficiency.
Reduced plate height - takes into account the particle size of the media and enables comparison
between different media types. A low value of RPH denotes good column efficiency; a RPH of less
than 6 is expected.
(Where Pd is the mean particle diameter)
(Where the initial sample volume and the values of a and b are all expressed in the same volume
units)
Note: comparison of results should be undertaken with caution.
Different media manufacturers often express performance in terms of the definitions above.
Caution must be taken when interpreting performance results.
It is advised to check not only the media type used but also the flow rate, column diameter and bed
height. Often results are given for tests performed in laboratory scale columns.