HPLC
For a typical adsorbent such as silica gel, the most popular pore diameters are

150 and 200 A°
60 and 100 A°
100 and 150 A°
10 and 50 A°

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HPLC
Void volume refers to the

the volume of the column between the point at which solvents are mixed and the beginning of the column
the volume of solvent contained in a liquid chromatographic column
the time required for the gradient to reach the column
total volume of eluent in the column the remainder being taken up by the packing material

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