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

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

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HPLC
Void volume refers to the

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

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HPLC
HPLC methods include

liquid/solid (adsorption) chromatography
All of these
ion exchange and size exclusion chromatography
liquid/liquid (partition) chromatography

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