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
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

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HPLC
HPLC methods include

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

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