Abstract
An intra-column injection system is described whereby the contents of a sampling valve are discharged into the packing of a column and carried through the column by an ancillary curtain flow of solvent. The device has two advantages. Firstly, it permits columns, deteriorated by the formation of a void between the top of the packing and the frit to provide a satisfactory performance and in some cases, to recover their original efficiency. Secondly, it reduces column deterioration resulting from pressure pulse effects and packing shrinkage. The advantages of the device have been demostrated by its use with poorly packed columns and columns that have seriously deteriorated over a period of time.
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