Conclusions:

To sum up the discussion on categorization of chromatographic techniques, it could be said in which a large number of techniques fall under the head of liquid chromatography. This is mainly because of the fact that a large number of mechanisms operate with a liquid as a mobile phase. Therefore, there is the availability of a variety of kinds of surfaces as stationary phases. In addition, there have been some improvements in the methodology. The most important in this regard is the introduction of high performance liquid chromatography. The Gas chromatography, inspite of being a valuable tool for separations, remains hugely confined to gas-liquid chromatography since of certain limitations of its gas-solid version. The Supercritical fluid chromatography has to still catch up liquid and gas chromatography within their popularity. The whole discussion on classification is being summed up in Table.

It is not possible to include all the different features discussed in the text in the table because it may become too congested. However, the salient features of the classifications are being presented in the table.

Table :  Classification of Chromatographic Methods

Note:  The  various  forms  of  liquid  chromatography   can  be  carried  in  the  high performance liquid chromatography  mode; the exception being if the paper is used as the support.