COMPARISON OF UNCORRECTED RETENTION DATA ON A CAPILLARY AND A PACKED HEXADECANE COLUMN WITH CORRECTED RETENTION DATA ON A PACKED SQUALANE COLUMN

Retention data obtained previously at 25 degrees C on a hexadecane capillary column by Zhang et al, and a packed hexadecane column by Abraham et al., both uncorrected for any effects due to interfacial adsorption, were compared with retention data obtained by Poole et al. on a packed squalane column at 120 degrees C, with the latter fully corrected for such effects. It is shown that for most solutes, the capillary and packed column data are equally compatible with the squalene corrected data, but for the solutes dimethyl sulfoxide, dimethylformamide and dimethylacetamide the packed column data are in much better accord with the corrected data than are the capillary column data. It is further shown that both sets of results at 25 degrees C for carboxylic acids are in error, owing to dimerization. Retention volumes on Chromosorb G AW DMCS are reported at 25 and at 93 degrees C. It is shown that at 25 degrees C, there could be some contribution to solute retention from adsorption on the support, but that this is almost impossible at 93 degrees C.