Chromatographic behaviour of isomeric compounds on porapak P

Gas chromatography

“…Similar problems were corrected by the addition of formic acid vapor for the analysis of free fatty acids without altering the retention times or column life (3). Abnormalities in the chromatographic behavior of isometric compounds (225), methyl branched ketones, and fatty acids (2) were detected in certain Porapak materials (225), and the oxidation of porous polymers by samples containing oxygen was noted (806). The use of polar Porapaks was found to be critical for the resolution of polar mixtures, such as formaldehyde/H2O (869), and Porapak Q was evaluated at cryogenic temperatures for the separation of 3He, Ne, and 2H in 4He (909).…”