Reproducibility of retention data on porous polystyrene polymers (Porapaks)

Gas chromatography

“…Reproducibility in retention times of a few parts per ten thousand is possible under favorable conditions (359). Kaiser (502) discussed the accuracy and precision of measuring retention data and retention indices, and experimental data on Porapak columns showed large differences from batch to batch and varied with the method of conditioning (272).…”

Adsorption of aliphatic, alicyclic, and aromatic hydrocarbons on poly(ethylvinylbenzene-divinylbenzene) adsorbent at from effective zero to finite adsorbate surface coverage

“…This trend has continued and, at present, there is a considerable literature on the use of synthetic polymers for the GSC analysis of gases as well as trace organic compounds in aqueous matrices. In addition, the adsorbents have since found use as stationary phases in liquid chromatography (5,6) and as trapping agents for trace-level organic compounds present both in liquid (7) and in gaseous 0003-2700/86/0358-1395$01.50/0 (8,9) samples. However, and despite their widely documented advantages, the materials exhibit a number of drawbacks, these including poor batch-to-batch reproducibility (10) and changes in adsorptive properties with time (aging).…”

Gas chromatography

“…Sakodynsky and Panina (743) reviewed the properties, chromatographic characteristics, and applications of porous polymer sorbents. The lot-to-lot reproducibility and the effect of different methods of conditioning for Porapak were established on the basis of reproducibility of retention data and separation factors (227). Gough and Simpson (316) measured the reliability of porous polymer beads for water-alcohol analysis and attributed variations in the results to preferential losses by adsorption of water in the columns.…”