✦ LIBER ✦

Isocratic networks in supercritical fluid chromatography II: Selectivities and effective plate numbers

✍ Scribed by Leyendecker, Dietger ;Leyendecker, Dagmar ;Schmitz, F. P. ;Klesper, E.

Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 278 KB
Volume: 10
Category: Article
ISSN: 0935-6304
DOI: 10.1002/jhrc.1240100307

No coin nor oath required. For personal study only.

✦ Synopsis

The dependence of the selectivity a and the effective plate number, N, on temperature and pressure is shown in threedimensional diagrams. The specific system studied was pentaneas the mobile phase, unmodified silica as thestationary phase, and a set of four polycyclic hydrocarbons as the test mixture. Temperature and pressure ranges were from 25 to 300% and from 30 to 75 bar, respectively. The plots for a and N are found to resemble thosefor capacityratio, k ,and resolution, R, studied earlier with the same system [I]. A distinct maximum is observed for N in the supercritical region, as found earlierfor k and R. This applies also to a for the homologous substrate pair naphthalene/anthracene, while the resemblance for a is less pronounced for the pair anthracenelpyrene.

📜 SIMILAR VOLUMES

Isocratic networks in supercritical flui

Isocratic networks in supercritical fluid chromatography

✍ Leyendecker, D. ;Leyendecker, D. ;Schmitz, F. P. ;Klesper, E. 📂 Article 📅 1986 🏛 John Wiley and Sons 🌐 English ⚖ 382 KB

For chromatography with supercritical fluids (SFC), the dependence of the capacity ratios k and of the mean resolution R , on temperature and pressure is presented as a three-dimensional diagram. A sufficient number of test chromatograms were run for the diagram to lead to an isocratic network in fo

Pressure drop effects on selectivity and

Pressure drop effects on selectivity and resolution in packed column supercritical fluid chromatography

✍ Lou, Xianwen ;Janssen, Hans-Gerd ;Snijders, Henri ;Cramers, Carel A. 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 718 KB

## Abstract The influence of pressure drop on retention, selectivity, plate height and resolution was investigated systematically in packed supercritical fluid chromatography (SFC) using pure carbon dioxide as the mobile phase. Numerical methods developed previously which enabled the prediction of