Effects of Column Length, Particle Size, Flow Rate, and Pressure Programming Rate on Resolution in Pressure-Programmed Supercritical Fluid Chromatography
- 1 February 1980
- journal article
- Published by Oxford University Press (OUP) in Journal of Chromatographic Science
- Vol. 18 (2) , 75-84
- https://doi.org/10.1093/chromsci/18.2.75
Abstract
In pressure-programmed supercritical fluid chromatography, particle diameters in the range of 122 μm to 205 μm were found to yield maximum resolution of oligomers of 800 molecular weight polystyrene when 5% isopropanol in pentane was employed as a mobile phase at 240°C. The ability of a given column to achieve maximum resolution was found to depend on the ratio of the pressure-programming rate to the average flow rate of the mobile phase. Resolution could be increased while analysis time decreased, when a fast pressure-programming rate was used in conjuction with a high flow rate. In addition, due to the unusual thermophysical properties of the super-critical mobile phase, operation at linear velocities that are generally considered to be in the region of turbulent flow were found to be necessary for maximum resolution.Keywords
This publication has 0 references indexed in Scilit: