By S. M. Hitchen, J. R. Dean (auth.), John R. Dean (eds.)
The persevered look for fast, effective and comparatively cheap technique of analytical dimension has brought supercritical fluids into the sector of analytical chemistry. components are universal: supercritical fluid chroma tography and supercritical fluid extraction. either search to use the original homes of a fuel at temperatures and pressures above the serious aspect. the commonest supercritical fluid is carbon dioxide, hired due to its low severe temperature (31 °C), inertness, purity, non-toxicity and cheapness. substitute supercritical fluids also are used and infrequently along side modifiers. The mixed gas-like mass move and liquid-like solvating features were used for more advantageous chroma tographic separation and speedier pattern coaching. Supercritical fluid chromatography (SFC) is complementary to fuel chro matography ( GC) and excessive functionality liquid chromatography (HPLC), supplying better potency than HPLC, including the facility to examine thermally labile and excessive molecular weight analytes. either packed and open tubular columns will be hired, supplying the potential to examine a variety of pattern forms. furthermore, flame ionization detection can be utilized, therefore delivering 'universal' detection.
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Additional resources for Applications of Supercritical Fluids in Industrial Analysis
Chromatographia, 31, 163167. E. , (1985), Development and applications of a combined SFC with FTIR. J. Chromatogr. , 24, 535-540. A. , (1990), Flow rate control in pressureprogrammed capillary SFC. J. Microcol. , 2, 26-32. , Saito, M. , (1986), Identification of polycyclic aromatic hydrocarbons in extracts of diesel particulate matter by SFC coupled with an UV multichannel detector. Anal. , 58, 2696-2699. , Mae, H. , (1990), Packed microcolumn SFC coupled with photodiode array UV detector and ICP.
After 25 INSTRUMENTATION: SFC -l Detector Injector Pump C02 ~ \0 He I Precolumn II J. 5 Instrumentation for two injection modes: solvent venting at supercritical conditions or solvent elimination by purging with an inert gas (He). the solvent is evaporated and the solutes are coated on the walls of the precolumn, the purging valve is switched back to the carbon dioxide line, and liquid or supercritical C02 is introduced. , 1991). The temperature gradient on the precolumn can be obtained by passing an electric current through a conductive paint coated on the outer surface.
J. Chromatogr. , 24, 535-540. A. , (1990), Flow rate control in pressureprogrammed capillary SFC. J. Microcol. , 2, 26-32. , Saito, M. , (1986), Identification of polycyclic aromatic hydrocarbons in extracts of diesel particulate matter by SFC coupled with an UV multichannel detector. Anal. , 58, 2696-2699. , Mae, H. , (1990), Packed microcolumn SFC coupled with photodiode array UV detector and ICP. J. High Resolut. , 13, 13-17. T. , (1985), On-line SFC with FTIR spectrometric detection employing packed columns and a high pressure lightpipe flow cell.
Applications of Supercritical Fluids in Industrial Analysis by S. M. Hitchen, J. R. Dean (auth.), John R. Dean (eds.)