The use of alternative fluids in on-line supercritical fluid extraction - capillary gas chromatography

✍ Scribed by Levy, Joseph M. ;Storozynsky, Eugene ;Ravey, Robert M.

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 428 KB
• Volume: 14
• Category: Article
• ISSN: 0935-6304
• DOI: 10.1002/jhrc.1240141005

✦ Synopsis

Abstract

A key feature differentiating analytical supercritical fluid extraction (SFE) from conventional liquid extraction is the possibility of varying the solvent strength of a supercritical fluid to achieve selective extractions of specific target compounds, or functional classes of compound, from complex matrices. This can be accomplished by using supercritical fluids other than carbon dioxide, for example, sulfur hexafluoride, nitrous oxide, or sulfur hexafluoride‐modified carbon dioxide. The use of these fluids will be demonstrated by the characterization of complex environmental and petroleum matrices by directly coupled SFE – capillary GC. On‐line SFE‐GC involves the decompression of pressurized extraction fluid directly into the heated, unmodified capillary split injection port of the chromatograph. This paper will also show how, by adjustment of the extraction temperature and pressure, SFE selectivity may be further enhanced.