Abstract
The gas-like mass transfer and liquid-like solvating properties of supercritical fluids, together with considerations on automation, speed and cost, make supercritical fluids very attractive for application in coupled systems. A number of coupled systems in which supercritical fluids play a key role are described. Supercritical fluid extraction-capillary gas chromatography-mass spectrometry (SFE-cGC-MS) has been applied to the determination of pesticides in fruit juices. For the determination of polycyclic aromatic hydrocarbons, triazines, chlorophenols and phenoxy acids in water samples, the SFE-cGC-MS system was extended with a sample preparation station after SFE, allowing the addition of internal standards and derivation of the acidic solutes after SF extraction. The potential of on-line solid-phase extraction-supercritical fluid chromatography-diode array detection is illustrated with the determination of xanthines in iced tea and of traces of pesticides in water samples.
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