Summary
The direct coupling of supercritical-fluid extraction (SFE) to capillary, supercritical-fluid chromatography (SFC) is described. The SFE/SFC system has a flame ionization detector and a direct injection system. The interface consists of a developed restrictor unit and a trapping tube. The fluid extract is decompressed through a restrictor into the trap where the solutes are precipitated and concentrated. The solutes are transferred from the trap to the capillary column by valve switching. The efficiency of various traps has been evaluated using n-paraffin standards. The effect of extraction temperature and pressure on the extraction efficiency is discussed for polymer additives. The applicability of the SFE/SFC system is demonstrated using several polypropylene samples.
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Daimon, H., Hirata, Y. Directly coupled supercritical-fluid extraction/capillary supercritical-fluid chromatography of polymer additives. Chromatographia 32, 549–554 (1991). https://doi.org/10.1007/BF02327902
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DOI: https://doi.org/10.1007/BF02327902