||Thermal Modulation Interface between Supercritical Fluid Extraction and Supercritical Fluid Chromatography.
Mitra, S. ;
Wilson., N. K. ;
||Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Laboratory equipment ;
Supercritical flow ;
Aromatic polycyclic hydrocarbons ;
Supercritical fluid chromatography
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A thermal modulator that can act as an interface between supercritical fluid extraction and supercritical fluid chromatography was developed and tested. The modulator was made of a short segment of a fused-silica capillary column, which was coated on the outside with electrically conductive paint so that it could be heated rapidly by a pulse of electric current. An equivalent of an injection is made internally within a flowing stream containing the sample by alternately heating and cooling the modulator, rather than by introduction through an injection port or a valve.