Abstract
The essential components of a supercritical fluid chomatography (SFC) instrument consist of a mobile phase container which usually is a pressurized gas cylinder, a pump, an injector, a column in a thermostatted compartment, a restrictor and a detector. The components are similar to the components of a gas chromatography (GC) or a high performance liquid chromatography (HPLC) instrument, with the exception of the restrictor, which is needed to maintain the pressure above the critical point. Cylinders with carbon dioxide are equipped with a dip tube to allow the liquid phase to be withdrawn. With gas-phase detectors working at atmospheric pressure, the restrictor is connected prior to the detector (Figure 2.1a). If the detection is performed under supercritical conditions, the restrictor is the last component in the sequence (Figure 2.1b).
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Greibrokk, T. (1993). Instrumentation for supercritical fluid chromatography. In: Dean, J.R. (eds) Applications of Supercritical Fluids in Industrial Analysis. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2146-0_2
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