Chromatography general system, schematic

A schematic diagram of a chromatograph for SFC is shown in Figure 6.10. In general, the instrument components are a hybrid of components developed for gas and liquid chromatography that have been subsequently modified for use with supercritical fluids. Thus, the. fluid delivery system is a pump modified for pressure control and the injection system a rotary valve similar to components used in liquid chromatography. The column oven and... 

Fig. 4.2.2. Schematic drawing of general instrumentation for modern liquid column chromatography. 1, solvent delivery system 2. column system 3, detection.

In general, methods are classified according to the isolation technique and the detection system. Most methods for the isolation/separation of organomer-cury compounds have been based on solvent extraction, differential reduction, difference calculations between total and ionic mercury, derivatization, or with paper- and thin-layer chromatography (TLC). The most common approaches to organomercury separation and detection are schematically presented in Figure 1. 

A schematic drawing of the main parts of the SFC system is shown in Fig. 2. It consists of a high-pressure pump for pressurizing and delivering the solvent, usually CO2 connected to an oven, generally a modified gas chromatography used as the temperature controller for the SFC column. The injector should introduce small sample volumes into the column and a restrictor is placed between the end of the column and the detector to maintain the mobile phase in the supercritical state. A detailed description of each part of the system follows. 

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