Analytical Supercritical Fluid Extraction by Maria Dolores Luque Castro; Miguel Valcarcel Cases; M T

By Maria Dolores Luque Castro; Miguel Valcarcel Cases; M T Tena

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The other way entails starting in the vapour region (point B in Fig. 2), heating the substance above its Tc and then raising the pressure above its critical value. The critical point is characteristic for each substance. 1 lists the critical pressure and temperature for various solvents classified according to their chemical nature, as well as the fluid density at the critical point, which is called the critical density (Pc). 3 shows the situation of several solvents on a three-dimensional graph based on their critical parameters, and Fig.

Janata J (1989) Principles of chemical sensors. Plenum Press, New York 20. Nichols GD (1988) On-line process analyzers. Wiley, New York 21. Scheeline T, Coleman M (1987) Anal. Chern. 59:1185A 22. Linares P, Lazaro F, Luque de Castro MD, Va1carcel M (1988) J. Autom. Chern. 20:88 23. Kingston HM, Jassie LB (1988) Introduction to microwave sample preparation. American Chemical Society, Washington 24. Izquierdo A, Luque de Castro MD (1990) J. Autom. Chern. 12:267 25. Giddings JC (1991) Unified separation science.

On the other hand, the temperature of the system is kept quite high since the heat applied to the distillation matrix reaches the extraction cavity to some extent. One further advantage is that no filtration is required. This procedure is widely used in a variety of applications including the determination of fats in foods and that of organic pollutants in soils and environmental filters. Continuous leaching systems are characterized by the fact that the extracting phase is flowed through the solid sample, which can be heated or subjected to ultrasound.

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