Resumen

The invention relates to an improved miniature device that has been developed for use with liquids at high pressures and at a controlled temperature for the extraction of different types of chemical species from semi-solid or solid samples contained in a closed cell, thereby overcoming certain limitations linked to the thermal inertia of the system. The device includes a resistor that is inserted into a steel tube and a motor which guides air through the tube in order to heat the chamber containing the extraction cells. Both the resistors and the motor can switch on and off independently. The improved device reduces the time required for the liquid-based extraction of different types of chemical species from semi-solid or solid samples, thereby providing a very beneficial advance in terms of solving different problems that exist within the field of sample preparation in analytical chemistry.