Apr 28, 2005· Refrigerant Conditions. The heat energy that causes a liquid refrigerant to change to a vapor at a constant saturation temperature for a given pressure is referred to as a latent heat process. Latent heat is heat energy that causes a change in phase of a substance without a change in the temperature of the substance.
Understanding and Improving SolidPhase Extraction. However, when compared to other sample preparation techniques such as protein precipitation, liquid–liquid extraction (LLE), or QuEChERS (quick, easy, cheap, effective, rugged, and safe), SPE can be considerably more time consuming and often requires a much greater effort toward method development.