Evolved gas analysis (EGA)
Many samples, on heating, release gases or vapour through desorption or decomposition. This release is accompanied by thermal effects and, obviously, mass losses, which, themselves, can be detected by the appropriate thermal analysis technique, e.g. DTA or DSC and TG respectively. The thermal analysis technique does not, however, identify the gas evolved and, for complex decompositions, such information is essential. It has thus become fairly routine to couple the basic techniques already described with a system for either detecting the evolution of gas (or gases) from the sample (evolved gas detection, EGD) or, more satisfactorily, detecting and identifying the gases evolved (evolved gas analysis, EGA) . The apparatus for EGA will obviously be more complex than that required for EGD.
KeywordsAtmospheric Pressure Chemical Ionization Thermal Analysis Technique Thermal Analysis Experiment Atmospheric Pressure Chemical Ionization Source Thermal Analysis Instrument
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