G4 Evolved gas analysis

When samples are heated, volatile products and gases may be evolved. The identification of these may be carried out by many analytical techniques. Solid products may be analyzed as well. 

Separation by chromatographic techniques and analysis by spectrometry, titration and potentiometry may all be used to identify and measure the evolved gases. 

The decomposition of polymers, the distillation of oils and the evolution of gases from minerals, inorganics and complexes as well as the detection of products from catalytic reactions have all been studied by evolved gas methods. 

Differential thermal and differential scanning calorimetry (G2) Thermomechanical analysis (G3) 

During a heating process, any reaction or decomposition may produce gases. Although the gases may sometimes be absorbed, the technique is generally referred to as evolved gas analysis (EGA). 

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