evolved gas analysis


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evolved gas analysis

[ē¦välvd ′gas ə‚nal·ə·səs]
(analytical chemistry)
An analytical technique in which the characteristics or the amount of volatile products released by a substance and its reaction products are determined as a function of temperature while the sample is subjected to a series of controlled temperature changes. Abbreviated EGA.
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Many of the units are suited for evolved gas analysis and feature a small sample environmental chamber for accurate atmosphere control.
The Cahn TGA is said to be ideal for evolved gas analysis (EGA), due to integrated design (TG-IR, TG-MS, TG-GC/MS).
Further, by combining TGA with an evolved gas analysis system such as mass spectrometry (MS), an analysis of the composition of the evolved gaseous product can now be obtained.