Evolved Gas Analysis (EGA)

Evolved Gas Analysis (EGA) is a technique for structural analysis of gases and vapors evolved when a sample is subjectedto controlled heating. EGA employs on-line coupling with FTIR, MS, GC-MS and TGA or DSC systems enabling simultaneous compositional, mass balance and calorimetric analysis. This technique finds use in analysis of a large variety of materials. The vast laboratory network of Infinita Lab, USA, offers this test to clients in the USA and across the world. ... Read More

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    Evolved Gas Analysis (EGA)

    Evolved Gas Analysis (EGA) is an analysis technique that determines the nature and amount of volatile product or products evolved from a sample subjected to a controlled temperature program. Vapors released from the sample due to processes such as evaporation, decomposition or outgassing of inclusions during thermal treatment are immediately transferred through an interface, to the evolved gas analysis (EGA) system. The EGA system can utilize a variety of techniques such as Fourier Transform Infrared spectroscopy (FTIR), Mass Spectrometry (MS) or combination of MS with gas chromatography (GC-MS). Simultaneous thermal analysis using techniques such as  TGA (thermogravimetry) or DSC (differential scanning calorimetry), can also be done, coupled with a fast Quadrupole Mass Spectrometer (QMS). This enables identification of the evolved gas components and real time correlation with the other thermal analysis parameters. In case directly coupled EGA systems are not available, then, the evolved gases can suitably be captured, for example, in an adsorbent followed by thermal desorption for off-line analysis.

    EGA is widely used for polymer/plastics samples that contain a variety of additives, such as flame retardants, fillers, plasticizers, coloring matters, and antioxidants. The EGA technique has also been applied to other materials including chemical, pharmaceuticals, biomass, and various organic and inorganic compounds.

    Common Uses of Evolved Gas Analysis (EGA)

    • Compositional and mass balance analysis
    • Aging and decomposition processes
    • Desorption behavior
    • Study of evaporation and volatilization processes

     Advantages of Evolved Gas Analysis (EGA)

    • Compositional, mass balance and calorimetric information can be measured real-time.  
    • Low sample quantity.
    • Wide heating temperature range and variety of materials can be analysed
    • Qualitative and quantitative analysis possible

    Limitations of Evolved Gas Analysis (EGA)

    • Samples must be vacuum compatible
    • Complicated for unstable materials
    • Mostly used for lower molecular weight gases/vapors.

     Industrial Applications of Evolved Gas Analysis (EGA)

    • Plastics, Polymers, Rubber
    • Coatings and Adhesives
    • Pharmaceuticals
    • Chemicals
    • Semiconductors
    • Petroleum
    • Food
    • Biomass
    • Environmental

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      FAQs on Evolved Gas Analysis (EGA)

      What is an EGA test?

      Evolved Gas Analysis (EGA) is an analysis technique that determines the nature and amount of volatile product or products evolved from a sample subjected to a controlled temperature program.

      How do you analyze a gas?

      Gasses can be analyzed by various spectroscopic, laser, and optical methods. The most widely used Evolved Gas Analysis (EGA) techniques include Fourier Transform Infrared Spectroscopy (FTIR), Gas Chromatography (GC), Mass Spectrometry (MS), or a combination of MS with GC (GC-MS).

      What is the example of evolution of gas?

      One of the byproducts of a chemical reaction is gas, such as oxygen, hydrogen, and carbon dioxide. An example for such an evolution is the reaction of Zinc (Zn) with Hydrochloric acid (HCl). Hydrogen gas is one of the byproduct of this chemical reaction.

      How do you know if an evolved gas is carbon dioxide?

      The evolved gas is passed through limewater. If the gas contains carbon dioxide, the color of the solution changes from colorless to milky.

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