Thermogravimetry/Evolved Gas Analysis (TG-EGA)

TG-EGA is used for simultaneous thermo-gravimetric and chemical analysis of a sample. In the TG-EGA technique, the evolved gases from controlled heating of a sample are routed to an Evolved Gas Analysis (EGA) system, which may use FTIR, MS or GC-MS for compositional analysis.... Read More

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    Thermogravimetry/Evolved Gas Analysis (TG-EGA)

    TG-EGA is a hyphenated technique for simultaneous thermo-gravimetric and chemical analysis of a sample. Thermogravimetric analysis is performed using a Thermogravimetric Analyzer (TGA) or Thermobalance, to continuously measure the change in mass of a sample subjected to a controlled heating program. The reduction in mass occurs due to the evolution of gases (including volatile molecules), during processes such as evaporation, decomposition or outgassing of inclusions. In the TG-EGA method, the evolved gases are simultaneously routed to an 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). This enables identification of the evolved gas components and real time correlation with the mass change data from TGA. TG-EGA enables chemical fingerprinting of the volatile components and thermal decomposition products of a sample, along with a real-time, mass balance.

    Common Uses of TG-EGA

    • Analysis and characterization of natural resources such as coal, rocks and minerals
    • Analysis of thermal behavior and chemical composition of synthetic polymers
    • Analysis of Petroleum coke and waste sludge from Refinery and petrochemical plants
    • Study of Chemical reactions involving evolution of vapors
    • Adulteration detection in Foods
    • Residual solvent measurements in Pharmaceuticals
    •  Forensic analysis

    Advantages of TG-EGA

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

     Limitations of TG-EGA

    • Complicated for unstable materials

    Industrial Applications of TG-EGA

    • Fossil fuels
    • Geology and Mineralogy
    • Plastics, Polymers, Rubber
    • Pharmaceuticals
    • Chemicals and Petrochemicals
    • Petroleum
    • Food
    • Biomass
    • Environmental

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