Thermogravimetry/Evolved Gas Analysis (TG-EGA)

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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.


  

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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