Material Science
Solutions for Thermal & Thermophysical Analysis


Evolved Gas Analysis (EGA)

TGA/STA-GC-MS Coupling


Highest resolution in EGA


GC is a high-resolution method for separating volatile and semi-volatile compounds. The gas mixtures are separated based on the differences in component distribution between a stationary phase (e.g. inner coating of a capillary) and a mobile phase (purge gas, e.g. helium). Since this gas separation in the GC column takes a certain amount of time – the duration of which depends upon sample characteristics, column flow rate, column length, and stationary and mobile phase – it is not possible to couple directly into the GC with a continuous online sample gas flow.


Our solution, therefore, was to develop a direct coupling in a quasi-continuous mode by using heated automatic valves, which allows for software-controlled gas sampling (flow-through sampling loop) and gas injection even at short intervals.

  • Unique TGA/STA-GC-MS coupling solution with patented event-controlled or temperature-dependent triggering

  • Cryo-trap mode to increase detection sensitivity

  • Perfectly heated gas transfer (300°C) from the TGA/STA to the valve box and the injector at the GC

  • Fast and wide-range QMS for analysis of the gas chromatogram

  • Independent application of GC-MS for liquid/gas injection at any time


The primary scope of TGA/STA-GC-MS coupling is to detect, separate and analyze organic components. The highly sensitive GC-MS gas detection and identification capabilities allow for improved analysis of additives, stabilizers, and residual solvents in:

  • food

  • pharmaceuticals

  • cosmetics

  • polymers

  • biomass


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