Thermogravimetry combined with gas chromatography and mass spectrometry (TGA-GC/MS) can be the ideal choice for qualitative and quantitative analysis of evolved gases.
During the thermal degradation cycle of materials, the composition of the evolved gas changes too quickly for a GC/MS analysis in its standard configuration.
Specifically, the detailed study of complex profiles, characteristic of thermal analysis, requires:
- more than one sampling of the gases emitted during the TGA experiment
- the storage of the “collected” samples
- their sequential transfer to the GC/MS for the respective chromatographic separations and mass identifications.
The SRA Instruments TGA-GC/MS IST16 interface has been designed to meet the needs of qualitative and quantitative determinations of compounds emitted from the sample following simple and complex thermal reactions, overcoming the limitations imposed by the time of the chromatographic separation.
The IST16 interface allows to sequentially store 16 aliquots of the gas evolved during the thermal experiment in TGA and inject them automatically into GC/MS.
The gaseous samples are transferred from the storage interface to the GC by heating.
All transfer lines are temperature-controlled.
Technical features:
-
16 storage loops
- Heated transfer lines: 250 °C
- Loop volume: 250 µL (in standard configuration, different volumes optional)
- Multi-system compatibility
- Full automation
- Lines and loops treated with Sulfinert.
SRA IST management software:
The IST software developed by SRA allows to modify the storage sequence, save the methods, view the instrument status and automatically manage the start of GC analyses.