(Py-)GC-MS (CDS/Thermo)

Instumentelle Analytik (Umwelt- und Bodenchemie)

Model:

GC Trace Ultra + DSQII-MSD (Thermo Fisher Scientific)

Optional coupling with a Pyroprobe 6150 (CDS Analytical)

Description:

Gas chromatography coupled with a mass selective detector (GC-MS) is commonly used for the analysis of non-polar organic chemicals. In principle all non-polar compounds dissolved in an organic solvent with sufficient volatility can be analyzed with detection limits down to the femtogram range with a high linear range. The use of a mass spectrometer as detector (quadrupole) enables the identification of unknowns by interpretation of mass spectra and by comparison via library search. Depending on the analytical question negative or positive Ions, which can be generated by EI or CI, can also be detected in one single run. The mass selective detector is well suited for samples with higher matrix by selection of characteristic ions for quantification.

Pyrolysis is the thermal decomposition of organic compounds either in solid or liquid state at elevated temperatures (40–1400 °C) in an anaerobic environment. It involves the cleavage of large complex molecules into smaller, more analytically amenable fragments. Coupling pyrolysis with GC-MS allows for the characterization of both natural and synthetic polymers (microplastics) in various environmental matrices.