Gas Chromatography

Five units, single and dual capillary inlet, autosamplers and ECD, FID, TCD and NPD detectors.

GC-AED-FID-MS/MS dedicated configuration:

An Agilent 6890 Gas Chromatograph (GC) is configured with two Dean’s switches, splitters to support two columns (polar and non-polar in series, switchable), 3-detectors, and a partial fraction collector for analysis. The GC triggers an exact mass spectrometer system.

The inlet is connected to non-polar column with a switchable polar column to achieve good separations. The elute from the selected column is simultaneously connected to an atomic emission detector (AED), a quadrupole time-of-flight exact mass MS/MS, and a FID for reference.

The FID is connected to a splitter to monitor solvent venting (if required) and provide a baseline due to its dynamic range. 

Helium and reagent gases (nitrogen, methane, oxygen, and hydrogen) are purified through getters or filters to ensure 99.99999s purity. This provides the lowest noise possible to achieve minimum detectable levels.

The AED provides simultaneous chromatograms for up to twenty-two elements including C,H,N,O,S,Cl, and other elements of interest. The AED also provides quantification and elemental speciation of each compound with CIC (compound independent calibration). The AED is able to repeatedly detect a minimum of 0.6 pg/sec of C, and 1 pg/sec of H. 

The Tandem Mass Spectrometer (MS/MS) is operated in APCI with APPI or ESI, depending on the compounds of interest. The APPI provides excellent ionization of PAHs. Cone voltage and collision cell voltage of the QTOF is adjusted to provide important molecular structure and compound distribution information. 

Stand-alone GC/MS systems are used for TCLP tests with a DB-624 column for VOC and DB-5 for SVOC tests. .