Gas chromatography–mass spectrometry is a powerful combined technique that gives a higher level of substance identification of volatile chemicals than can be achieved by either system individually. The ability of MS to distinguish between closely related compounds overcomes coelution issues common to GC, resulting in both qualitative and quantitative identification of known and unknown compounds. GC-MS is a valuable addition to the forensics, environmental, pharmaceutical, and chemical lab, ranging from simpler entry-level systems to those optimized for complex research, natural gas analysis, or forensic toxicology. GC-MS mass analyzer options include single quadrupole, ion trap, TOF, and tandem quadrupole. Software is an important parameter here, since it can simplify compound identification and result in a higher-quality analysis. Before making a final choice, compare measurement accuracy, repeatability, and scan speed (systems can reach 20,000 u/sec). Sensitivity can be tricky to assess, however. Note the method used to measure S/N to be sure you’re comparing apples to apples.
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- Catalog Number: 220 MS
- Ionization Method: Electron Ionization (EI) / Positive Chemical Ionization (PCI)
- Resolution: Unit Mass (10% of Valley over Range)
- Mass Analyzer: Ion Trap
- Mass Range: 10 - 650 Da
- Catalog Number: 240 MS
- Ionization Method: Electron Ionization (EI) / Positive Chemical Ionization (PCI) / Negative Chemical Ionization (NCI)
- Resolution: Unit Mass Resolution 0.1 Da
- Mass Analyzer: Ion Trap
- Mass Range: 10 - 1000 Da
- Catalog Number: 490-GC / 490-GC PRO
- Catalog Number: 500 Ion Trap LC MS
- Ionization Method: Atmospheric Pressure Ionization (API)
- Resolution: < 0.5 u FWHM Over the Entire Range
- Mass Range: 50 - 2000 u
- Catalog Number: G3241A / G3242A / G3243A / G3245A
- Ionization Method: Electron Ionization (EI) / Positive Chemical Ionization (PCI) / Negative Chemical Ionization (NCI)
- Mass Analyzer: Monolithic Hyperboli Quadrupole
- Mass Range: 1.6 - 1050 u
- Catalog Number: G7020A / G7021A / G4513A / G4349A
- Ionization Method: Electron Ionization (EI)
- Mass Analyzer: Monolithic Hyperbolic Quadrupole
- Mass Range: up to 1050 u
- Catalog Number: 5975T LTM
- Ionization Method: Electron Ionization (EI)
- Resolution: Unit Mass Adjustable by Tune
- Mass Analyzer: Monolithic Hyperboli Quadrupole
- Mass Range: 1050 u
- Catalog Number: Natural Gas Analyzer
- Catalog Number: Pegasus GC-HRT
- Ionization Method: Electron Ionization (EI)
- Resolution: up to 50,000 FWHM
- Mass Analyzer: Time of Flight (TOF)
- Catalog Number: Pegasus 4D
- Ionization Method: Electron Ionization (EI)
- Mass Analyzer: Time of Flight (TOF)
- Catalog Number: Pegasus HT TOFMS
- Ionization Method: Electron Ionization (EI)
- Mass Analyzer: Time of Flight (TOF)
- Catalog Number:
- Ionization Method: Electron Ionization (EI)
- Resolution: 2M (FWHM)
- Catalog Number: GCMS-TQ8030
- Ionization Method: Electron Ionization (EI) / Positive Chemical Ionization (PCI) / Negative Chemical Ionization (NCI)
- Resolution: 0.5 - 3.0 u
- Mass Analyzer: Quadrupole
- Mass Range: 10 - 1090 m/z
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