7890 A GC-MS

Gas chromatography-mass spectrometry (GC-MS) is an analytical technique that combines gas chromatography and mass spectrometry to identify and quantify volatile compounds. A GC-MS instrument separates mixtures into individual components using a gas chromatograph and then analyzes each component with a mass spectrometer. GC-MS is widely used in chemical analysis across multiple industries.

In a GC-MS instrument, the gas chromatograph first separates complex mixtures by passing them through a column under a controlled temperature program. Components elute at different retention times based on their volatility and interaction with the stationary phase. The separated compounds then enter the mass spectrometer, where they are ionized, fragmented, and detected according to their mass-to-charge ratio. The resulting mass spectra are used to identify and quantify each analyte. Sample introduction is often automated using an autosampler to improve reproducibility and throughput.

Common applications of GC-MS include environmental monitoring (water and air analysis), pharmaceutical purity testing, food safety (pesticide residue analysis), forensic toxicology, and petrochemical characterization. In the semiconductor industry, GC-MS is used to characterize process chemicals, detect trace contaminants, and qualify cleanroom environments and materials for outgassing compliance.