gas chromatography mass spectrometry gas chromatography-mass spectrometry 2014-06-05T15:09:23Z An analytical technique in that combines the physical separation capabilities of gas chromatography (GC) with the mass analysis capabilities of mass spectrometry (MS). Molecular mixtures are initially vaporized and separated into components by GC. As these components exit the column, they are subjected to mass spectrometry for identification based on their mass-to-charge ratio and behavior in a magnetic field. GC-MS JSmith MMO:0000536 measurement_method_ontology