title: The trace detection of some non-volatile nitrosamines by combined gas chromatography and mass spectrometry.
mesh_terms: D002849:Chromatography, Gas / Q000295:instrumentation*; D013058:Mass Spectrometry / Q000295:instrumentation*; D008722:Methods; D008832:Microchemistry; D009602:Nitrosamines / Q000032:analysis*
chemical_list: D009602:Nitrosamines