title: Trace analysis of volatile nitrosamines by a modified nitrogen-specific detector in pyrolytic mode and by ion-specific determination of heptafluorobutyramines in a gas chromatography-mass spectrometry system.
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D004128:Dimethylnitrosamine / Q000652:urine; D005740:Gases; D006801:Humans; D013058:Mass Spectrometry / Q000379:methods; D009584:Nitrogen / Q000032:analysis; D009602:Nitrosamines / Q000032:analysis*
chemical_list: D005740:Gases; D009602:Nitrosamines; D004128:Dimethylnitrosamine; D009584:Nitrogen