In this paper,liquid chromatography-mass spectrometry was used to analyze the content of N-dimethylnitrosamine in dried squid,and a theoretical model was constructed according to the requirements of the CNAS-GL006∶2019,the sources of uncertainty parameters were identified,and the synthetic and extended uncertainty were calculated to ensure that the results of N-dimethylnitrosamine in the laboratory were standardized and reliable.The most significant source of uncertainty was the linear fitting of the standard working solution,and the result of N-dimethylnitrosamine content was expressed as(9.837 0±0.23)μg·kg-1,k=2.
liquid chromatography tandem mass spectrometryshrimpN-nitrosodimethylamineuncertainty
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