Evaluation of Uncertainty in the Determination of Fenitrothion in Vegetables by Gas Chromatography-Tandem Mass Spectrometry
According to the method of GB 23200.113-2018,the residual amount of methanophos in vegetables was detected by using methanophos D6 as the internal standard,and the uncertainty caused by the determination process was evaluated.The results showed that the content of thiophos in vegetables was 0.303 mg·kg-1,and its extended uncertainty was 0.017 mg·kg-1(k=2).The main factors affecting the uncertainty of measurement results are the dilution preparation of standard solution,the repeatability of sample measurement and the fitting of standard curve.
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