Abstract：Objective To determine the residua of rechlorpyrifos in celeries, and to establish a mathematical model for analyzing the source of uncertainty generated during the determination steps and calculating the uncertainty of each component, the combineduncertainty and the expanded uncertainty so as to reflect the technology and equipment level of the laboratory. Methods We determined the content of chlorpyrifos in celeries according to Determination of 500 Pesticides and Related Chemicals Residues in Fruits and Vegetables by Gas Chromatography-Mass Spectrometry (GB/T 23200.8-2016). And the uncertainty was calculated according to Evaluation and Expression of Uncertainty in Measurement (JJF 1059.1-2012). Results The content of chlorpyrifos was 0.206 mg/kg, and the expanded uncertainty was U=2×u(w)=0.034 mg/kg. The result was expressed as W=(0.206±0.034) mg/kg, and k=2. Conclusion The standard curve fitting will cause the uncertainty to increase. In order to ensure the accuracy of data, the high-precision volumetric device should be selected to decrease the uncertainty.
杜菡, 吴天骄, 谷冠军, 龚锡文, 彭玉峰. 气相色谱-质谱法测定芹菜中毒死蜱的不确定度分析[J]. 实用预防医学, 2021, 28(8): 1010-1012.
DU Han, WU Tian-jiao, GU Guan-jun, GONG Xi-wen, PENG Yu-feng. Analysis of uncertainty for the determination of chlorpyrifos in celeries by gas chromatography-mass spectrometry. , 2021, 28(8): 1010-1012.
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