谭美龄 阎睿 谭顺中



摘 要:目的:评定超高效液相色谱-串联质谱法测定食品中五氯酚及其钠盐的不确定度。方法:根据JJF 1135-2005、JJF 1059.1-2012和CNAS-GL 06:2006中的相关规定,建立测定食品中五氯酚及其钠盐的不确定度数学模型,并逐层对不确定度来源进行分析。结果:通过对各分量进行合成,得出当样品中含量为3.39 μg·kg-1时,其扩展不确定度为0.20 μg·kg-1(k=2)。同时根据评定结果得出,影响检测结果的主次因素依次为:标准溶液配制及标准工作曲线的拟合、方法回收率、测量重复性、量取体积及样品称样量。结论:可为科学评价实验中的测定结果的准确性提供依据,同时为测量其他农药兽药残留量的不确定度评定提供参考。
关键词:五氯酚及其钠盐;不确定度;食品;超高效液相色谱-质谱法
Abstract:Objective: To evaluate the uncertainty of determination of pentachlorophenol and its sodium salt in food by ultra-high performance liquid chromatography-tandem mass spectrometry. Methods: According to the relevant regulations of JJF 1135-2005, JJF 1059.1-2012 and CNAS-GL 06:2006, a mathematical model of uncertainty for the determination of pentachlorophenol and its sodium salt in food was established, and the sources of uncertainty were analyzed layer by layer. Results: By synthesizing the components, the expanded uncertainty was 0.20 μg·kg-1 (k=2) when the content of the sample was 3.39 μg·kg-1. At the same time, according to the evaluation results, the main and secondary factors affecting the test results are: standard solution preparation and standard working curve fitting, method recovery, measurement repeatability, volume measurement, sample weighing. Conclusion: This study provided a basis for the scientific evaluation of the accuracy of the determination results in the experiment, and provided a reference for the evaluation of uncertainty in the measurement of other pesticides and veterinary drug residues.
Key words:Pentachlorophenol and its sodium salt; Uncertainty; Food; Ultra-high performance liquid chromatography
-mass spectrometry
中圖分类号:O657.63
五氯酚(Pentachlorophenol,PCP)及其钠盐属有机氯农药,广泛用作杀菌剂、除草剂、杀虫剂。由于具有水溶性,极易扩散,造成水或土壤污染。通过食物链,可能对人体造成危害[1]。农业部公告第235号《动物性食品中兽药最高残留限量》[2]规定,其在动物性食品中不得检出。
除了给出被测量的最佳估计值之外,一个完整的测量结果还应包含与该值相关的不确定度。本文根据JJF 1135-2005《化学分析测量不确定度的评定》[3]、
JJF 1059.1-2012《测量不确定度评定与表示》[4]和CNAS-GL 06:2006《化学分析中不确定度的评估指南》[5]
的要求,通过QuEChERS-UPLC-MS/MS评估了食品中五氯酚及其钠盐的测定的不确定性,旨在为实验室质量控制提供科学、准确的依据,为评估其他相关物质检测方法的不确定度提供参考。……