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目的采用超高效液相色谱-串联质谱法对牛奶中强力霉素残留的不确定度进行评估。方法测定牛奶中的强力霉素,建立该方法测定牛奶中强力霉素含量不确定度的数学模型,确定不确定度来源并对其评定。结果当牛奶中强力霉素含量为0.052μg/g时,其扩展不确定度为0.0056μg/g(k=2)。其中,测量重复性和标准曲线对不确定度的影响最大。结论通过采用超高效液相色谱-串联质谱法测定牛奶中强力霉素含量应严格控制实验条件,保证实验具有良好的重复性,另外还要保证标准曲线具有良好的线性。
OBJECTIVE To evaluate the uncertainty of doxycycline residues in milk by ultra performance liquid chromatography-tandem mass spectrometry. Methods The determination of doxycycline in milk was established. The mathematical model of the determination of doxycycline in milk was established. The sources of uncertainty were determined and evaluated. Results When the content of doxycycline in milk was 0.052 μg / g, the extended uncertainty was 0.0056 μg / g (k = 2). Among them, the measurement repeatability and the standard curve of the uncertainty of the greatest impact. Conclusion The determination of doxycycline in milk by ultra performance liquid chromatography-tandem mass spectrometry should be strictly controlled experimental conditions, to ensure good reproducibility of the experiment, in addition to ensure that the standard curve has a good linearity.