Objective To establish a mathematical model of uncertainty evaluation for the determination results of oxytetracycline in liquid milk by ultra performance liquid chromatography-tandem mass spectrometry method. Methods The sources of uncertainty of the whole determination procedure were analyzed and the combined uncertainty was finally obtained. Results The expanded uncertainty of 0.0036 μg/g (k=2) with 0.049 μg/g of the content of oxytetracycline was derived. The major sources of uncertainty of measurement included the repeatability of detection and the curve fitting. Conclusion It is necessary to control experimental conditions and the linear of standard curve to make sure the testing results are accurate.
标题：超高效液相色谱-串联质谱法测定牛奶中土霉素残留的不确定度评估
英文标题：Uncertainty Evaluation for the Determination Results of Oxytetracycline in Liquid Milk by UPLC-MS/MS Method
