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根据JJF 1059.1-2012《测量不确定度评定与表示》技术规范要求,建立了粮食中磷化物残留测定不确定度的数学模型,分析了不确定度的主要来源,对该方法所得结果的已识别来源的不确定度影响进行评价。结果表明:一是样品中的磷化物含量,二是试验重复性操作过程,而其他方面的影响很小。其中磷化物含量的不确定度影响又主要来自标准曲线的拟合。因此在实际制备标准曲线时,必须严格规范操作。用该法粮食中磷化物含量是0.040mg/kg,扩展不确定度为1.5×10-3mg/kg。
According to JJF 1059.1-2012 Technical Requirements for Evaluation and Expression of Measurement Uncertainty, a mathematical model of the uncertainty of determination of phosphide residues in food was established. The main sources of uncertainty were analyzed. The results of the method were identified Uncertainty of the source of impact assessment. The results show that: one is the phosphide content of the sample, the other is the repetitive operation of the test, while the impact of other aspects is very small. Among them, the uncertainty of phosphide content mainly comes from the fitting of standard curve. Therefore, the actual preparation of the standard curve, we must strictly regulate the operation. With the method of food phosphide content is 0.040mg / kg, the expansion of uncertainty of 1.5 × 10-3mg / kg.