气相色谱法测定蔬菜中甲基异柳磷农药残留量不确定度分析

Uncertainty Evaluation on Determination of Isofenphos-methyl Pesticide in Vegetables by Gas Chromatography

为了分析GB/T 5009.144—2003测定蔬菜中甲基异柳磷残留量的不确定度主要来源,采用气相色谱法进行试验,建立数学模型以剖析整个测量过程中不确定度的来源,并且评定出影响甲基异柳磷测量的各个不确定度分量,最终得到合成不确定度。结果表明,当蔬菜中的甲基异柳磷农药残留量为0.25 mg/kg时,测定结果的扩展不确定度为0.03 mg/kg(k=2)。

In order to analyze the uncertainty of the residual amount of isofenphos-methyl in the vegetable by GB/T 5009.144-2003 ,gas chromatography was used to test.A mathematical model was established to analyze the sources of uncertainty during the measurement,and the uncertainty components were assessed.The synthesis uncertainty was obtained finally.The results showed that when the isofenphos-methyl pesticide residues in vegetable was 0.25 mg/kg, the expanded uncertainty of the measurement was 0.03 mg/kg （k=2）.