介绍用气相色谱—质谱联用法测定甘蓝中氟虫腈残留量不确定度的方法,建立不确定度评定的数学模型,进而分析确定了不确定度的来源,并对其各个分量进行量化和合成。评定结果表明:标准曲线拟合、重复性测量和回收率是其测量不确定度的主要来源;当甘蓝中氟虫腈含量为0.0821 mg/kg时,扩展不确定度U=0.00492 mg/kg(k=2)。 A method for the determination of the uncertainty of fipronil in cabbage by gas chromatography-mass spectrometry (GC-MS) is introduced. The mathematical model for evaluating the uncertainty is established. The sources of the uncertainty are analyzed and the components of the uncertainty are quantified and synthesized . The results showed that the standard curve fitting, repeatability and recoveries were the main sources of measurement uncertainty. When the content of fipronil in cabbage was 0.0821 mg / kg, the uncertainty of expansion was U = 0.00492 mg / kg k = 2).