气相色谱-串联质谱法测定果汁中毒死蜱残留量的不确定度评定

Uncertainty evaluation of determination of chlorpyrifos in fruit juice by gas chromatography-tandem mass spectrometry

中文关键词:  气相色谱-串联质谱法  毒死蜱  不确定度  果汁  内标曲线法

英文关键词:gas chromatography-tandem mass spectrometry  chlorpyrifos  uncertainty  fruit juice  internal standard curve method

中文摘要:

      目的 评定气相色谱-串联质谱法测定果汁中毒死蜱残留量的不确定度。方法 依据国家计量技术规范JJF 1059.1-2012《测量不确定度评定与表示》对毒死蜱测定中的不确定度来源进行分析, 通过建立数学模型量化不确定度分量, 计算合成不确定度和扩展不确定度。结果 本方法的不确定度主要来源于标准曲线的配制和样品的稀释过程。当果汁中毒死蜱残留量为41.1 μg/kg, 扩展不确定度为9.8 μg/kg, 毒死蜱残留量表示为(41.1±9.8) μg/kg (k=2)。结论 该评定方法可用于气相色谱-串联质谱法对果汁中毒死蜱残留量的不确定分析。

英文摘要:

      Objective To evaluate the uncertainty of determination of chlorpyrifos in fruit juice by gas chromatography-tandem mass spectrometry (GC-MS/MS). Methods According to the national metrology technical specifications JJF 1059.1-2012 Evaluation and expression of uncertainty in measurement, the sources of uncertainty of determination of chlorpyrifos were analyzed. Furthermore, the combined uncertainties and expanded uncertainties were calculated based on the established mathematic models. Results The uncertainties of this method mainly came from the preparation of standard curve and the dilution process of samples. The chlorpyrifos content of fruit juice was 41.1 μg/kg, the expand uncertainties was 9.8 μg/kg, and the chlorpyrifos content was (41.1±9.8) μg/kg (k=2). Conclusion This method can be used for the uncertainty analysis of chlorpyrifos residues in fruit juices by gas chromatography-tandem mass spectrometry.