气相色谱-质谱法测定葡萄中苯醚甲环唑的不确定度评定

Uncertainty evaluation for the determination of difenoconazole in grape by gas chromatography-mass spectrometry

中文关键词:  葡萄  苯醚甲环唑  气相色谱-质谱法  不确定度

英文关键词:grape  difenoconazole  gas chromatography-mass spectrometry  uncertainty

中文摘要:

      目的 评定气相色谱-质谱法测定葡萄中苯醚甲环唑时的不确定度。方法 根据GB 23200.8-2016《食品安全国家标准 水果和蔬菜中500种农药及相关化学品残留量的测定 气相色谱-质谱法》建立模型, 根据JJF 1059.1-2012《测量不确定评定和表示》对不确定度来源进行分析量化。结果 苯醚甲环唑的合成不确定度为2.258%, 扩展不确定度为0.0451, 葡萄中苯醚甲环唑测定结果为(0.06047±0.00273) mg/kg, k=2。结论 本方法不确定度主要来源为标准溶液配制及其曲线拟合, 重复性测定对实验结果准确性影响较小。

英文摘要:

      Objective To evaluate the uncertainty for the determination method of difenoconazole in grape by gas chromatography-mass spectrometry. Methods According to GB 23200.8?2016 National food safety standards-Determination of 500 pesticides and related chemicals residues in fruits and vegetables-Gas chromatography mass spectrometry, the model was established. And according to JJF 1059.1?2012 Evaluation and expression of uncertainty in measurement, the main factors influencing the accuracy of the experimental results were analyzed and quantified. Results The synthetic uncertainty in determination of difenoconazole in grape was 2.258% and the expanded uncertainty was 0.0451. The determination results were (0.06047±0.00273) mg/kg, k=2. Conclusion The results show that the preparation of standard solution and curve fitting has a great influence on the accuracy of the experimental results, and the repeatability determination has a smaller influence on the accuracy of the experimental results.