气相色谱-三重四极杆质谱联用法测定黄瓜中嘧霉胺的不确定度评定

Uncertainty evaluation for the determination of pyrimethanil residues in cucumber by gas chromatography-triple quadrupole mass spectrometry

中文关键词:  气相色谱-三重四极杆质谱法  黄瓜  嘧霉胺  不确定度

英文关键词:gas chromatography-triple quadrupole mass spectrometry  cucumber  pyrimethanil  uncertainty

中文摘要:

      目的 评定气相色谱-三重四极杆质谱联用法测定黄瓜中嘧霉胺残留量的不确定度。方法 按照GB 23200.113—2018 《食品安全国家标准 植物源性食品中208种农药及其代谢物残留量的测定 气相色谱-质谱联用法》, 参照JJF 1059.1-2012《测量不确定度评定与表示》, 建立气相色谱-三重四极杆质谱联用法测定黄瓜中嘧霉胺残留量的不确定度数学模型, 对检测过程中的各不确定度分量进行分析量化。结果 黄瓜中嘧霉胺残留量为0.018 mg/kg, 其扩展不确定度为0.00142 mg/kg (P=95%, k=2)。结论 测量结果不确定度的主要来源中, 标准溶液配制过程引入的不确定度贡献率最大, 在检验检测过程中, 可以通过选择合适的量具, 提高检测人员技术水平等措施来减小测量不确定度。

英文摘要:

      Objective To evaluate the uncertainty for the determination of pyrimethanil in cucumber by gas chromatography-triple quadrupole mass spectrometry. Methods According to GB 23200.113—2018 National food safety standard-Determination of residues of 208 pesticides and their metabolites in plant derived foods-Gas chromatography-mass spectrometry, and with reference to JJF 1059.1-2012 Evaluation and expression of measurement uncertainty, the uncertainty mathematical model for the determination of pyrimethanil residue in cucumber by gas chromatography-mass spectrometry was established. The uncertainty components in the detection process were analyzed and quantified. Results The residue of pyrimethanil was 0.018 mg/kg, and the expanded uncertainty was 0.00142 mg/kg(P=95%, k=2). Conclusion Among the main sources of uncertainty of measurement results, the preparation process of standard curve generates the greatest uncertainty component. In the process of inspection and detection, the measurement uncertainty can be reduced by selecting appropriate measuring tools, and improving the technical level of the testing personnel.