气相色谱法测定蜜饯中甜蜜素含量的不确定度评定

Uncertainty Evaluation of Determination of Saccharin Content in Candied Fruits by Gas Chromatography

目的:分析评定气相色谱法测定蜜饯中甜蜜素含量的测量不确定度。方法:根据《测量不确定度评定与表示》(JJF 1059.1—2012)的要求分析不确定度来源,计算不确定度分量,合成标准不确定度并计算扩展不确定度。结果:在95%置信概率下,蜜饯中甜蜜素含量为0.679 mg·kg^(-1)时,扩展不确定度为0.033 mg·kg^(-1),标准曲线拟合过程对合成标准不确定度的贡献最大,测量重复性次之。结论:蜜饯中甜蜜素含量的测定应注重气相色谱仪的维护与检验人员技能的训练,以提升测量结果的准确性。

Objective:Analyze and evaluate the measurement uncertainty of measuring the content of saccharin in candied fruits using gas chromatography.Method:According to the requirements of JJF 1059.1—2012,analyze the sources of uncertainty,calculate the uncertainty components,synthesize the standard uncertainty,and calculate the extended uncertainty.Result:At a 95%confidence probability,when the content of saccharin in candied fruits is 0.679 mg·kg^(-1),the extended uncertainty is 0.033 mg·kg^(-1).The standard curve fitting process contributes the most to the uncertainty of the synthesized standard,followed by measurement repeatability.Conclusion:The determination of saccharin content in candied fruits should pay attention to the maintenance of gas chromatography and the training of inspection personnel’s skills to improve the accuracy of measurement results.