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通过石墨炉原子吸收光谱法重复测定烟叶制品中的Pb,建立不确定度评定数学模型,系统分析和量化不确定度各分量。分析了测量过程中的不确定度主要来源于样品质量测量引入的不确定度分量、样品水分测量引入的不确定度分量、样品溶解液体积引入的不确定度分量、样品浓度测量引入的不确定度分量、样品测量重复性引入的不确定度分量,当Pb平均含量为2.8177μg/g时,评定其扩展不确定度为0.1994μg/g。
The determination of Pb in tobacco products by graphite furnace atomic absorption spectrometry was repeated, the mathematical model for evaluating the uncertainty was established, and the components of the uncertainty were systematically analyzed and quantified. It is analyzed that the uncertainty in the measurement process mainly comes from the uncertainty component introduced by sample quality measurement, the uncertainty component introduced by sample moisture measurement, the uncertainty component introduced by sample solution volume, and the uncertainty introduced by sample concentration measurement The uncertainty component introduced by repeatability of sample measurement is 0.1994μg / g when the average content of Pb is 2.8177μg / g.