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以火焰原子吸收光谱法测定烤烟样品中的锰为实例,对测定结果的不确定度来源进行了详细的分析,采用《化学分析测量不确定度评定表示指南》对测量结果进行评估。对测定过程中不确定度进行了合理评定,包括了测量浓度,体积,称量以及测量重复性等引起的不确定度。最后合成标准不确定度,通过置信95%概率下的扩展因子2获得测量结果的扩展不确定度。
The determination of manganese in flue-cured tobacco samples by flame atomic absorption spectrometry (FAAS) was taken as an example. The sources of the uncertainty of the determination results were analyzed in detail. The measurement results were evaluated by using the Guide for Assessment of Uncertainty in Chemical Analysis. Uncertainty in the determination of the process of a reasonable assessment, including measurement of concentration, volume, weighing and measurement repeatability caused by uncertainty. Finally, the standard uncertainty is synthesized and the extended uncertainty of the measurement results is obtained by believing a spreading factor of 2 at 95% probability.