原子吸收光谱法测定食品中镍含量的不确定度分析

Uncertainty Analysis of Nickel Content in Foodstuff by Atomic Absorption Spectrometry

本研究应用原子吸收光谱法测定食品中镍含量。对样品称量、定容、标准溶液及上机测试等过程进行全面分析,通过对各个不确定度分量的计算合成,找出影响测量不确定度的因素,并对各个不确定度分量进行评估。结果表明,该食品样品中镍的含量为(0.13±0.02)mg·kg^(-1),扩展不确定度为0.02 mg·kg^(-1)。

In this study, atomic absorption spectrometry was applied to determine the nickel content in foodstuffs.The processes of sample weighing, volume determination, standard solution and on-board testing were comprehensively analysed, and the individual uncertainty componentswere calculated and synthetized to find out the factors affecting the measurement uncertainty. The results showed that the content of nickel in the foodstuffs was(0.13±0.02) mg·kg^(-1), and the extended uncertainty was 0.02 mg·kg^(-1).