火焰原子吸收光谱法测定固态食品中铜的测量不确定度评定及分析

Evaluation and analysis of uncertaintyin determination of copper in solid food by flame atomic absorption spectrometry

对火焰原子吸收光谱法测定固态食品中铜含量的测量不确定度进行评定,详细分析方法的不确定度来源及其对检测结果的影响程度,确保检验检测结果的准确性。按照测量不确定度评定的通用规则,建立数学模型,从天平称取质量、标准溶液配制、检测仪器、重复性实验等多方面分析检验检测过程中不确定度的分量和来源,对影响结果不确定度因素进行分析评估。当取样量为0.3000 g,k=2(95%置信度),样品中铜含量为X=(3.42±0.16)mg/kg。火焰原子吸收光谱法测定固态食品中铜的含量,检测仪器带来的不确定度最大,天平称量带来的不确定度最小。

To evaluate the measurement uncertainty of copper content in solid food by flame atomic absorption spectrometry,and detailedlyanalyzed the source of uncertainty and the importance of each of them,so as to ensure the accuracy of the test results.According to the general rules of measurement uncertainty evaluation,a mathematical model is established,The components and sources of uncertainty in the process of inspection and detection are comprehensively analyzed,and the factors influencing the uncertainty of results are analyzed and evaluated.Determination of copper in solid food by Flame Atomic Absorption Spectrometry,when the sample weight is 0.3000 g,k=2(95%confidence level),the copper content in the sample is X=(3.42±0.16)mg/kg.Conclusion:The test instrument produce the most uncertainty and mass from balance produce the leastuncertainty.