Objective To evaluate the uncertainty for determination of copper content in milk beverage by atomic absorption spectrometry. Methods From the measurement repeatability and the standard curve analysis, the uncertainty sources of the method was analyzed. According to GB/T 5009.13-2003 Determination of copper in the food, the mathematical model was established. According to JJF 1059.1-2012 Evaluation and expression of measurement uncertainty, the uncertainty sources of the measured results were analyzed and quantified. Results when the copper content in milk beverage was 0.29 mg/L, the expanded uncertainty was 0.022 mg/L (k=2). The uncertainty mainly came from standard curve introduced by the using of measuring glass, followed by the uncertainty of measurement repeatability. Conclusion This paper can provide reference for measurement accuracy of copper content in milk beverage by atomic absorption spectrometry.
标题：原子吸收光谱法检测含乳饮料中铜的不确定度评定
英文标题：Uncertainty evaluation for determination of copper in milk beverage by atomic absorption spectrometry
