原子吸收光谱法检测含乳饮料中铜的不确定度评定

Uncertainty evaluation for determination of copper in milk beverage by atomic absorption spectrometry

中文关键词:  铜  原子吸收法  含乳饮料  不确定度

英文关键词:copper  atomic absorption method  milk beverage  uncertainty

中文摘要:

      目的 对原子吸收光谱法检测含乳饮料中铜元素含量的不确定度进行评定。方法 从测量重复性、校准曲线等方面分析该方法的不确定度来源, 依据GB/T 5009.13-2003《食品中铜的测定》建立数学模型, 根据JJF 1059.1-2012《测量不确定度的评定与表示》对测量结果的各不确定度来源进行分析和量化。结果 当含乳饮料中铜含量为0.29 mg/L时, 其扩展不确定度为0.022 mg/L (k=2)。不确定度主要来源于试样测定时标准曲线使用玻璃量具的引入, 其次是测量重复性引入的不确定度。结论 本研究可为原子吸收法测定含乳饮料中铜含量的测量准确性提供参考。

英文摘要:

      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.