原子荧光光度法测定保健食品中硒的不确定度评定研究

根据(JJF 1059.1-2012),建立了原子荧光度法测定保健食品中硒不确定度数学模型,分析了整个过程中各种不确定度的影响因素。量化各不确定度分量,计算合成不确定度和扩展不确定度。为检测机构实验室质量管理体系正常运行提供参考资料。本次测量结果为0.822±0.04 mg/kg,合成相对不确定度值为0.022 7;扩展不确定度为0.04 mg/kg,最大的不确定度是样品重复测定引起,其次是标准曲线拟合引起的不确定度。

Uuncertainty in Determining Selenium in Foods Using Atomic Fluorescence Spectrophotometric Method

According to JJF1059.1 -2012, this study established the method for measuring the uncertainty in determining se- lenium in foods using atomic fluorescence spectrophotometric method. It analyzed the influence of various uncertainty factors on the whole process to quantify the uncertainty components, calculating synthetic uncertainty and expanding uncertainty, providing reference data for the operation of laboratory quality management system in testing institutions. The measurement results was 0. 822 ± 0. 04 mg/kg, synthetic relative uncertainty value was 0. 022 7 ; Expanded uncertainty of 0. 04 mg/kg, repeated sample is the biggest uncertainty is caused, the second is the uncertainty caused by standard curve fitting.