小麦粉总灰分测定的不确定度评定

本文依据《测量不确定度评定与表示》（JJF 1059.1—2012）和《化学分析中不确定度的评估指南》（CNAS-GL006:2019）不确定度评定基本程序，建立小麦粉中总灰分测定不确定度的数学模型，通过对整个测定过程中各种不确定度因素的研究，分析该测定方法不确定度的来源并对其进行评定，确定不确定度分量，合成不确定度。结果表明：当样品总灰分为0.53 g/100 g时，其扩展不确定度为0.01 g/100 g(k=2)；方法重复性引入的不确定度影响较大。通过对测量不确定度的评定，为有效地控制小麦粉中总灰分的检测质量提供可靠的理论依据。

Uncertainty Evaluation for the Determination Results of Total Ash in Wheat Flour

According to the procedure for uncertainty assessment described in Evaluation of Uncertainty in Chemical Analysis Measurement(JJF 1059.1—2012) and Guidance on Evaluating the Uncertainty in Chemical Analysis(CNASGL006:2019), the mathematical model of uncertainty in determination of total ash in wheat flour was established. Through the study of various uncertainty factors in the whole determination process, the sources of uncertainty in the method were analyzed and evaluated, and the uncertainty was determined. The uncertainty was determined by the constant component. The results showed that the expanded uncertainty was 0.01 g/100 g(k=2) when the total ash was 0.53 g/100 g.The uncertainty caused by repeatability was greater.Through the evaluation of measurement uncertainty, reliable theoretical basis was provided for effectively controlling the detection quality of total ash in wheat flour.