直读光谱仪测定不锈钢食具容器铬含量的不确定度评定

Determination of Chromium Content in Stainless Steel Food Containers Uncertainty Evaluation by Direct Reading Spectrometer

依据JJF1059—1999《测量不确定度评定与表示》,利用真空直读光谱仪测定不锈钢食具容器化学成分含量,以铬元素为例,通过建立数学模型,从人、机、料、法、环、溯六方面分析评定铬元素含量的测量不确定度。分析各不确定度的分量,得出校准曲线和标准样品的均匀性对测量不确定度影响最大的结论,为今后仪器操作者如何提高检测准确性提供理论参考。

On the basis of JJF1059-1999 evaluation and expression of uncertainty in measurement,using vacuum direct reading spectrometer for determination of chemical composition content in stainless steel food containers,with Cr element as an example,through the establishment of the mathematical model,the measurement uncertainty of chromium content was evaluated from six factors including man,machine,material,method,central,back analysis.Analyzing the uncertainty components,a calibration curve and standard sample homogeneity of uncertainty in measurement for influential conclusion were drawn.It can provide the theory reference for future equipment operators how to improve the accuracy of testing.