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[目的]研究建立多元素总量检测时的测量不确定度的评估程序。[方法]采用电感耦合等离子质谱法同时检测茶叶中16种稀土元素,以计量检定规程《测量不确定度评定与表示》为依据,建立数学模型,分析其不确定度的主要来源。通过对测量过程中不确定度分量进行分析和合成,计算出茶叶中稀土氧化物A类、B类不确定度及包含因子,进一步算出稀土氧化物总量的扩展不确定度。[结果]通过计算测量过程中的A类、B类不确定度和自由度,从JJF1059-1999技术规范的附录A中查出包含因子K,计算出扩展不确定度U,说明了多元素总量检测时测量不确定度的评估程序。[结论]该方法可以用来评估多元素总量检测的不确定度。
[Objective] The research aimed to study the procedure for establishing the measurement uncertainty of multi-element total detection. [Method] The determination of 16 rare earth elements in tea by inductively coupled plasma mass spectrometry (GC-ICP-MS) was carried out. Based on the procedure of “Measurement Uncertainty Evaluation and Expression”, a mathematical model was established and its main sources of uncertainty were analyzed. Based on the analysis and synthesis of the uncertainty components in the measurement process, the uncertainties and inclusion factors of rare earth oxides A and B in tea leaves were calculated and the extended uncertainty of total rare earth oxides was further calculated. [Result] The included factor K was found from appendix A of JJF1059-1999 technical specification by calculating the uncertainty of class A and class B and degree of freedom in the measurement process, and the extended uncertainty U was calculated. Measurement procedures to measure the uncertainty of the assessment process. [Conclusion] This method can be used to evaluate the uncertainty of multi-element total detection.