原子荧光光谱法测定煤中锗含量的不确定度评估

Uncertainty evaluation of Ge content in coal determined by AFS

论述了氢化物原子荧光光度法测定煤中锗含量的测定过程和数学模型,并分析各分量不确定度的来源;结果表明,原子荧光法测定煤中锗的不确定度主要引入来源分别为工作曲线拟合、方法回收率和样品重复测定;其中工作曲线拟合引入不确定度最大,当煤中锗含量为10.28μg/g时,合成标准不确定度为0.302 6μg/g,扩展不确定度为0.605 2μg/g(k=2)。

The analysis of the measurement process and mathematical model for determining germanium content in coal using the hydride generation atomic fluorescence spectrometry(HG-AFS)method involves an examination of the sources of uncertainty for each component.The results indicate that the major sources of uncertainty in the measurement of germanium in coal by AFS are primarily attributed to the following aspects:fitting of the working curve,method recovery rate,and repeated sample measurements.Among these,the fitting of the working curve contributes the largest portion of uncertainty.When the germanium content in coal is 10.28μg/g,the combined standard uncertainty is calculated to be 0.3026μg/g,with an expanded uncertainty of 0.6052μg/g(k=2).