电感耦合等离子体质谱法测定水中铅的不确定度

Determination of Uncertainty of Lead in Water by Inductively Coupled Plasma Mass Spectrometry

评定电感耦合等离子体质谱仪测定水中铅的不确定度。依据测量不确定度评定与表示的理论,建立了检出限的测量结果不确定度评定的数学模型,分析了各相对标准不确定度分量,计算了合成标准不确定度和扩展不确定度。检出限测量结果不确定度报告为D L=0.0061 ng,U=0.0020 ng(k=2)。由标准不确定度分量值可以得出,电感耦合等离子体质谱仪检测水中铅检出限结果不确定度主要是标准曲线斜率引入的不确定度。

To evaluate the uncertainty of determination of lead in water by inductively coupled plasma mass spectrometer.On the basis of the theory of measurement uncertainty evaluation and expression,established the mathematical model of uncertainty evaluation of detection limit,analyzed the relative standard components,calculated the synthetic standard uncertainty and expanded uncertainty.Detection limit uncertainty of measurement results report Q L=0.0061 ng,U=0.0020 ng(k=2).From the standard uncertainty component,it can be concluded that the uncertainty of the detection limit of lead in water by Inductively coupled plasma is mainly caused by the slope of the standard curve.