石墨炉原子吸收光谱法测定化妆品中铅含量的测量不确定度评定

Evaluation of Uncertainty in Determination of Lead in Cosmetics by Graphite Furnace Atomic Absorption Spectrometry

采用石墨炉原子吸收光谱法分析化妆品中铅含量的测定过程,通过创建数学模型并按照测量不确定度评定的通用规则,分析影响测量不确定度的主要来源,计算测量过程中样品称量、消解、定容体积、测定过程的溶液配制、曲线拟合和仪器设备的重复性等主要影响不确定度的分量,得出合成不确定度和相对扩展不确定度,达到对其测量不确定度合理评定的目的。

This paper analyses the process of determination of lead content in cosmetics by graphite furnace atomic absorption spectrometry, by creating a mathematical model and measured in accordance with the general rule of uncertainty evaluation, analysis of the impact of the major sources of uncertainty, the main effect of repetitive calculation in the process of measuring solution sample weighing, digestion, determination process, volume the preparation, curve fitting and equipment uncertainty components, the combined uncertainty and expanded uncertainty, the uncertainty of measurement to achieve reasonable evaluation purpose.