石墨炉原子吸收光谱法测定芦蒿样品中镉的不确定度评定

通过石墨炉原子吸收光谱法重复测定芦蒿样品中的Cd，建立不确定度评定数学模型，系统分析和量化不确定度各分量。分析了测量过程中的不确定度主要来源于标准物质引入的不确定度、样品制备的不确定度、曲线拟合中产生的不确定度以及重复试验的不确定度。当Cd平均含量为0．20μg／g时，评定其不确定度为0．024μg／g。

Uncertainty evaluation of cadmium determination in celery wormwood by graphite furnace atomic absorption spectrometry

Through a repeated measurement of cadmium uncertainty in celery wormwood samples by graphite furnace atomic absorption spectrometry,the authors set up a mathematic model of uncertainty evaluation,analyzed and estimated systematically each of the portion of the uncertainty,analyzed the varied uncertainties from the sub-uncertainty of standard reference materials,sample preparation,and uncertainty caused by calibration curve fitting and repetitive tests.When average concentration of Cd in samples reached 0.20...