摘要
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。
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. 20μg/ g, and its uncertainty was determined to be 0. 024μg/g.
出处
《地质学刊》
CAS
2009年第3期288-292,共5页
Journal of Geology
关键词
石墨炉原子吸收
芦蒿
镉
不确定度
评定
Graphite furnace atomic absorption
Celery wormwood
Cadmium
Uncertainty
Evaluation
