原子吸收光谱法测定铍中铜含量的不确定度评定-中国材料进展

文章信息/Info

Title:: Evaluation of Uncertainty in Determination of Copper in Beryllium by Atomic Absorption Spectroscopy

Author(s):: WANG Jiali; BAI Yingli; SUN Hongtao; (State Key Laboratory of Special Rare Metal Materials, Northwest Rare Metal Materials Research Institute Ningxia Co., Ltd., Shizuishan 753000, China)

Keywords:: atomic absorption spectroscopy; beryllium; copper; measurement uncertainty

摘要:: 采用原子吸收光谱法对铍中铜元素含量进行测定，分析了影响测量不确定度的主要因素，通过建立测量过程中各分量不确定度评价的数学模型，对试料称量、溶解、萃取、标准溶液配制、工作曲线拟合、样品重复性测量等影响不确定度的分量进行分析，最终合成得到了测量结果的扩展不确定度。结果表明，样品重复性测量、工作曲线拟合是影响原子吸收光谱法不确定度的主要因素，从而为采用原子吸收光谱法测定铍中铜含量的检测质量控制提供理论基础。

Abstract:: The content of copper element in beryllium is measured by atomic absorption spectroscopy, the main sources that affect the uncertainty of measurement are analyzed, by establishing a mathematical model of each component in the measurement process. Uncertainty components including the sample weighing, dissolution, extraction, preparation of standard solution, work curve fitting and sample repeat determination are analyzed, the expanded uncertainty is got. The results show that the sample repeat determination and work curve are the main factors affecting the uncertainty of the method, which provides a theoretical basis for the determination quality control of copper content in beryllium by atomic absorption spectroscopy method.