FAAS测定陶瓷结合剂中氧化锂含量的不确定度

摘要

火焰原子吸收光谱法(FAAS)可测定陶瓷结合剂中氧化锂含量.为提高测量精度,进行FAAS的不确定度的评定实践,并分析测量重复性、标准曲线线性回归、试样溶液体积及称量等因素引起的不确定分量.按照国际通用方法计算合成不确定度和扩展不确定度.结果表明:测量重复性和标准曲线线性回归方程是不确定度的主要来源.在测定中应进行多次平行实验,并特别注意绘制标准曲线时所用标液浓度的合理选择.%FAAS , which is short for flame atomic absorption spectrometry , is a method widely used to assess Li2 O3 content in vitrified bond . To improve the accuracy , comparative tests were implemented to study the uncertainty caused by test repeatability , linear regression of standard curve , liquid volume , dilution degree and sample weighing . The combined uncertainty and expanded uncertainty was calculated based on an international method . Results show that test repeatability and linear regression of standard curve affect the uncertainty most . In conclusion , w hen determining the content , parallel repetitive measurement should be conducted with special attention paid to solution concentrations w hen drawing a standard curve .