火焰原子吸收分光光度法测定锂含量的不确定度评定  

Uncertainty Evaluation on Determining Lithium by Flame A tomic Absorption Spectrophotometry

作　　者：朱礼兵 龚明 兰书元 胡江峰 李红妮 Zhu Libing;Gong Ming;Lan Shuyuan;Hu Jiangfeng;Li Hongni(Quality Supervision and Inspection of Building and Sanitary Ceramics of Jiangxi Province,Jiangxi,Gao'an,330800,China;Jiangxi Building Ceramic Industry Technology Research Co.Ltd,Jiangxi,Gao'an,330800,China)

机构地区：[1]江西省建筑卫生陶瓷质量监督检验中心,江西高安300800 [2]江西建陶产业技术研究有限公司,江西高安330800

出　　处：《陶瓷》2023年第9期33-36,共4页Ceramics

摘　　要：笔者利用火焰原子吸收分光光度法测定锂含量,并对其测量不确定度进行评估。通过合理地建立数学模型,详细分析不确定主要来源,对测量重复性、锂标准溶液、标准溶液稀释、样品溶液中锂浓度、样品质量称量引入的测量不确定度分量进行评定,并计算合成标准不确定度和扩展不确定度。根据量化结果可知:标准曲线线性回归方程和测量重复性对不确定度影响最大。在测量过程中,可通过提高标准曲线的可靠性和相关性,并适当增加平行测定次数,来降低测量不确定度。Lithium content is determined by flame atomic absorption spectrophotometry,and the measurement uncertainty is evaluated.By establishing a reasonable mathematical model,the main sources of uncertainty are analyzed in detail;The measurement uncertainty components introduced by the measurement repeatability,lithium standard solution,standard so-lution dilution,lithium concentration in sample solution,and sample quality weighing are evaluated;The combined stand-ard uncertainty and expanded uncertainty are calculated.According to the quantitative results,the linear regression equation of standard curve and the measurement repeatability affect the uncertainty most.In the measurement process,the measure-ment uncertainty can be reduced by improving the reliability and correlation of the standard curve,and increasing the num-ber of parallel measurements appropriately.

关 键 词：火焰原子吸收分光光度法 锂含量 不确定度 线性回归方程 测量重复性 

分 类 号：TQ174.18[化学工程—陶瓷工业]