氢化物发生-原子荧光光谱法测定锰矿中砷结果的不确定度评定

来源期刊：冶金分析2011年第4期

论文作者：刘文甫 应文河

文章页码：77 - 80

关键词：氢化物发生-原子荧光光谱法； 不确定度评定； 锰矿； 砷

Key words：hydride generation-atomic fluorescence spectrometry； uncertainty evaluation； manganese ore； arsenic

摘    要：对氢化物发生-原子荧光光谱法测定锰矿中砷含量的不确定度来源进行分析,表明不确定度主要来源于样品称量过程、待测溶液定容体积、标准溶液配制、校准曲线拟合以及待测溶液重复测量。通过对各分量的不确定度评定,得到合成标准不确定度,在此基础上将合成标准不确定度乘以95%置信度下的扩展因子2,得到扩展不确定度,最后给出了含有扩展不确定度的砷测定结果。

Abstract: The uncertainty sources in the determination of arsenic in manganese ore by hydride generation-atomic fluorescence spectrometry were discussed.The results indicated that the uncertainty was mainly from the weighing of sample,dilution volume of testing solution,preparation of standard solution,calibration curve fitting and measurement repeatability of testing solution.Through evaluating the components of uncertainty,the combined standard uncertainty was obtained.The expanded uncertainty was obtained by multiplying the combined standard uncertainty by expanded factor(2) under the confidence level of 95%.Finally,the determination results of arsenic containing expanded uncertainty were provided.