石墨炉原子吸收光谱法测定味精中痕量铅的不确定度评定  

Uncertainty Evaluation of Determination Results for Trace Lead in Monosodium Glutamate by Graphite Furnace Atomic Absorption Spectrometry

作　　者：王玉功[1] 李国兵 拉毛吉[1] 王建波[1] 

机构地区：[1]国土资源部兰州矿产资源监督检验中心,甘肃兰州730050 [2]湖南省地球物理地球化学勘查研究所,湖南邵阳422002

出　　处：《岩矿测试》2009年第2期165-168,共4页Rock and Mineral Analysis

摘　　要：以石墨炉原子吸收光谱法测定味精中痕量铅为例,对测定结果的不确定度来源进行分析,对测定过程的主要不确定度分量进行合理评定,包括称量不确定度、体积不确定度、曲线拟合不确定度及测量重复性引入的不确定度。评估了铅含量的合成标准不确定度和扩展不确定度。对于铅含量为0.025×10-6的味精样品,其扩展不确定度为0.002×10-6。The uncertainty measurement of the trace Pb in monosodium glutamate samples by graphite furnace atomic absorption spectrometry （GFAAS） was evaluated in this paper. The results showed that the main sources of the total uncertainty came from the fraction uncertainties of sample weighting, calibration curve fitting, the certified values of standard reference materials, the instrument stability and etc.. The total uncertainty for the determination of lead by GFAAS was combined and the expanding uncertainty was calculated with value of 0.002×10^-6 for the monosodium glutamate sample with lead content of 0.025×10^-6.

关 键 词：不确定度评定 石墨炉原子吸收光谱法 痕量铅 味精 

分 类 号：O213.1[理学—概率论与数理统计] O657.31[理学—数学]