分光光度法测定地质样品中Mo的不确定度评定

张激光

计量学报 ›› 2013, Vol. 34 ›› Issue (2) : 196-200.

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计量学报 ›› 2013, Vol. 34 ›› Issue (2) : 196-200. DOI: 10.3969/j.issn.1000-1158.2013.02.20

分光光度法测定地质样品中Mo的不确定度评定

  • 张激光
作者信息 +

Uncertainty Evaluation for the Determination of Mo in Geological Samples by Spectrophotometr

  • ZHANG Ji-guang
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摘要

通过对分光光度法测定地质样品中钼元素质量比全过程分析,确定了测定结果不确定度的来源并加以评定。采用最小二乘法对标准曲线进行线性回归,通过对2个不同质量分数样品的不确定度评定,证明样品的重复性测定和标准曲线拟合引入的不确定度为总不确定度的主要贡献者,且样品Mo质量分数越低,其相对不确定度越大,这与实验室中的实际测定情况一致。

Abstract

The sources of measurement uncertainty for the analytical results of Mo content in geological samples by spectrophotometry is determined and sub-uncertainties of the analytical results are evaluated through studying the whole process of the analytical results. With the least square method,the calibration curve is fitted. Through the evaluation of the analytical results of various contents of two samples, the sub-uncertainties from the sample repeated measures and the fitting of the calibration curve are the major contributor to the expanded uncertainty. And it shows that the lower the concentrations of Mo, the greater the relative standard uncertainty of analytical results.

关键词

计量学 / 地质样品 / / 分光光度法 / 不确定度评定 / 线性回归

Key words

Metrology / Geological samples / Molybdenum / Spectrophotometry / Uncertainty evalution / Linear regression

引用本文

导出引用
张激光. 分光光度法测定地质样品中Mo的不确定度评定[J]. 计量学报. 2013, 34(2): 196-200 https://doi.org/10.3969/j.issn.1000-1158.2013.02.20
ZHANG Ji-guang. Uncertainty Evaluation for the Determination of Mo in Geological Samples by Spectrophotometr[J]. Acta Metrologica Sinica. 2013, 34(2): 196-200 https://doi.org/10.3969/j.issn.1000-1158.2013.02.20

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