Uncertainty evaluation for the determination of magnesium content in rare earth magnesium ferrosilicon alloy by inductively coupled plasma emission spectrometry
In this paper,the uncertainty of determination of magnesium in rare earth magnesium ferrosilicon alloy by inductively coupled plasma emission spectrometry is evaluated.According to the detection method and mathematical model,the source of uncertainty was analyzed from the aspects of reference material,calibration fitting curve,sample weighing,constant volume,dilution and repeated determination,and the corresponding relative standard uncertainty was calculated.The components are synthesized and expanded.It is calculated that the extended uncertainty is 0.19%(95%confidence interval,including factor k=2)when the content of Mg in rare-earth magnesium ferrosilicon alloy is 7.12%.The evaluation results show that the standard solution configuration process,repeatability measurement,calibration curve fitting and sample solution dilution process have obvious influence on the measurement results.
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