便携式XRF测定齿轮油中金属元素的不确定度评定

Evaluation of Uncertainty in Determination of Metal Elements in Gear Oil by Portable XRF

本文介绍了使用便携式能量色散X荧光光谱仪(XRF)测定齿轮油中金属元素的方法,基于测量不确定度评定要求,以铁元素为例,对整个实验过程可能引入的不确定度的各个环节进行分析,确定了测量不确定的来源:重复性实验、标准工作溶液和测试设备自身。通过实验,确定齿轮油中铁元素为115.27g/g,扩展不确定度为4.82g/g,其中包含因子K=2,置信水平为95%。

This paper introduces the method of using portable energy dispersive X-ray fluorescence spectrometer(XRF)to determine metal elements in gear oil.Based on the evaluation requirements of measurement uncertainty,taking iron as an example,each link of uncertainty that may be introduced in the whole experiment process is analyzed,and the source of measurement uncertainty is determined:repeatability experiment,standard working solution and test equipment itself.Through experiments,it is determined that the iron element in gear oil is 115.27μg/g.When the confidence level of coverage factor K=2 is 95%,the expanded uncertainty is 4.82μg/g.