NORDTEST不确定度评定在熔融制样-X射线

报道了NORDTEST不确定度评定在熔融制样 X射线荧光光谱法测定岩石样品中10种主次成分（氧化钠、氧化镁、三氧化二铝、二氧化硅、五氧化二磷、氧化钾、氧化钙、二氧化钛、氧化锰和三氧化二铁)分析结果中的应用。依据NORDTEST规则, 对3个国家一级标准物质GBW07104、GBW07105和GBW07106进行10个组分分析结果不确定度的评估。发现具有明显浓度梯度的二氧化硅的浓度与求得的相对不确定度具有很好的相关性, 相关系数R²=0.953 9。单个标准物质与3个标准物质求出的相对不确定度, 除了低含量组分的差别较大外, 其余组分的不确定度结果接近。

The application of NORDTEST uncertainty evaluation to the determination of ten major and minor components in rocks by X-ray fluorescence spectrometry with fusion sample preparation

The application of NORDTEST uncertainty evaluation to the determination results of 10 major and minor components (including Na₂O, MgO, Al₂O₃, SiO₂, P₂O₅, K₂O, CaO, TiO₂, MnO and Fe₂O₃) in rock samples by X-ray fluorescence spectrometry with fusion sample preparation was reported. According to the NORDTEST rules, the uncertainty of the determination results of 10 components in 3 national Grade One certified reference materials, namely, GBW07104, GBW07105 and GBW07106, was assessed. It was found that the concentration of SiO₂ with noticeable concentration gradients have good correlation with the obtained relative uncertainty values, and the correlation coefficient （R²）was 0.953 9. The relative uncertainty obtained between a single certified reference material and 3 certified reference materials had comparatively large discrepancy for the low content components and similar uncertainty results for the other components.