Measurement uncertainty (MU) associated with the determination of the light rare earth elements (La, Ce, Pr, Nd, Sm, Eu), yttrium and uranium in different types of rock samples by an ICP-OES method has been evaluated by the three principal approaches: the GUM modelling approach, the Nordtest single laboratory approach and the Horwitz equation. A within-laboratory validation data for specificity, linearity, range, accuracy and precision was used for the MU calculations. Procedures have been described for the MU calculations by the three approaches and MU results for an in-house rock sample by the three approaches have been compared. MU results by the GUM approach were in good agreement with those obtained using the Horwitz equation, but were lower than those obtained by the Nordtest approach.

中文翻译：

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岩石样品中轻稀土元素、钇和铀的 ICP-OES 测定测量不确定度估计主要方法的比较研究

与使用 ICP-OES 方法测定不同类型岩石样品中的轻稀土元素（La、Ce、Pr、Nd、Sm、Eu）、钇和铀相关的测量不确定度 (MU) 已由三个机构评估主要方法：GUM 建模方法、Nordtest 单一实验室方法和 Horwitz 方程。MU 计算使用了实验室内的特异性、线性、范围、准确度和精密度验证数据。已经描述了三种方法的 MU 计算程序，并且比较了三种方法对内部岩石样本的 MU 结果。GUM 方法的 MU 结果与使用 Horwitz 方程获得的结果非常一致，但低于 Nordtest 方法获得的结果。