ICP-AES法测定离子型混合稀土氧化物中Al_2O_3量不确定度的评定

Evaluation of Uncertainty for the Determination of Aluminum Oxide Content in Mixed Rare Earth Oxide of Ion-absorpted Type RE ore by Inductively Coupled Plasma-Atomic Emission Spectroscopy

检测方法的不确定度评定对方法可靠性的评估具有重要的参考价值,也是检测机构需要加强和完善的一项基础工作。对ICP-AES法测定离子型混合稀土氧化物中Al_2O_3量的不确定度进行了分析评定,探讨了测量中不确定度的来源,并对各不确定度进行了量化计算,结果表明:该方法中测量结果的不确定度主要来源为曲线拟合与测量重复性,所测样品中Al_2O_3量检测结果为0.875%,扩展不确定度为0.065%,为检测机构质量控制提供了参考依据。

Evaluation of the measurement uncertainty is a foundation work need to be optimized in testing institution, it provides an important reference for the reliability of a measurement method. In the paper, the measurement uncertainty for the Determination of aluminum oxide content in mixed Rare Earth Oxide of lon-absorpted type RE ore by Inductively Coupled Plasma-Atomic Emission Spectroscopy was analyzed and evaluated. The main sources of uncertainly were discussed and their value were calculated. It can be concluded that the uncertainly components introduced by drawing the standard curve and testing repeatability have significant influence on measurement results. The measurement result of aluminum oxide content in sample was 0.875 %, the expanded uncertainly was 0.065 %. This will be a reference of quality control for testing institution.