1.1 本试验方法涵盖了制备和通过X射线荧光(XRF)分析含铀油和有机溶液所需的步骤。描述了两种不同的制备技术。 1.2 该程序适用于向光谱仪提供的铀质量密度为20 μ g/mL至2000 μ g/mL的有机溶液（用于溶液技术）和铀质量分数为200 μ g/g至50 000 μ g/g的颗粒（用于颗粒技术）。 1.3 该测试方法需要使用适当的内标。必须注意确定通过该试验方法分析的样品不含内标物，或者该污染物（无论何时存在）已被数学校正。本程序不涉及此类更正。必须注意内标和样品介质相容；也就是说，样品必须与三- n -磷酸丁酯（TBP），不得从溶液中除去内标。或者，可以使用散射线作为内标。 2 1.4 以SI单位表示的值应被视为标准。括号中给出的值仅供参考。 1.5 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 具体的预防声明见第节 9 和 附注2 . 1.6 本国际标准是根据世界贸易组织发布的关于制定国际标准、指南和建议的原则的决定中确立的国际公认的标准化原则制定的ade（TBT）委员会。 ======意义和用途====== 5.1 该测试方法适用于向光谱仪提供的含有20 μ g/mL至2000 μ g/mL铀的有机溶液，或使用熔融沉淀技术的含有200 μ g/g至50000 μ g/g铀的沉淀。 5.2 可以使用波长色散或能量色散XRF系统，前提是系统附带的软件能够适应内标的使用。

1.1 This test method covers the steps necessary for the preparation and analysis by X-ray fluorescence (XRF) of oils and organic solutions containing uranium. Two different preparation techniques are described. 1.2 The procedure is valid for organic solutions with uranium mass densities of 20 μg/mL to 2000 μg/mL as presented to the spectrometer for the solution technique and pellets with uranium mass fractions of 200 μg/g to 50 000 μg/g for the pellet technique. 1.3 This test method requires the use of an appropriate internal standard. Care must be taken to ascertain that samples analyzed by this test method do not contain the internal standard or that this contamination, whenever present, has been corrected for mathematically. Such corrections are not addressed in this procedure. Care must be taken that the internal standard and sample medium are compatible; that is, samples must be miscible with tri- n -butyl phosphate (TBP) and must not remove the internal standard from solution. Alternatively, a scatter line may be used as the internal standard. 2 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 9 and Note 2 . 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is applicable to organic solutions containing uranium at 20 μg/mL to 2000 μg/mL presented to the spectrometer for the solution techniques or pellets containing uranium at 200 μg/g to 50 000 μg/g using the fused pellet technique. 5.2 Either wavelength-dispersive or energy-dispersive XRF systems may be used, provided that the software accompanying the system is able to accommodate the use of internal standards.